There are 1030 fish that start with the letter K, from Kabar Goby to Kyzylkum Stone Loach. Below you will find them listed alphabetically along with some general information about each. Click the toggle view buttons in the top right corner to switch between the card and the table view.
For each item you will find the following information
Order: The subclass the fish belongs to
Habitat: The places or type of weather the fish lives in
Scientific name: The designation that scientists use to catalog the species
Name: Kabar Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Odonteleotris macrodon
Name: Kabaragoya
Order: Perciformes
Habitat: Freshwater
Scientific name: Kabaragoya malabarica
Name: Kabaragoya Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius mahanadiensis
Name: Kabarore
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Labeobarbus Kabarore
Name: Kabompo Spinyfin
Order: Perciformes
Habitat: Freshwater
Scientific name: Acanthoperca kabompoensis
Name: Kabuki Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Ophiogobius melanosoma
Name: Kabuli Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kabuli
Name: Kachal Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kachalensis
Name: Kadaba Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius kadaba
Name: Kadana Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius kadnensis
Name: Kadipore Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius kadiporensis
Name: Kafa Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kafaensis
Name: Kafjord cod
Order: Gadiformes
Habitat: Marine
Scientific name: Gadus morhua
Name: Kafue Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius Kafuensis
Name: Kagami Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobiopsis kagami
Name: Kagan's Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius kaganensis
Name: Kagan's Cardinalfish
Order: Perciformes
Habitat: Marine
Scientific name: Apogon kaganensis
Name: Kagan's Moray
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax kagani
Name: Kager's Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kageri
Name: Kageru Tilapia
Order: Cichliformes
Habitat: Freshwater
Scientific name: Oreochromis kageruensis
Name: Kageyama's Moray
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax kageyamae
Name: Kagoshima Flathead
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Platycephalus kagoshimae
Name: Kagoshima Goby
Order: Gobiiformes
Habitat: Brackish/Freshwater
Scientific name: Gymnogobius Kagoshimensis
Name: Kagus
Order: Batrachoidiformes
Habitat: Marine
Scientific name: Opsanus Kagus
Name: Kaguya Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Sueviota kaguya
Name: Kahn's Tetra
Order: Characiformes
Habitat: Freshwater
Scientific name: Hyphessobrycon Kahnii
Name: Kaiawa Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Stonogobiops kaiawa
Name: Kaichika Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Hedinichthys kaiya
Name: Kaifu Skate
Order: Rajiformes
Habitat: Marine
Scientific name: Okamejei kaifunensis
Name: Kaiga Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius kaigaensis
Name: Kaikoura Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobionellus stomias
Name: Kailash Scraper
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Garra Kailash
Name: Kaili Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Chiramenu kaili
Name: Kailola's Sea Catfish
Order: Siluriformes
Habitat: Brackish
Scientific name: Arius kailolai
Name: Kaimaki Goby
Order: Perciformes
Habitat: Brackish
Scientific name: Gobius kaimakliensis
Name: Kaimana Hardyhead
Order: Atheriniformes
Habitat: Freshwater
Scientific name: Craterocephalus Kaimana
Name: Kaimosi Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Enteromius kaimosi
Name: Kaingaroa Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Pseudogobius Kaingaroa
Name: Kaiparathana
Order: Perciformes
Habitat: Marine
Scientific name: Kaiparathana Indicus
Name: Kaiping Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Paracobitis kaipingensis
Name: Kairaki
Order: Perciformes
Habitat: Marine
Scientific name: Kairakia labiata
Name: Kairezi River Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kairensis
Name: Kairouan Killifish
Order: Cypriniformes
Habitat: Freshwater/Brackish
Scientific name: Aphanius mento
Name: Kaiser Botia
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Botia kubotai
Name: Kaiser Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kottelati
Name: Kaiser Triggerfish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Balistes Kaiser
Name: Kaivalya Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Hypselobarbus kairali
Name: Kajang Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Barbodes kajangensis
Name: Kaji's Flathead
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Bembras kaji
Name: Kajika
Order: Scorpaeniformes
Habitat: Freshwater
Scientific name: Cottus reinii
Name: Kajiki
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Makaira mazara
Name: Kajikia albida
Order: Istiophoriformes
Habitat: Marine
Scientific name: Kajikia albida
Name: Kajimuri Catfish
Order: Siluriformes
Habitat: Freshwater
Scientific name: Ompok kajimuri
Name: Kakabain Cichlid
Order: Cichliformes
Habitat: Freshwater
Scientific name: Tilapia kakabensis
Name: Kakadu Hardyhead
Order: Atheriniformes
Habitat: Freshwater
Scientific name: Craterocephalus kakaduensis
Name: Kakamega Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kakamegensis
Name: Kakamouéké's Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kakamouekaensis
Name: Kakapo Perchlet
Order: Perciformes
Habitat: Freshwater
Scientific name: Percosoma kakapo
Name: Kakhovka Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Cobitis kakhovkaensis
Name: Kakinada Goby
Order: Gobiiformes
Habitat: Brackish
Scientific name: Mudskipper Kakinada
Name: Kakuna
Order: Siluriformes
Habitat: Freshwater
Scientific name: Mystus Kakuna
Name: Kala Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Pandaka kala
Name: Kalaa
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Arothron stellatus
Name: Kalabagan Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura notostigma
Name: Kalabakan Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius kalabakanensis
Name: Kalahari Cichlid
Order: Perciformes
Habitat: Freshwater
Scientific name: Serranochromis robustus
Name: Kalahari Kilifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius Kalahari
Name: Kalahari Tope
Order: Carcharhiniformes
Habitat: Marine
Scientific name: Carcharhinus obscurus
Name: Kalakad Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius kalakadensis
Name: Kalakad Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Kalakadensis
Name: Kalakadu Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius nangalensis
Name: Kalaloch Creek Lamprey
Order: Petromyzontiformes
Habitat: Freshwater
Scientific name: Lampetra richardsoni
Name: Kalam Fish
Order: Siluriformes
Habitat: Freshwater
Scientific name: Rita chrysea
Name: Kalamo
Order: Perciformes
Habitat: Freshwater
Scientific name: Kalamo kapi
Name: Kalao Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius Kalaoensis
Name: Kalao Damselfish
Order: Perciformes
Habitat: Marine
Scientific name: Pomacentrus kalao
Name: Kalau Goby
Order: Perciformes
Habitat: Marine
Scientific name: Gobiopsis kalau
Name: Kalbar Stonefish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Synanceia kalbari
Name: Kalemana Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Homaloptera Kalemana
Name: Kali Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Kali
Name: Kalibar Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius kalibarensis
Name: Kalimantan Archerfish
Order: Perciformes
Habitat: Brackish
Scientific name: Toxotes kampotensis
Name: Kalimantan Glass Catfish
Order: Siluriformes
Habitat: Freshwater
Scientific name: Kryptopterus macrocephalus
Name: Kalimantan Mudskipper
Order: Gobiiformes
Habitat: Brackish/Marine
Scientific name: Boleophthalmus Kalimantan
Name: Kalimantan Snakehead
Order: Perciformes
Habitat: Freshwater
Scientific name: Channa kalimantana
Name: Kalimpong Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura manipurensis
Name: Kalinga Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius kalimantanus
Name: Kalingan Labio
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Labio kalinganensis
Name: Kalinganadu Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Hypselobarbus kalus
Name: Kalk Bay Sandgoby
Order: Gobiiformes
Habitat: Marine
Scientific name: Monishia sandagayensis
Name: Kallaba Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Eugnathogobius kabilia
Name: Kallada Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Dawkinsia Kallada
Name: Kallada Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Aplocheilus Kallada
Name: Kallamkuzhy Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus pallidus
Name: Kallur Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius kallarensis
Name: Kalong Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kalongensis
Name: Kaloula Tetra
Order: Characiformes
Habitat: Freshwater
Scientific name: Hemigrammus Kaloula
Name: Kalpeni Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kalpanai
Name: Kalu Ganga Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura barmouth
Name: Kaludi Carp
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Labeo Kaludi
Name: Kaluga Sturgeon
Order: Acipenseriformes
Habitat: Freshwater/Brackish
Scientific name: Huso dauricus
Name: Kalukala
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax shaoi
Name: Kalumbe's Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Enteromius kalumbei
Name: Kalyanam's Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius Kalyanamensis
Name: Kamaka Goby
Order: Gobiiformes
Habitat: Freshwater/Brackish
Scientific name: Eleotris fusca
Name: Kamaka Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kamakakhyaensis
Name: Kamakura Goby
Order: Gobiiformes
Habitat: Brackish/Freshwater
Scientific name: Gymnogobius Kamakura
Name: Kamal's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kamali
Name: Kambara's Dragonet
Order: Perciformes
Habitat: Marine
Scientific name: Repomucenus kamabara
Name: Kambara's Goby
Order: Perciformes
Habitat: Marine
Scientific name: Fusigobius kamoharae
Name: Kambara's Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys kamoharae
Name: Kambara's Scorpionfish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Scorpaena karasou
Name: Kambara's Snake Eel
Order: Anguilliformes
Habitat: Marine
Scientific name: Ptymosudis kamoharae
Name: Kambara's Triplefin
Order: Perciformes
Habitat: Marine
Scientific name: Enneapterygius Kambara
Name: Kambarage Tilapia
Order: Cichliformes
Habitat: Freshwater
Scientific name: Oreochromis kambarage
Name: Kambarang Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius kambarang
Name: Kambaya Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kambayensis
Name: Kamboja Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kamboja
Name: Kamchatka Sculpin
Order: Scorpaeniformes
Habitat: Freshwater
Scientific name: Cottus kamchatkaensis
Name: Kamchatkan Flounder
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Atheresthes stomias
Name: Kamerun Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura reticulata
Name: Kameswari Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kameswarensis
Name: Kamihata's Sandperch
Order: Perciformes
Habitat: Marine
Scientific name: Parapercis kamihatai
Name: Kamilam Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobiodon okinawae
Name: Kamohara's Dragonet
Order: Perciformes
Habitat: Marine
Scientific name: Callionymus kamoharae
Name: Kamohara's Moray
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax kamoharae
Name: Kamohara's Skate
Order: Rajiformes
Habitat: Marine
Scientific name: Okamejei kamoharai
Name: Kamohara's Tonguefish
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Symphurus kamoharae
Name: Kampa Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kampaensis
Name: Kampong Catfish
Order: Siluriformes
Habitat: Freshwater
Scientific name: Clarias Kampongensis
Name: Kampong Speu Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kampucheensis
Name: Kampung Gourami
Order: Gouramiiformes
Habitat: Freshwater
Scientific name: Trichopodus trichopterus
Name: Kampung Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Pangio Kampung
Name: Kanaana Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobiopsis kanae
Name: Kanabai Goby
Order: Gobiiformes
Habitat: Freshwater/Brackish
Scientific name: Stigmatogobius romeri
Name: Kanade Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Vanderhorstia ambanoro
Name: Kanadi Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Stonogobiops kanadi
Name: Kanadi Grunt
Order: Perciformes
Habitat: Marine
Scientific name: Pomadasys kanadayi
Name: Kanadi Tonguefish
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Cynoglossus kanadensis
Name: Kanagasabapathy's Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius kanagae
Name: Kanak Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Amblyeleotris kanakarum
Name: Kanakan Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Amblyeleotris arcupinna
Name: Kanakana
Order: Anguilliformes
Habitat: Freshwater/Brackish
Scientific name: Anguilla dieffenbachii
Name: Kanamede Skate
Order: Rajiformes
Habitat: Marine
Scientific name: Okamejei kenojei
Name: Kanape Goby
Order: Gobiiformes
Habitat: Freshwater/Brackish
Scientific name: Stigmatogobius signifer
Name: Kanawha Darter
Order: Perciformes
Habitat: Freshwater
Scientific name: Etheostoma kanawhae
Name: Kanawha Minnow
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Phenacobius teretulus
Name: Kanchana Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius kanchana
Name: Kancheepuram Snakehead
Order: Anabantiformes
Habitat: Freshwater
Scientific name: Channa Kancheepuramensis
Name: Kanchenjunga Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Kanchenjungaensis
Name: Kanda Moray
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax kandanus
Name: Kandahar Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kandaharica
Name: Kandai Mudskipper
Order: Gobiiformes
Habitat: Brackish
Scientific name: Boleophthalmus dentata
Name: Kandak Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kandak
Name: Kandalakscha Cod
Order: Gadiformes
Habitat: Marine
Scientific name: Gadus morhua
Name: Kandangan Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kottelati
Name: Kandia Shark
Order: Carcharhiniformes
Habitat: Marine
Scientific name: Carcharhinus plumbeus
Name: Kandla Goby
Order: Gobiiformes
Habitat: Brackish/Marine
Scientific name: Acentrogobius gangata
Name: Kanduli
Order: Siluriformes
Habitat: Marine/Brackish
Scientific name: Arius thalassinus
Name: Kanduli Catfish
Order: Siluriformes
Habitat: Brackish
Scientific name: Arius nudiceps
Name: Kanebo Brotula
Order: Ophidiiformes
Habitat: Marine
Scientific name: Brotula Kanebo
Name: Kanehira's Anchovy
Order: Clupeiformes
Habitat: Marine
Scientific name: Thrissina kanehirae
Name: Kanekonia's Scorpionfish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Scorpaenopsis kanekonia
Name: Kangaroo Shark
Order: Carcharhiniformes
Habitat: Marine
Scientific name: Carcharhinus brachyurus
Name: Kangaroofish
Order: Aulopiformes
Habitat: Marine
Scientific name: Plesiobatis daviesi
Name: Kangavar Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kangavarana
Name: Kangean Cardinalfish
Order: Perciformes
Habitat: Marine
Scientific name: Apogon kangeanensis
Name: Kangean Snake Eel
Order: Anguilliformes
Habitat: Marine
Scientific name: Myrichthys kangeanensis
Name: Kanguru Bass
Order: Perciformes
Habitat: Marine
Scientific name: Cynoscion kanguru
Name: Kangyuan Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kangyuanensis
Name: Kani Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Cryptocentrus kanifushi
Name: Kani-fish
Order: Perciformes
Habitat: Freshwater
Scientific name: Lates mariae
Name: Kaniharu Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kaniyar
Name: Kaningi Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Enteromius kaningensis
Name: Kankey Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura naggujii
Name: Kanmalai Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kohatensis
Name: Kanniyakumari Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura robertsi
Name: Kano Mudfish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Clarias gariepinus
Name: Kanon Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Rhinogobius flumineus
Name: Kansai Halfbeak
Order: Beloniformes
Habitat: Marine
Scientific name: Hyporhamphus Kansainus
Name: Kansas Darter
Order: Perciformes
Habitat: Freshwater
Scientific name: Etheostoma cragini
Name: Kansu Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kansuensis
Name: Kanthi Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Kanthi
Name: Kanyakumari Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kanyakumariensis
Name: Kao's Goatfish
Order: Perciformes
Habitat: Marine
Scientific name: Upeneus kaohsiungensis
Name: Kao's Wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Cirrhilabrus kaonoi
Name: Kapala Grunt
Order: Perciformes
Habitat: Marine
Scientific name: Pomadasys kapala
Name: Kapala Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kapalaensis
Name: Kapenta
Order: Clupeiformes
Habitat: Freshwater
Scientific name: Limnothrissa miodon
Name: Kaper Catshark
Order: Carcharhiniformes
Habitat: Marine
Scientific name: Atelomycterus Kaper
Name: Kapoeta
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Garra ethelwynnae
Name: Kapuas Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Cyclocheilichthys armatus
Name: Kapuas Catfish
Order: Siluriformes
Habitat: Freshwater
Scientific name: Hemibagrus nemurus
Name: Kapuas Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Oligolepis kapuasensis
Name: Kapuas Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Pangio kapuasensis
Name: Kapuas River Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius kapuasensis
Name: Kapuas River Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Gnatholepis kapuasensis
Name: Kapuas River Tiger Perch
Order: Perciformes
Habitat: Freshwater
Scientific name: Datnioides undecimradiatus
Name: Kapuas Snakehead
Order: Perciformes
Habitat: Freshwater
Scientific name: Channa kapuasensis
Name: Kapuas Stingaree
Order: Myliobatiformes
Habitat: Freshwater
Scientific name: Urolophus Kapuasensis
Name: Kapulu Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Vanderhorstia kapulu
Name: Kara Sea Skate
Order: Rajiformes
Habitat: Marine
Scientific name: Amblyraja Karasensis
Name: Karabiner Snake Eel
Order: Anguilliformes
Habitat: Marine
Scientific name: Ophichthus karabini
Name: Karachi Halfbeak
Order: Beloniformes
Habitat: Marine
Scientific name: Hyporhamphus balinensis
Name: Karachi Tongue Sole
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Cynoglossus arel
Name: Karagan Trevally
Order: Carangiformes
Habitat: Marine
Scientific name: Carangoides praeustus
Name: Karai Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Karai
Name: Karaikal Goby
Order: Gobiiformes
Habitat: Brackish/Marine
Scientific name: Acentrogobius moloanus
Name: Karaikal Threadfin Bream
Order: Perciformes
Habitat: Marine
Scientific name: Nemipterus peronii
Name: Karakelong Rainbowfish
Order: Atheriniformes
Habitat: Freshwater
Scientific name: Melanotaenia Karakelong
Name: Karaman Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Luciobarbus karamanensis
Name: Karaman Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius Karamanus
Name: Karaman Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura karamanensis
Name: Karaman Stickleback
Order: Gasterosteiformes
Habitat: Freshwater
Scientific name: Gasterosteus karaman
Name: Karambola
Order: Perciformes
Habitat: Marine
Scientific name: Caranx tille
Name: Karamojo Cichlid
Order: Cichliformes
Habitat: Freshwater
Scientific name: Haplochromis karamojo
Name: Karamojong Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Labeo Karamojong
Name: Karanj Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Cryptocentrus Karanjensis
Name: Karanja
Order: Perciformes
Habitat: Marine
Scientific name: Acanthurus nigricans
Name: Karanje Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Karanje
Name: Karas
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Carassius carassius
Name: Karas Bluegill
Order: Perciformes
Habitat: Freshwater
Scientific name: Lepomis Karasensis
Name: Karasu Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Oxynoemacheilus karasuensis
Name: Karayar Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Karayar
Name: Kardass
Order: Perciformes
Habitat: Marine
Scientific name: Sciaena Umbrina
Name: Kareh Fish
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Capoeta trutta
Name: Karelin's Goby
Order: Perciformes
Habitat: Brackish
Scientific name: Pomatoschistus karelini
Name: Karena Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobiopsis karena
Name: Karenius Cichlid
Order: Cichliformes
Habitat: Freshwater
Scientific name: Thoracochromis karenius
Name: Karewada Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Discordipinna karewada
Name: Kargil Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kargilensis
Name: Kari Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schmidgea karii
Name: Kari's Anglerfish
Order: Lophiiformes
Habitat: Marine
Scientific name: Lophiodes karii
Name: Kari's Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Enteromius kariae
Name: Kariba Bream
Order: Perciformes
Habitat: Freshwater
Scientific name: Oreochromis mortimeri
Name: Kariba Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius karibaensis
Name: Kariba Sardine
Order: Clupeiformes
Habitat: Freshwater
Scientific name: Limnothrissa miodon
Name: Kariba Tigerfish
Order: Characiformes
Habitat: Freshwater
Scientific name: Hydrocynus vittatus
Name: Kariba Tilapia
Order: Cichliformes
Habitat: Freshwater
Scientific name: Oreochromis mortimeri
Name: Karimanjabi
Order: Perciformes
Habitat: Freshwater
Scientific name: Serranochromis macrocephalus
Name: Karimeen
Order: Perciformes
Habitat: Brackish/Freshwater
Scientific name: Etroplus suratensis
Name: Karimganj Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura alii
Name: Karimui Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Sicyopus karimui
Name: Karin Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura fasciata
Name: Karisia Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius karisiaensis
Name: Karisia Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura karisiaensis
Name: Kariya Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Yunnanilus kariya
Name: Karkala Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Karkalensis
Name: Karkaria Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius karkariaensis
Name: Karluk Flathead
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Platycephalus karlukae
Name: Karma Killerfish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius karma
Name: Karma Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Karma
Name: Karmali Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius Karmalis
Name: Karman's Cardinalfish
Order: Perciformes
Habitat: Marine
Scientific name: Apogon karmanae
Name: Karmayogi Scraper
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Garra Karmayogi
Name: Karnali Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura karnaliensis
Name: Karnali Snowtrout
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schizothorax Karnaliensis
Name: Karnatak Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius karnatakensis
Name: Karnataka Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius sahyadriensis
Name: Karnataki Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Homaloptera santhamalia
Name: Karp
Order: Cypriniformes
Habitat: Freshwater lakes and rivers worldwide
Scientific name: Cyprinus carpio
Name: Karpa Char
Order: Salmoniformes
Habitat: Freshwater
Scientific name: Salvelinus malma krascheninnikova
Name: Karpathos Barbel
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Squalius malacostoma
Name: Karpov's Skate
Order: Rajiformes
Habitat: Marine
Scientific name: Bathyraja Karpovi
Name: Kartabo Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Sicydium kartabo
Name: Kartscher's Catshark
Order: Carcharhiniformes
Habitat: Marine
Scientific name: Parmaturus kartscheri
Name: Karu River Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius karuchensis
Name: Karubian Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobiodon karubiarum
Name: Karumba Goby
Order: Gobiiformes
Habitat: Brackish
Scientific name: Redigobius karumba
Name: Karun Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Luciobarbus karunensis
Name: Karun Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Karunensis
Name: Karun River Trout
Order: Salmoniformes
Habitat: Freshwater
Scientific name: Salmo Karuni
Name: Karun Tilapia
Order: Cichliformes
Habitat: Freshwater
Scientific name: Tilapia Karunensis
Name: Karwar Goby
Order: Gobiiformes
Habitat: Brackish/Freshwater
Scientific name: Stigmatogobius Karwarensis
Name: Kasai Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Hypsopanchax katolo
Name: Kasai Mouthbrooder
Order: Perciformes
Habitat: Freshwater
Scientific name: Tylochromis kasai
Name: Kashgar Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa stoliczkai
Name: Kashinath's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kashinathii
Name: Kashiwazaki Scad
Order: Carangiformes
Habitat: Marine
Scientific name: Decapterus Kashiwazakii
Name: Kashiwazaki Scorpionfish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Plectrogenium kanaya
Name: Kashmir Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kashmirensis
Name: Kasigau Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kasigauensis
Name: Kasilao Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Pangio Kasilaoensis
Name: Kasim Scraper
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Garra Kasim
Name: Kasio Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius koumansi
Name: Kassala Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kassalaensis
Name: Kassala Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kassalensis
Name: Kassang River Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Stenogobius kassangensis
Name: Kasseler Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Cobitis kasseleri
Name: Kasu Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kasuensis
Name: Kasumiga Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Rhinogobius katsuyamae
Name: Kat River Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Enteromius capensis
Name: Kat River Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius katrivensis
Name: Kata Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Obliquogobius kata
Name: Kataja Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kataja
Name: Katakuchi Iwashi
Order: Clupeiformes
Habitat: Marine
Scientific name: Engraulis japonicus
Name: Katakuchi-Iwashi
Order: Clupeiformes
Habitat: Marine
Scientific name: Engraulis Japonica
Name: Katala
Order: Perciformes
Habitat: Freshwater
Scientific name: Lates microlepis
Name: Katala Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura katala
Name: Katanga Happy
Order: Perciformes
Habitat: Freshwater
Scientific name: Haplochromis katangae
Name: Katanga Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura katangaensis
Name: Katawa
Order: Perciformes
Habitat: Freshwater
Scientific name: Lates mariae
Name: Katha Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Katha
Name: Kathar Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura katha
Name: Kathar's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Oxyurichthys kathar
Name: Kathleena's Sweeper
Order: Perciformes
Habitat: Marine
Scientific name: Pempheris kathleenae
Name: Kati
Order: Perciformes
Habitat: Marine
Scientific name: Caranx ignobilis
Name: Katihar Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura katiharensis
Name: Katka Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Katkaensis
Name: Katla
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Catla catla
Name: Katong Goby
Order: Gobiiformes
Habitat: Brackish/Marine
Scientific name: Gobiopterus chuno
Name: Katpadi Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus olivaceus
Name: Katsala Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius katsalae
Name: Katsue's Cardinalfish
Order: Perciformes
Habitat: Marine
Scientific name: Apogon Katsui
Name: Katsuo
Order: Scombriformes
Habitat: Marine
Scientific name: Katsuwonus pelamis
Name: Katsura Goby
Order: Perciformes
Habitat: Freshwater
Scientific name: Rhinogobius katsurae
Name: Katsura River Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rhinogobius katsurae
Name: Katsura Scad
Order: Carangiformes
Habitat: Marine
Scientific name: Trachurus Katsurai
Name: Katsuwonus pelamis
Order: Scombriformes
Habitat: Marine
Scientific name: Katsuwonus pelamis
Name: Katwal Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura katwali
Name: Katyper Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa katyper
Name: Kaua'i Brotula
Order: Ophidiiformes
Habitat: Marine
Scientific name: Brotula kaufmanni
Name: Kauffman's Shark
Order: Carcharhiniformes
Habitat: Marine
Scientific name: Carcharhinus galapagensis
Name: Kaufmann's Goby
Order: Perciformes
Habitat: Marine
Scientific name: Gobius kaufmanni
Name: Kaufmann's Wormfish
Order: Gobiiformes
Habitat: Marine
Scientific name: Paragunnellichthys kaufmanni
Name: Kaup's Mullet
Order: Mugiliformes
Habitat: Marine
Scientific name: Mugil kaupuensis
Name: Kauzmann Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Amblygobius pholegandros
Name: Kavali
Order: Perciformes
Habitat: Freshwater
Scientific name: Lates mariae
Name: Kavali Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Kavaliensis
Name: Kavango Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kavangoensis
Name: Kavikali Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kavikali
Name: Kavirondo Haplo
Order: Perciformes
Habitat: Freshwater
Scientific name: Haplochromis kavirondoensis
Name: Kawai's Gurnard
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Pterygotrigla Kawai
Name: Kawaka Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kawakaensis
Name: Kawakawa
Order: Scombriformes
Habitat: Tropical and subtropical Indo-Pacific oceans
Scientific name: Euthynnus affinis
Name: Kawali Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobiopsis bravoi
Name: Kawama Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kawamaensis
Name: Kawamukai Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rhinogobius kawamurai
Name: Kawanga Tilapia
Order: Cichliformes
Habitat: Freshwater
Scientific name: Oreochromis kawangazi
Name: Kawanishi's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Callogobius Kawanishii
Name: Kawara Goby
Order: Gobiiformes
Habitat: Brackish/Marine
Scientific name: Acentrogobius viridipunctatus
Name: Kawari Barbel
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Barbus barbus
Name: Kawasaki's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Trimmatom Kawasakii
Name: Kawase's Goby
Order: Perciformes
Habitat: Freshwater
Scientific name: Rhinogobius kawasumii
Name: Kawase's Surgeonfish
Order: Acanthuriformes
Habitat: Marine
Scientific name: Acanthurus Kawasei
Name: Kawashiri's Triplefin Blenny
Order: Perciformes
Habitat: Marine
Scientific name: Enneapterygius kawasushii
Name: Kaya Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kayah
Name: Kayah Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kayah
Name: Kayama's Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Entomacrodus Kayamae
Name: Kayangel Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Eviota Kayangelensis
Name: Kayar Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Coryogalops kayar
Name: Kayar Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Kayarensis
Name: Kaye's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Priolepis kayae
Name: Kayla's Dragonet
Order: Perciformes
Habitat: Marine
Scientific name: Synchiropus Kaylae
Name: Kazakh Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kaznakowi
Name: Kazakh Sturgeon
Order: Acipenseriformes
Habitat: Freshwater/Brackish
Scientific name: Acipenser nudiventris
Name: Kazakhstani Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kazakhstanica
Name: Kazamba Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Kazambica
Name: Kazan Cod
Order: Gadiformes
Habitat: Marine
Scientific name: Gadus morhua
Name: Kazenga Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kazengaensis
Name: Kaznakov's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius Kaznakovi
Name: Kbira Shark
Order: Carcharhiniformes
Habitat: Marine
Scientific name: Carcharhinus maou
Name: Kea Chromis
Order: Perciformes
Habitat: Marine
Scientific name: Chromis kea
Name: Kea Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Eviota Kea
Name: Keay's Dragonet
Order: Perciformes
Habitat: Marine
Scientific name: Synchiropus keayi
Name: Kebang Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Kebangensis
Name: Kedian Carp
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Procypris Kedianensis
Name: Kedong's Glassfish
Order: Perciformes
Habitat: Freshwater
Scientific name: Chanda Kedongi
Name: Keel-bellied Sardine
Order: Clupeiformes
Habitat: Marine
Scientific name: Ethmalosa fimbriata
Name: Keel-scaled Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys ocellatus
Name: Keeling Triggerfish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Sufflamen bursa
Name: Keelung Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Sicyopus discordipinnis
Name: Keelung Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Formosania keelungensis
Name: Keen's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobulus crescentalis
Name: Keen's Perchlet
Order: Perciformes
Habitat: Marine
Scientific name: Ambassis keeni
Name: Keene's Moray
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax keenei
Name: Keer's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura rupecula
Name: Keewee
Order: Perciformes
Habitat: Marine
Scientific name: Pristigenys Keewee
Name: Kei Archerfish
Order: Perciformes
Habitat: Freshwater/Brackish
Scientific name: Toxotes lorentzi
Name: Kei Cardinalfish
Order: Perciformes
Habitat: Marine
Scientific name: Apogon keiensis
Name: Kei Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys keiensis
Name: Kei Searobin
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Satyrichthys keiensis
Name: Keikai Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura keikai
Name: Keiko's Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Omobranchus Keikoae
Name: Keilback Minnow
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Hemiculter leucisculus
Name: Keiser's Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius Keiseri
Name: Keith's pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys keithi
Name: Kekekia
Order: Perciformes
Habitat: Marine
Scientific name: Kekekia Scleropterygius
Name: Kekuta Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kekutana
Name: Kelaart's Moray
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax kelaartii
Name: Kelantan Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kottelati
Name: Kelantan Snapper
Order: Perciformes
Habitat: Marine
Scientific name: Lutjanus kelantanensis
Name: Kelat River Catfish
Order: Siluriformes
Habitat: Freshwater
Scientific name: Glyptothorax Kelat
Name: Kelberi Peacock Bass
Order: Cichliformes
Habitat: Freshwater
Scientific name: Cichla kelberi
Name: Kelei Shark
Order: Carcharhiniformes
Habitat: Marine
Scientific name: Carcharhinus cautus
Name: Kelema Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kelemaensis
Name: Kelenk Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Kelenk
Name: Keletu Cichlid
Order: Cichliformes
Habitat: Freshwater
Scientific name: Ptychochromis keletu
Name: Kelle's Brotula
Order: Ophidiiformes
Habitat: Marine
Scientific name: Brotula kelleyi
Name: Keller's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius kelleri
Name: Kellogg's Porgy
Order: Spariformes
Habitat: Marine
Scientific name: Calamus Kelloggii
Name: Kelly's Goby
Order: Perciformes
Habitat: Marine
Scientific name: Gobiodon kelleyi
Name: Kelly's Wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Halichoeres Kellyi
Name: Kelp Bass
Order: Perciformes
Habitat: Kelp forests along the California coast
Scientific name: Paralabrax clathratus
Name: Kelpfish
Order: Perciformes
Habitat: Marine
Scientific name: Heterostichus rostratus
Name: Kelung's Snapper
Order: Perciformes
Habitat: Marine
Scientific name: Lutjanus kasmira
Name: Kemaman Halfbeak
Order: Beloniformes
Habitat: Brackish/Marine
Scientific name: Zenarchopterus Kemamanensis
Name: Kemaman Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kemamanensis
Name: Kemp's Catfish
Order: Siluriformes
Habitat: Freshwater
Scientific name: Mystus menoni
Name: Kemp's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius kempingi
Name: Kempana Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius campbelli
Name: Kempsell's Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Labeo Kempselli
Name: Kenana Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Kenanaensis
Name: Kendal's Moray
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax kendalli
Name: Kendall's Flashlight Fish
Order: Anomalopiformes
Habitat: Marine
Scientific name: Anomalops katoptron
Name: Kendall's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobulus kendalli
Name: Kendall's Searobin
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Prionotus Kendallii
Name: Kendari Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kendari
Name: Kendu-Kenduri Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kendurik
Name: Keng's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Lefua kengii
Name: Kenga Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Kengaensis
Name: Kengcheng Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kengchengensis
Name: Kenkatakuchi
Order: Clupeiformes
Habitat: Marine
Scientific name: Engraulis Kenkatakuchi
Name: Kennicott's Sculpin
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Myoxocephalus Kennicottii
Name: Kensakou-Iwashi
Order: Clupeiformes
Habitat: Marine
Scientific name: Sardinella Kensakou
Name: Kent Lake Pupfish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Cyprinodon diaboli
Name: Kentish Glory
Order: Gadiformes
Habitat: Marine
Scientific name: Gadus morhua
Name: Kentish Red Mullet
Order: Perciformes
Habitat: Marine
Scientific name: Mullus surmuletus
Name: Kentucky Darner
Order: Perciformes
Habitat: Freshwater
Scientific name: Etheostoma atripinne
Name: Kenya Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Enteromius anema
Name: Kenya Barracuda
Order: Scombriformes
Habitat: Marine
Scientific name: Sphyraena barracuda
Name: Kenyatta Cichlid
Order: Cichliformes
Habitat: Freshwater
Scientific name: Xystichromis phytophagus
Name: Keong's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Istigobius keongae
Name: Keonjhar Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura keonjharica
Name: Kepala Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Amblyeleotris novaecaledoniae
Name: Kepala Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys isabelae
Name: Keralasensis Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus keralensis
Name: Kerama Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobiodon keramaensis
Name: Kerinci Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kerricus
Name: Keris
Order: Perciformes
Habitat: Coral reefs in the Indo-Pacific
Scientific name: Acanthurus mata
Name: Kerkennah Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Pomatoschistus knipowitschi
Name: Kerkini Minnow
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Pelasgus Kerkiniensis
Name: Kermadec Cod
Order: Gadiformes
Habitat: Marine
Scientific name: Gadus merlangus
Name: Kermadec Flounder
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Ammotretis Kermadecensis
Name: Kermadec Moray
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax kermadecensis
Name: Kermadec Sole
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Peltorhamphus novaezeelandiae
Name: Kerner's Catfish
Order: Siluriformes
Habitat: Freshwater
Scientific name: Pimelodus microstoma
Name: Kerns Sculpin
Order: Scorpaeniformes
Habitat: Freshwater
Scientific name: Cottus kernensis
Name: Kerr's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius Kerr
Name: Kerri Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Enteromius kerri
Name: Kerri Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Callogobius keenani
Name: Kerrich's Carp-Gudgeon
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Mogurnda Kerrichae
Name: Kerriella
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Kerriella exanthemata
Name: Kerstin's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Eviota Kerstinae
Name: Kessinger's Darter
Order: Perciformes
Habitat: Freshwater
Scientific name: Etheostoma swaini
Name: Kessler's Goby
Order: Gobiiformes
Habitat: Freshwater/Brackish
Scientific name: Ponticola kessleri
Name: Kessler's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Sabanejewia kessleri
Name: Keswick Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Syngnathus caretta
Name: Keta Salmon
Order: Salmoniformes
Habitat: Freshwater/Marine
Scientific name: Oncorhynchus keta
Name: Ketapang Mudskipper
Order: Gobiiformes
Habitat: Brackish/Marine
Scientific name: Boleophthalmus Ketapangensis
Name: Ketong Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura ketongii
Name: Kew Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Coryphopterus alloides
Name: Kewpie Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Discordipinna griessingeri
Name: Key West Damselfish
Order: Perciformes
Habitat: Marine
Scientific name: Stegastes pictus
Name: Key-West Grunt
Order: Perciformes
Habitat: Marine
Scientific name: Haemulon macrostomum
Name: Keyhole Angelfish
Order: Perciformes
Habitat: Marine
Scientific name: Centropyge Keyhole
Name: Keyhole Cichlid
Order: Perciformes
Habitat: Freshwater
Scientific name: Cleithracara maronii
Name: Keyhole Wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Coris Keyhole
Name: Keystone Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gnatholepis cauerensis
Name: Khabarovsk Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa gruberi
Name: Khadi
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Labeo pangasia
Name: Khaffan Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Khaffan
Name: Khakhra Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura khakhraensis
Name: Khalaf's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Oxynoemacheilus khalafi
Name: Khalatbari's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Khalatbarianus
Name: Khan Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa khanensis
Name: Khan's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura khanae
Name: Khandek Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa khandek
Name: Khanna's Tetra
Order: Characiformes
Habitat: Freshwater
Scientific name: Hyphessobrycon khanna
Name: Khanoum Scraper
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Garra Khanoum
Name: Khanpur Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura khankana
Name: Khao Lae
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Hypsibarbus pierrei
Name: Khao Laem Botia
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Botia khaolamensis
Name: Khao Phanom Kraben Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura khaophanomkrabenensis
Name: Khao Sam Roi Yot Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura khaosanroiyotensis
Name: Khao Sok Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura khaosokensis
Name: Khao Yai Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura khaoyaiensis
Name: Khapra
Order: Cypriniformes
Habitat: Freshwater rivers in India and Southeast Asia
Scientific name: Labeo rohita
Name: Khartoum Catfish
Order: Siluriformes
Habitat: Freshwater
Scientific name: Synodontis schall
Name: Khasan Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa khasanensis
Name: Khasi Blind Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kaimuri
Name: Khasi Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa khasiensis
Name: Khasia Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Khasia
Name: Khasias Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius Khasiensis
Name: Khasis Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura khasinensis
Name: Khatoon's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa khatooni
Name: Khatooni Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Khatooni
Name: Khaur Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Khaur
Name: Khaw Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa khuatsoni
Name: Khawr Abd Allah Eel
Order: Anguilliformes
Habitat: Brackish/Marine
Scientific name: Anguilla Khawryi
Name: Khera's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Kheraensis
Name: Kheri Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura savona
Name: Khmer Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Syncrossus khmerensis
Name: Khoi Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius khohi
Name: Khoi Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa khoii
Name: Khor Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura khorasanensis
Name: Khorasan Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Khorasanensis
Name: Khorassan Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Carasobarbus kosswigi
Name: Khorat Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Acanthopsoides rothi
Name: Khorixas Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius Khorixasensis
Name: Khosrawi Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Khosrawi
Name: Khubani Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura khubani
Name: Khulna Glassfish
Order: Perciformes
Habitat: Freshwater
Scientific name: Chanda Khulnensis
Name: Khumbu Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa khumbuensis
Name: Khumbu Trout
Order: Salmoniformes
Habitat: Freshwater
Scientific name: Salmo Khumbuensis
Name: Khuwaja Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius hampi
Name: Khyber Scraper
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Garra Khyberensis
Name: Kiamichi Shiner
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Notropis Kiamachensis
Name: Kiangsu Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Sinogastromyzon puliensis
Name: Kiasu Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kiasuensis
Name: Kiatabong Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kiatabongi
Name: Kibar Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kibarensis
Name: Kiboga Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kibogaensis
Name: Kibong Goby
Order: Gobiiformes
Habitat: Freshwater/Brackish
Scientific name: Sicyopterus stimpsoni
Name: Kibonge Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Rhyacichthys guilberti
Name: Kid's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius kidi
Name: Kidepo Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Enteromius kidepo
Name: Kidney Spot Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius arulius
Name: Kiehn's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Bryaninops kiehnii
Name: Kien Giang Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kiengiangensis
Name: Kiener's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius Kieneri
Name: Kiener's Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Micrognathus richardi
Name: Kienle Scraper
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Garra Kienlei
Name: Kiev Goldfish
Order: Cypriniformes
Habitat: Freshwater (domesticated)
Scientific name: Carassius auratus
Name: Kigelia Cichlid
Order: Cichliformes
Habitat: Freshwater
Scientific name: Tilapia kigelia
Name: Kigoma Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kigomaensis
Name: Kihangara Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kihangaraensis
Name: Kihansi Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kihansiensis
Name: Kihansi Spinyfin
Order: Beryciformes
Habitat: Marine
Scientific name: Stomias boa boa
Name: Kihikihi
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Zanclus cornutus
Name: Kiho Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Ecsenius kiho
Name: Kijiki Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Amblyeleotris kijiki
Name: Kikai Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Fusigobius duospilus
Name: Kiko Damselfish
Order: Perciformes
Habitat: Marine
Scientific name: Pomacentrus kiko
Name: Kikuchi's Flathead
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Rogadius Kikuchii
Name: Kikuchi's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobiodon kikuchii
Name: Kikuchi's Halfbeak
Order: Beloniformes
Habitat: Marine
Scientific name: Hyporhamphus kikuchii
Name: Kikuchi's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kikuchii
Name: Kikuchi's Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys kikuchii
Name: Kikuyu Shark
Order: Carcharhiniformes
Habitat: Marine
Scientific name: Carcharhinus falciformis
Name: Kilakarai Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Kilakaraiensis
Name: Kilauea Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kilaueaenis
Name: Kilemba Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Kilembaensis
Name: Kilifi Eel
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax kilifi
Name: Kilifi Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Chiramenu goby
Name: Kilifi Tilapia
Order: Perciformes
Habitat: Freshwater
Scientific name: Tilapia ruweti
Name: Kilimanjaro Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Enteromius nummifer
Name: Kilimanjaro Barbel
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Labeobarbus kimberleyensis
Name: Kilimanjaro Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kilimanjaroensis
Name: Kilimanjaro Mouthbrooder
Order: Cichliformes
Habitat: Freshwater
Scientific name: Oreochromis Kilimanjaro
Name: Kilimanjaro Tilapia
Order: Cichliformes
Habitat: Freshwater
Scientific name: Tilapia Kilimanjaro
Name: Kilimi Tilapia
Order: Cichliformes
Habitat: Freshwater
Scientific name: Oreochromis kilimami
Name: Killifish
Order: Cyprinodontiformes
Habitat: Freshwater/Brackish
Scientific name: Fundulus heteroclitus
Name: Kilombero Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Enteromius kilomberoensis
Name: Kimbe Damselfish
Order: Perciformes
Habitat: Marine
Scientific name: Pomacentrus kimbe
Name: Kimberley Anchovy
Order: Clupeiformes
Habitat: Marine
Scientific name: Thryssa scratchleyi
Name: Kimberley Archerfish
Order: Perciformes
Habitat: Freshwater
Scientific name: Toxotes Kimberleyensis
Name: Kimberley Diamondfish
Order: Perciformes
Habitat: Marine
Scientific name: Terapon jarbua
Name: Kimberley Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobiodon Kimberley
Name: Kimberley Grunter
Order: Perciformes
Habitat: Freshwater
Scientific name: Leiopotherapon macrolepis
Name: Kimberley Mullet
Order: Mugiliformes
Habitat: Marine
Scientific name: Mugil cephalus
Name: Kimberley Whipray
Order: Myliobatiformes
Habitat: Marine
Scientific name: Himantura Kimberleyensis
Name: Kimito Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kimitoi
Name: Kimolos Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius kimolosensis
Name: Kinabalu Minnow
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Gastromyzon Kinabaluensis
Name: Kinabalu Shark Catfish
Order: Siluriformes
Habitat: Freshwater
Scientific name: Panaq Kinabaluensis
Name: Kinabalu Spiny Eel
Order: Synbranchiformes
Habitat: Freshwater
Scientific name: Macrognathus Kinabaluensis
Name: Kinabalu Tor
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Tor Kinabaluensis
Name: Kinabatangan Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Batoidea Kinabatangan
Name: Kincaid's Sculpin
Order: Scorpaeniformes
Habitat: Freshwater
Scientific name: Cottus Kincaidii
Name: Kinda Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kindaer
Name: King Angelfish
Order: Perciformes
Habitat: Marine
Scientific name: Holacanthus passer
Name: King Barracuda
Order: Perciformes
Habitat: Marine
Scientific name: Sphyraena barracuda
Name: King Coralfish
Order: Perciformes
Habitat: Marine
Scientific name: Chaetodon auriga
Name: King Croaker
Order: Perciformes
Habitat: Marine
Scientific name: Menticirrhus undulatus
Name: King Demoiselle
Order: Perciformes
Habitat: Marine
Scientific name: Neoglyphidodon nigroris
Name: King Dottyback
Order: Perciformes
Habitat: Marine
Scientific name: Pseudochromis kralji
Name: King Garra
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Garra Kingi
Name: King George Whiting
Order: Perciformes
Habitat: Marine
Scientific name: Sillaginodes punctata
Name: King Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius Kingi
Name: King Mackerel
Order: Scombriformes
Habitat: Marine
Scientific name: Scomberomorus cavalla
Name: King Mullet
Order: Mugiliformes
Habitat: Marine
Scientific name: Mugil curema
Name: King Neptune's Perch
Order: Perciformes
Habitat: Marine
Scientific name: Trudis Rex
Name: King Perch
Order: Perciformes
Habitat: Freshwater/Brackish/Marine
Scientific name: Lates calcarifer
Name: King Salmon
Order: Salmoniformes
Habitat: Anadromous
Scientific name: Oncorhynchus tshawytscha
Name: King Scad
Order: Perciformes
Habitat: Marine
Scientific name: Scomberomorus niphonius
Name: King Scallop Swellshark
Order: Carcharhiniformes
Habitat: Marine
Scientific name: Cephaloscyllium Königii
Name: King Threadfin
Order: Polynemiformes
Habitat: Marine
Scientific name: Polynemus sheridani
Name: King Vun's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kingvuni
Name: King of Denmark
Order: Ophidiiformes
Habitat: Marine
Scientific name: Brotula barbata
Name: King of the Herrings
Order: Gadiformes
Habitat: Marine
Scientific name: Molva molva
Name: King of the Mackerels
Order: Scombriformes
Habitat: Marine
Scientific name: Scomberomorus regalis
Name: King of the Salmons
Order: Salmoniformes
Habitat: Freshwater/Marine
Scientific name: Oncorhynchus tshawytscha
Name: King's Darter
Order: Perciformes
Habitat: Freshwater
Scientific name: Etheostoma Kingi
Name: King's Whiting
Order: Perciformes
Habitat: Marine
Scientific name: Sillaginodes punctata
Name: King-clip
Order: Ophidiiformes
Habitat: Marine
Scientific name: Genypterus capensis
Name: Kingfish
Order: Perciformes
Habitat: Marine
Scientific name: Scomberomorus commerson
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Name: Kingfish (Australian)
Order: Carangiformes
Habitat: Marine
Scientific name: Seriola lalandi
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Name: Kingfish (various species across orders)
Order: Perciformes
Habitat: Marine
Scientific name: Often Genus Scomberomorus
Name: Kingiak
Order: Perciformes
Habitat: Marine/Brackish
Scientific name: Platichthys stellatus
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Name: Kingklip (various species)
Order: Ophidiiformes
Habitat: Marine
Scientific name: Genypterus
Name: Kinglet
Order: Perciformes
Habitat: Marine (Colloquial for certain oarfish)
Scientific name: Regalecus russellii
Name: Kingsley's Cichlid
Order: Cichliformes
Habitat: Freshwater
Scientific name: Tilapia kingleyi
Name: Kingsley's Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys Kingsleyae
Name: Kingston Sculpin
Order: Cottoidei
Habitat: Freshwater
Scientific name: Cottus kingsleyi
Name: Kinmen Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Kinmenensis
Name: Kinnaman Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Syngnathus kinnamanis
Name: Kino Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Trimmatom macropus
Name: Kinoshita's Damselfish
Order: Perciformes
Habitat: Marine
Scientific name: Pomacentrus kinoshitae
Name: Kinoshita's Flounder
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Pleuronectes kinoshitae
Name: Kinoshita's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Paragunnellichthys kinoshitae
Name: Kinoshita's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rhinogobius kinoshitae
Name: Kinoshita's Scorpionfish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Scorpaena kinoshitae
Name: Kinoshita's Sculpin
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Myoxocephalus brandtii
Name: Kinshasa Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kinshasaensis
Name: Kinsler's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobiosoma kinslerae
Name: Kintaka Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Kintaka
Name: Kinubuna
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Carassius auratus buergeri
Name: Kiosan Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Kiosanensis
Name: Kipang Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kipangensis
Name: Kipungu Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kipunguensis
Name: Kira Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Vanderhorstia kira
Name: Kiribati Butterflyfish
Order: Perciformes
Habitat: Marine
Scientific name: Chaetodon ulietensis
Name: Kiribati Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Fusigobius kiribati
Name: Kirigamin Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Kirigaminensis
Name: Kirindy Threadfin
Order: Polynemiformes
Habitat: Marine
Scientific name: Polydactylus Kirindyensis
Name: Kirishima Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Rhinogobius kirishima
Name: Kiritimati Cardinalfish
Order: Perciformes
Habitat: Marine
Scientific name: Apogon kiritimati
Name: Kirk's Blenny
Order: Perciformes
Habitat: Marine
Scientific name: Entomacrodus kirki
Name: Kirk's Tilapia
Order: Cichliformes
Habitat: Freshwater
Scientific name: Tilapia kirkorum
Name: Kirke Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius kirki
Name: Kirkii Catfish
Order: Siluriformes
Habitat: Freshwater
Scientific name: Amphilius kirki
Name: Kirkwood's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kirkwoodi
Name: Kirmenica Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Cobitis taenia
Name: Kirumi Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kirumiana
Name: Kisangani Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kisanganiensis
Name: Kishinoue's Velvetfish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Gyrinomimus kishinouei
Name: Kishinoue's Wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Symphodus Kishinouei
Name: Kishore Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kishorei
Name: Kishore's Hill Trout
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Barilius kishorei
Name: Kishwar Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kishawarensis
Name: Kisihirata-Hata
Order: Perciformes
Habitat: Marine
Scientific name: Epinephelus Kisihirata
Name: Kiskadee Tetra
Order: Characiformes
Habitat: Freshwater
Scientific name: Hyphessobrycon Kiskadee
Name: Kissing Gourami
Order: Perciformes
Habitat: Freshwater
Scientific name: Helostoma temminckii
Name: Kissing Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Kissingensis
Name: Kistna Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kistnae
Name: Kitagami Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Oreias kitagamiensis
Name: Kitagata Skate
Order: Rajiformes
Habitat: Marine
Scientific name: Okamejei Kitagata
Name: Kitaibaragi Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Cobitis Kitaibaragi
Name: Kitaibaraki Goby
Order: Perciformes
Habitat: Freshwater
Scientific name: Rhinogobius kitaibarakiensis
Name: Kitakami Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Lefua Kitakamiensis
Name: Kitakami River Minnow
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Pseudorasbora Kitakami
Name: Kitakamigawa Minnow
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Pseudorasbora Kitakami
Name: Kitakaze Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Amblyeleotris kitanago
Name: Kitami Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rhinogobius kurodae
Name: Kitang
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Arothron hispidus
Name: Kitanglad Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kitangladensis
Name: Kitatara Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Kitatara
Name: Kitawo
Order: Perciformes
Habitat: Marine
Scientific name: Platax pinnatus
Name: Kitayama Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rhinogobius katsurae
Name: Kitayama's Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys kitayamae
Name: Kitefin Shark
Order: Squaliformes
Habitat: Deep waters worldwide
Scientific name: Dalatias licha
Name: Kitefish
Order: Perciformes
Habitat: Marine
Scientific name: Ilisha melastoma
Name: Kithul Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Kithulensis
Name: Kitina Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Stonogobiops kitina
Name: Kitongo Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kitongoensis
Name: Kitsilano Sculpin
Order: Scorpaeniformes
Habitat: Freshwater
Scientific name: Cottus Kitsilanoensis
Name: Kitsune Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Obliquogobius kitsunei
Name: Kittl
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Opsariichthys bidens
Name: Kitumbe Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Barboides kituwi
Name: Kiunga Rainbowfish
Order: Atheriniformes
Habitat: Freshwater
Scientific name: Melanotaenia Kiunga
Name: Kiva Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kivaensis
Name: Kivu Sardine
Order: Clupeiformes
Habitat: Freshwater
Scientific name: Limnothrissa miodon
Name: Kiwi Snapper
Order: Perciformes
Habitat: Coastal waters of New Zealand and Australia
Scientific name: Pagrus auratus
Name: Kiyo's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Eviota Kiyoshii
Name: Kiyomizu Goby
Order: Gobiiformes
Habitat: Brackish/Freshwater
Scientific name: Gymnogobius Kiyomizuensis
Name: Kiyomizu's Goby
Order: Perciformes
Habitat: Marine
Scientific name: Luciogobius kiyomizu
Name: Kiyosato Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Lefua Kiyosatoensis
Name: Kizakura Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rhinogobius kizakura
Name: Kizilirmak Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Oxynoemacheilus kizilirmakensis
Name: Kizilirmak Minnow
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Phoxinellus Kizilirmakensis
Name: Klamath River Sculpin
Order: Scorpaeniformes
Habitat: Freshwater
Scientific name: Cottus klamathensis
Name: Klamath Speckled Dace
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rhinichthys osculus klamathensis
Name: Klamath Tui Chub
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Gila bicolor klamathensis
Name: Klapata Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius Klapata
Name: Klaus' Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Labeo Klausi
Name: Klebergia
Order: Perciformes
Habitat: Marine
Scientific name: Scomberomorus klebergii
Name: Klebsi's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa klebsi
Name: Klemme's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Hetereleotris Klemmeae
Name: Klipfish
Order: Blenniiformes
Habitat: Marine
Scientific name: Clinus superciliosus
Name: Kliprand Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius Kliprandensis
Name: Knifefish
Order: Osteoglossiformes
Habitat: Freshwater in Asia and Africa
Scientific name: Notopterus notopterus
Name: Knifetooth Dogfish
Order: Squaliformes
Habitat: Marine
Scientific name: Scymnodon ringens
Name: Knight Goby
Order: Gobiiformes
Habitat: Brackish/Freshwater
Scientific name: Stigmatogobius sadanundio
Name: Knightia
Order: Clupeiformes
Habitat: Fossil fish from the Eocene Green River Formation
Scientific name: Knightia eocaena
Name: Knipovich's Sculpin
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Myoxocephalus knipowitschi
Name: Knobbed Porgy
Order: Perciformes
Habitat: Marine
Scientific name: Calamus nodosus
Name: Knothead Parrotfish
Order: Perciformes
Habitat: Marine
Scientific name: Chlorurus strongylocephalus
Name: Knysna Sandgoby
Order: Gobiiformes
Habitat: Marine
Scientific name: Psammogobius Knysnaensis
Name: Knysna Seahorse
Order: Syngnathiformes
Habitat: Marine
Scientific name: Hippocampus Capensis
Name: Ko's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Bathygobius Koi
Name: Kob
Order: Perciformes
Habitat: Coastal waters of the Indo-Pacific
Scientific name: Argyrosomus japonicus
Name: Kobata Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kobataensis
Name: Kobayashi's Scad
Order: Carangiformes
Habitat: Marine
Scientific name: Decapterus Kobayashii
Name: Kobayashi's Slimehead
Order: Beryciformes
Habitat: Marine
Scientific name: Hoplostethus Kobayashii
Name: Kobelt's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Kobelti
Name: Kobold Cichlid
Order: Cichliformes
Habitat: Freshwater
Scientific name: Neolamprologus kobelti
Name: Koch's Goby
Order: Perciformes
Habitat: Marine
Scientific name: Gobius koideae
Name: Koch's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kochii
Name: Koch's Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys Kochii
Name: Koch's Razorfish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Centriscus kochii
Name: Kochi Goby
Order: Gobiiformes
Habitat: Brackish/Freshwater
Scientific name: Gymnogobius Kochiensis
Name: Kochi Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Kochiensis
Name: Kodagu Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kodaguensis
Name: Kodak Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kodadensis
Name: Kodak Sea Serpent
Order: Ophichthiformes
Habitat: Marine
Scientific name: Leiuranus semicinctus
Name: Koga Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kogaensis
Name: Koga's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Sueviota koga
Name: Kogane Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Amblyeleotris kogane
Name: Kogoro Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Istigobius kogoro
Name: Kogure's Goby
Order: Perciformes
Habitat: Marine
Scientific name: Priolepis kogurei
Name: Koh Chang Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kohchangensis
Name: Koh Tao Cardinalfish
Order: Perciformes
Habitat: Marine
Scientific name: Apogon kohi
Name: Koha Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Koha
Name: Kohaku
Order: Cypriniformes
Habitat: Freshwater ponds (ornamental variety)
Scientific name: Cyprinus carpio
Name: Kohama's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Cryptocentrus kohamai
Name: Koheru
Order: Perciformes
Habitat: Marine
Scientific name: Seriola lalandi
Name: Kohinoor Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Kohinoor
Name: Kohler's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Stonogobiops kohleri
Name: Kohli's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Kohli
Name: Kohli's Searobin
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Prionotus Kohlsi
Name: Kohoutek's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Eviota kohouteki
Name: Koi
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Cyprinus rubrofuscus
Name: Koich Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Eviota koich
Name: Koirala's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa koiralai
Name: Koizumi's Goby
Order: Perciformes
Habitat: Marine
Scientific name: Gobius koizumii
Name: Koka
Order: Perciformes
Habitat: Freshwater
Scientific name: Lates niloticus
Name: Koka's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Trimma kokan
Name: Kokand Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kokandensis
Name: Kokanee
Order: Salmoniformes
Habitat: Freshwater lakes and rivers in North America
Scientific name: Oncorhynchus nerka kennerlyi
Name: Kokanee Salmon
Order: Salmoniformes
Habitat: Freshwater
Scientific name: Oncorhynchus nerka
Name: Kokcha Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kokonungus
Name: Koke Lake Sculpin
Order: Scorpaeniformes
Habitat: Freshwater
Scientific name: Cottus Kokeensis
Name: Koki Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Koki
Name: Kokinum Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kokinumaensis
Name: Koko's Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius Kokonao
Name: Kokoda Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Glossogobius Kokoda
Name: Kokoda Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kokodaensis
Name: Kokopu
Order: Osmeriformes
Habitat: Freshwater
Scientific name: Galaxias argenteus
Name: Kolaba Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kolabensis
Name: Kolad Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura koladensis
Name: Kolapore Frogfish
Order: Lophiiformes
Habitat: Marine
Scientific name: Antennarius kolapore
Name: Kolapore Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Kolaporensis
Name: Kolathur Goby
Order: Gobiiformes
Habitat: Brackish/Freshwater
Scientific name: Stigmatogobius Kolathurensis
Name: Kolenati's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kolenatii
Name: Kolhapur Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kolhapur
Name: Koli's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius Koli
Name: Koli's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Kolii
Name: Kolkata Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kolkataensis
Name: Kolkwitz's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kolkwitzii
Name: Koller's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius Kolleri
Name: Kollur Goby
Order: Gobiiformes
Habitat: Brackish/Marine
Scientific name: Acentrogobius Kollur
Name: Kololi Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Glossogobius kololi
Name: Kolong Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kolongensis
Name: Kolyma Whitefish
Order: Salmoniformes
Habitat: Freshwater
Scientific name: Coregonus kolymensis
Name: Kome's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Eviota kome
Name: Komo
Order: Perciformes
Habitat: Freshwater
Scientific name: Lates mariae
Name: Komodo Dragonet
Order: Perciformes
Habitat: Marine
Scientific name: Synchiropus Komodoensis
Name: Komodo Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Pleurosicya komodoensis
Name: Kompong Thom Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius kompongthomsis
Name: Kon Chu Ray Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura konchurayaensis
Name: Kon Tum Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Schismatogobius marmoratus
Name: Kona Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus konadaensis
Name: Konaganalli Scraper
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Garra Konaganalli
Name: Konarak Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Konarakensis
Name: Konark Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus konarkensis
Name: Konda Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius kondaensis
Name: Konda Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura konda
Name: Kondana
Order: Perciformes
Habitat: Freshwater
Scientific name: Serranochromis stappersi
Name: Kondang Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Pangio cuneovirgata
Name: Kondao Triplefin
Order: Blenniiformes
Habitat: Marine
Scientific name: Copocentra koala
Name: Kondapalli Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kondapallii
Name: Konde Lizardfish
Order: Aulopiformes
Habitat: Marine
Scientific name: Synodus konde
Name: Konder's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura konderi
Name: Kondool Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kondool
Name: Kondoz Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kondozensis
Name: Kone Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys flavofasciatus
Name: Koneprusy Goby
Order: Perciformes
Habitat: Brackish
Scientific name: Gobius koneprusyensis
Name: Koneprusy Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Cobitis koneprusyi
Name: Kong Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kongkandensis
Name: Kong Shark
Order: Lamniformes
Habitat: Marine (Goblin Shark is more common name)
Scientific name: Mitsukurina owstoni
Name: Kong's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Kongi
Name: Konga
Order: Perciformes
Habitat: Freshwater
Scientific name: Lates niloticus
Name: Kongju Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Koreocobitis kongjuensis
Name: Kongo Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Eviota kongo
Name: Kongola
Order: Perciformes
Habitat: Freshwater
Scientific name: Oreochromis macrochir
Name: Konia Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Enteromius konianensis
Name: Konjo Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Istigobius konjo
Name: Konkan Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura konkanensis
Name: Konkon
Order: Perciformes
Habitat: Marine/Brackish
Scientific name: Lates calcarifer
Name: Konku Stream Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura konkukensis
Name: Kono's Goby
Order: Perciformes
Habitat: Freshwater
Scientific name: Gymnogobius konoi
Name: Kontum Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kontumensis
Name: Kookaburra Cod
Order: Perciformes
Habitat: Freshwater rivers in Australia
Scientific name: Maccullochella peelii
Name: Koolie Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Pangio kuhlii
Name: Koon's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Eviota koonsi
Name: Koorin Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Coryphopterus koorin
Name: Kopang
Order: Perciformes
Habitat: Freshwater
Scientific name: Oreochromis macrochir
Name: Koper Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius koperensis
Name: Kopetdag Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Oxynoemacheilus kopepdagensis
Name: Kopp's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa koppi
Name: Kopri Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Eviota kopri
Name: Kopytnikova's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kopytnykovae
Name: Korat Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius partipentazona
Name: Korat Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura koratensis
Name: Korbus Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus korbus
Name: Kordofan Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius kordofanensis
Name: Korea Flyingfish
Order: Beloniformes
Habitat: Marine
Scientific name: Cheilopogon koreaensis
Name: Korea Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius Coreanus
Name: Korean Bitterling
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rhodeus Uyekii
Name: Korean Halibut
Order: Pleuronectiformes
Habitat: Coastal waters of the Northwest Pacific
Scientific name: Paralichthys olivaceus
Name: Korean Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Koreocobitis Koreanus
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Name: Korean Loach (alternative)
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Misgurnus mizolepis
Name: Korean Perch
Order: Perciformes
Habitat: Freshwater
Scientific name: Coreoperca herzi
Name: Korean Rockfish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Sebastes koreanus
Name: Korean Shark
Order: Carcharhiniformes
Habitat: Marine
Scientific name: Chimaera koreana
Name: Korhogo Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura korhogoensis
Name: Kori's Goby
Order: Perciformes
Habitat: Marine
Scientific name: Amblyeleotris kori
Name: Korimudu Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius korimudu
Name: Koriya Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus koriensis
Name: Korolkow's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa korolkowi
Name: Koromo's Dragonet
Order: Perciformes
Habitat: Marine
Scientific name: Callionymus koromoi
Name: Koror Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Kororensis
Name: Kororo Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Amblyeleotris koumansi
Name: Korumdu Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa korumduensis
Name: Koryak Mudfish
Order: Cyprinodontiformes
Habitat: Freshwater rivers in Siberia
Scientific name: Phoxinus koryakensis
Name: Kose's Goby
Order: Perciformes
Habitat: Marine
Scientific name: Luciogobius koseensis
Name: Kosi Rockcod
Order: Perciformes
Habitat: Marine
Scientific name: Epinephelus coioides
Name: Kosrae Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Stonogobiops nematodes
Name: Kossati's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kossati
Name: Kossi Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kossi
Name: Kosugi's Tripod Fish
Order: Aulopiformes
Habitat: Marine
Scientific name: Bathypterois kosugii
Name: Kotka Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kotkaensis
Name: Kotra Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Kotraensis
Name: Kottayam Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kottelat
Name: Kottelat's Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius kottelati
Name: Kottelat's Rasbora
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rasbora kottelati
Name: Kottha Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Kottha
Name: Kotuwa Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius srilankensis
Name: Kotzebue Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kotzebuei
Name: Kou Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius Kou
Name: Kou's Anchovy
Order: Clupeiformes
Habitat: Marine
Scientific name: Thrissa koumansi
Name: Kouga Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kougaensis
Name: Kouilou Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kouilouensis
Name: Koumac Skate
Order: Rajiformes
Habitat: Marine
Scientific name: Dipturus endeavouri
Name: Koumans' Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius Koumansi
Name: Koumans' Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Hippichthys koumansi
Name: Koumans' Pugmy Goby
Order: Perciformes
Habitat: Marine
Scientific name: Trimmatom koumansi
Name: Koumans' Worm Goby
Order: Gobiiformes
Habitat: Brackish/Marine
Scientific name: Brachyamblyopus Koumansi
Name: Kovalam Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntius kovalamensis
Name: Kovalam Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura Kovalamensis
Name: Kovalam Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys kovalama
Name: Kovda Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kovaeae
Name: Kowi
Order: Siluriformes
Habitat: Freshwater
Scientific name: Hemibagrus nemurus
Name: Kowloon Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Microphysogobio kowloonensis
Name: Koy's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura koyai
Name: Koya Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Eviota koya
Name: Koya Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus koyaensis
Name: Koyanagi's Flyingfish
Order: Beloniformes
Habitat: Marine
Scientific name: Cheilopogon Koyanagii
Name: Koyu Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Koyuensis
Name: Kozaki Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kozakii
Name: Kozima's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Cryptocentrus kozima
Name: Kozlov's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus Kozlovi
Name: Kozuka's Goby
Order: Gobiiformes
Habitat: Brackish/Freshwater
Scientific name: Gymnogobius Kozukai
Name: Krabi Mudskipper
Order: Gobiiformes
Habitat: Brackish/Marine
Scientific name: Boleophthalmus Krabiensis
Name: Krah's Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius Krahi
Name: Kralendijk Toadfish
Order: Batrachoidiformes
Habitat: Marine
Scientific name: Opsanus krabbenhoefti
Name: Kramer's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa krameri
Name: Kranji Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Vanderhorstia kranji
Name: Kranji Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kranjiensis
Name: Krasnodar Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Cobitis krasnodarensis
Name: Krasnov's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa krasnovi
Name: Krasnozhen's Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Sicyopterus krasnozheni
Name: Krauss's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius kraussii
Name: Krauss's Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Lissocampus kraussi
Name: Krefft's Catshark
Order: Carcharhiniformes
Habitat: Marine
Scientific name: Apristurus kreffti
Name: Krefft's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gnatholepis kreffti
Name: Krefft's Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys kreffti
Name: Krempf's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura krempfi
Name: Krempf's Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Ichthyocampus krempfi
Name: Krempf's Wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Halichoeres krempfi
Name: Kreuiter's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Pleurosicya kreuiteri
Name: Kribensis
Order: Cichliformes
Habitat: Freshwater rivers in West Africa
Scientific name: Pelvicachromis pulcher
Name: Kribi Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kribiensis
Name: Kribi Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kribiensis
Name: Krishna Perch
Order: Perciformes
Habitat: Freshwater
Scientific name: Chanda nama
Name: Krista's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa krista
Name: Kroc's Triplefin Blenny
Order: Perciformes
Habitat: Marine
Scientific name: Enneapterygius krocma
Name: Kroeyer's Gasterosteus
Order: Gasterosteiformes
Habitat: Freshwater
Scientific name: Gasterosteus kroyeri
Name: Kroh Tiger Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Puntigrus anchispiroxilosus
Name: Kruyswijk's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kruyswijkii
Name: Ku-Min Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kumminensis
Name: Kuah Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kuah
Name: Kuala Lampan Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus selangoricus
Name: Kuantan Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kuantanensis
Name: Kubare Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Trimma kubare
Name: Kuber's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kuberi
Name: Kubota's Goby
Order: Perciformes
Habitat: Marine
Scientific name: Priolepis kubotae
Name: Kubuna
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Carassius auratus buergeri
Name: Kuchi Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kuchi
Name: Kuching Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kuchingensis
Name: Kudal Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kudal
Name: Kuduk Goby
Order: Gobiiformes
Habitat: Brackish
Scientific name: Pseudogobius kuduk
Name: Kueh's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kuehni
Name: Kuhl's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Pangio kuhlii
Name: Kuhl's Stingray
Order: Myliobatiformes
Habitat: Marine
Scientific name: Neotrygon kuhlii
Name: Kuhlia
Order: Perciformes
Habitat: Freshwater streams in the Indo-Pacific
Scientific name: Kuhlia rupestris
Name: Kukri Catfish
Order: Siluriformes
Habitat: Freshwater
Scientific name: Olyra kempi
Name: Kukri Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kukri
Name: Kukuru Fish
Order: Perciformes
Habitat: Marine
Scientific name: Dules auriga
Name: Kulala Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kulalensiss
Name: Kulambu
Order: Perciformes
Habitat: Freshwater
Scientific name: Oreochromis sp. 'Kulambu'
Name: Kuloli Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Glossogobius kuloli
Name: Kulon Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kulonensis
Name: Kulon Progo Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kulonprogoensis
Name: Kulu Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kuluensis
Name: Kului
Order: Perciformes
Habitat: Marine
Scientific name: Epinephelus areolatus
Name: Kumagai's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Paratrypauchen kumagaii
Name: Kumakuma
Order: Scorpaeniformes
Habitat: Freshwater rivers in Japan
Scientific name: Cottus nozawai
Name: Kumamoto Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Rhinogobius giurinus
Name: Kumanan's Snake Eel
Order: Anguilliformes
Habitat: Marine
Scientific name: Pisodonophis kumananae
Name: Kumaon Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kumaonensis
Name: Kumasi Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kumasiensis
Name: Kumasi Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kumasiensis
Name: Kumbar Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kumbar
Name: Kumbarayil Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kumbarayli
Name: Kumbaro
Order: Perciformes
Habitat: Freshwater
Scientific name: Serranochromis macrocephalus
Name: Kumbharia Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kumbharia
Name: Kumejima Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Trimma kumejima
Name: Kumgang Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kumgangsanensis
Name: Kuminga Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius kumingaensis
Name: Kumul Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Trimma kumul
Name: Kuna Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Eviota koppi
Name: Kunashiri Skate
Order: Rajiformes
Habitat: Marine
Scientific name: Okamejei kunashirica
Name: Kunchin Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kunchinensis
Name: Kundal Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kundali
Name: Kundavaram Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kundavaramensis
Name: Kunduchi Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Acentrogobius kunduchi
Name: Kungfu Panda Loach
Order: Cypriniformes
Habitat: Freshwater streams in Southeast Asia
Scientific name: Pangio cuneavirgata
Name: Kuni
Order: Salmoniformes
Habitat: Freshwater
Scientific name: Oncorhynchus masou ishikawae
Name: Kuni's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Sueviota kunea
Name: Kunkun
Order: Perciformes
Habitat: Marine/Brackish
Scientific name: Lates calcarifer
Name: Kunlun Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kunlunensis
Name: Kunming Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kungmingensis
Name: Kuntai Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kuntai
Name: Kuo's Goby
Order: Perciformes
Habitat: Freshwater
Scientific name: Rhinogobius kuoi
Name: Kupang Mudskipper
Order: Gobiiformes
Habitat: Brackish/Marine
Scientific name: Periophthalmus modestus
Name: Kupang Snapper
Order: Lutjaniformes
Habitat: Coral reefs of the Indo-Pacific
Scientific name: Lutjanus fulvus
Name: Kura Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Alburnoides kurui
Name: Kurdistan Killifish
Order: Cyprinodontiformes
Habitat: Freshwater/Brackish
Scientific name: Aphanius mento
Name: Kurdistan Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Oxynoemacheilus kurdistanicus
Name: Kure's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Eviota kure
Name: Kuredu's Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Halicampus kurenbachii
Name: Kuri Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kurichan
Name: Kurihashi Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rhinogobius kurihashi
Name: Kurihashi's Goby
Order: Perciformes
Habitat: Freshwater
Scientific name: Rhinogobius kurihashii
Name: Kurihashi's Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys kurihashi
Name: Kuril Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Amblyeleotris kurilensis
Name: Kuril Mudfish
Order: Cyprinodontiformes
Habitat: Freshwater rivers in the Kuril Islands
Scientific name: Phoxinus kurilensis
Name: Kuril Skate
Order: Rajiformes
Habitat: Marine
Scientific name: Bathyraja curvirostris
Name: Kurland Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius kurlandiae
Name: Kuro Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kuroiwae
Name: Kuroda's Goby
Order: Perciformes
Habitat: Freshwater
Scientific name: Rhinogobius kurodae
Name: Kuroda's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kurodae
Name: Kurofune Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Akihito hoshinoi
Name: Kurohime Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Trimma kurohime
Name: Kurohira Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rhinogobius kurohira
Name: Kuroshima Frogfish
Order: Lophiiformes
Habitat: Marine
Scientific name: Antennarius kuroshima
Name: Kuroshio Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kuroshioensis
Name: Kurper
Order: Cichliformes
Habitat: Freshwater lakes and rivers in Southern Africa
Scientific name: Tilapia sparrmanii
Name: Kurtus
Order: Perciformes
Habitat: Marine
Scientific name: Kurtus indicus
Name: Kurume Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kurumeensis
Name: Kusa Spotfin Mojarra
Order: Perciformes
Habitat: Marine
Scientific name: Gerres equulus
Name: Kusa-ayu
Order: Osmeriformes
Habitat: Freshwater
Scientific name: Plecoglossus altivelis
Name: Kusaie Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Trimma yanoi
Name: Kusan Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Trimma kusan
Name: Kusatsu Goby
Order: Perciformes
Habitat: Freshwater
Scientific name: Rhinogobius kusatsuensis
Name: Kushan Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kushani
Name: Kushimoto Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Amblygobius phalaena
Name: Kushtia Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kushtiai
Name: Kuskokwim Sculpin
Order: Scorpaeniformes
Habitat: Freshwater
Scientific name: Myoxocephalus platycephalus
Name: Kusu
Order: Perciformes
Habitat: Marine/Brackish
Scientific name: Lates calcarifer
Name: Kusumi's Goby
Order: Perciformes
Habitat: Marine
Scientific name: Macrodontogobius kusumi
Name: Kusuri's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kusuri
Name: Kutaisi Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Cobitis kutaisiensis
Name: Kutan Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kutanensis
Name: Kutei Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Stenogobius kutei
Name: Kuttanad Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kuttanadensis
Name: Kutum
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rutilus kutum
Name: Kuu Goby
Order: Perciformes
Habitat: Marine
Scientific name: Trimmatom kuuae
Name: Kuwabara's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Amblyeleotris kuwabarakoi
Name: Kuwahara's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius kuwaharai
Name: Kuyper's Goby
Order: Gobiiformes
Habitat: Freshwater/Brackish
Scientific name: Stigmatogobius kuyperi
Name: Kuznetsov's Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kuznetsovi
Name: Kwama
Order: Perciformes
Habitat: Freshwater
Scientific name: Lates mariae
Name: Kwando Barb
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Enteromius paludinosus
Name: Kwangsi Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kwangsiensis
Name: Kwangtung Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kwangtungensis
Name: Kwazulu Goby
Order: Gobiiformes
Habitat: Estuaries in South Africa
Scientific name: Oxyurichthys microlepis
Name: Kwazulu Wrasse
Order: Perciformes
Habitat: Marine (Not very common usage)
Scientific name: Symphodus rostratus
Name: Kweichow Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Schistura kweichowensis
Name: Kwikwi
Order: Siluriformes
Habitat: Freshwater
Scientific name: Clarias gariepinus
Name: Kyakatu
Order: Perciformes
Habitat: Freshwater
Scientific name: Lates mariae
Name: Kyeema
Order: Perciformes
Habitat: Freshwater
Scientific name: Lates mariae
Name: Kyodo Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kyodoensis
Name: Kyoga Mouthbrooder
Order: Perciformes
Habitat: Freshwater
Scientific name: Haplochromis nuchisquamulatus
Name: Kyrgyz Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Triplophysa kyrgyzensis
Name: Kyushu Goby
Order: Perciformes
Habitat: Freshwater
Scientific name: Rhinogobius kyushuensis
Name: Kyushu Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus九州
Name: Kyzylkum Stone Loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Nemacheilus kryzhanovskii
| Name | Order | Habitat | Scientific name |
|---|---|---|---|
| Kabar Goby | Gobiiformes | Freshwater | Odonteleotris macrodon |
| Kabaragoya | Perciformes | Freshwater | Kabaragoya malabarica |
| Kabaragoya Barb | Cypriniformes | Freshwater | Puntius mahanadiensis |
| Kabarore | Cypriniformes | Freshwater | Labeobarbus Kabarore |
| Kabompo Spinyfin | Perciformes | Freshwater | Acanthoperca kabompoensis |
| Kabuki Goby | Gobiiformes | Marine | Ophiogobius melanosoma |
| Kabuli Loach | Cypriniformes | Freshwater | Triplophysa kabuli |
| Kachal Loach | Cypriniformes | Freshwater | Schistura kachalensis |
| Kadaba Barb | Cypriniformes | Freshwater | Puntius kadaba |
| Kadana Barb | Cypriniformes | Freshwater | Puntius kadnensis |
| Kadipore Barb | Cypriniformes | Freshwater | Puntius kadiporensis |
| Kafa Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kafaensis |
| Kafjord cod | Gadiformes | Marine | Gadus morhua |
| Kafue Killifish | Cyprinodontiformes | Freshwater | Nothobranchius Kafuensis |
| Kagami Goby | Gobiiformes | Marine | Gobiopsis kagami |
| Kagan's Barb | Cypriniformes | Freshwater | Puntius kaganensis |
| Kagan's Cardinalfish | Perciformes | Marine | Apogon kaganensis |
| Kagan's Moray | Anguilliformes | Marine | Gymnothorax kagani |
| Kager's Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kageri |
| Kageru Tilapia | Cichliformes | Freshwater | Oreochromis kageruensis |
| Kageyama's Moray | Anguilliformes | Marine | Gymnothorax kageyamae |
| Kagoshima Flathead | Scorpaeniformes | Marine | Platycephalus kagoshimae |
| Kagoshima Goby | Gobiiformes | Brackish/Freshwater | Gymnogobius Kagoshimensis |
| Kagus | Batrachoidiformes | Marine | Opsanus Kagus |
| Kaguya Goby | Gobiiformes | Marine | Sueviota kaguya |
| Kahn's Tetra | Characiformes | Freshwater | Hyphessobrycon Kahnii |
| Kaiawa Goby | Gobiiformes | Marine | Stonogobiops kaiawa |
| Kaichika Loach | Cypriniformes | Freshwater | Hedinichthys kaiya |
| Kaifu Skate | Rajiformes | Marine | Okamejei kaifunensis |
| Kaiga Barb | Cypriniformes | Freshwater | Puntius kaigaensis |
| Kaikoura Goby | Gobiiformes | Marine | Gobionellus stomias |
| Kailash Scraper | Cypriniformes | Freshwater | Garra Kailash |
| Kaili Goby | Gobiiformes | Marine | Chiramenu kaili |
| Kailola's Sea Catfish | Siluriformes | Brackish | Arius kailolai |
| Kaimaki Goby | Perciformes | Brackish | Gobius kaimakliensis |
| Kaimana Hardyhead | Atheriniformes | Freshwater | Craterocephalus Kaimana |
| Kaimosi Barb | Cypriniformes | Freshwater | Enteromius kaimosi |
| Kaingaroa Goby | Gobiiformes | Freshwater | Pseudogobius Kaingaroa |
| Kaiparathana | Perciformes | Marine | Kaiparathana Indicus |
| Kaiping Loach | Cypriniformes | Freshwater | Paracobitis kaipingensis |
| Kairaki | Perciformes | Marine | Kairakia labiata |
| Kairezi River Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kairensis |
| Kairouan Killifish | Cypriniformes | Freshwater/Brackish | Aphanius mento |
| Kaiser Botia | Cypriniformes | Freshwater | Botia kubotai |
| Kaiser Loach | Cypriniformes | Freshwater | Schistura kottelati |
| Kaiser Triggerfish | Tetraodontiformes | Marine | Balistes Kaiser |
| Kaivalya Barb | Cypriniformes | Freshwater | Hypselobarbus kairali |
| Kajang Barb | Cypriniformes | Freshwater | Barbodes kajangensis |
| Kaji's Flathead | Scorpaeniformes | Marine | Bembras kaji |
| Kajika | Scorpaeniformes | Freshwater | Cottus reinii |
| Kajiki | Tetraodontiformes | Marine | Makaira mazara |
| Kajikia albida | Istiophoriformes | Marine | Kajikia albida |
| Kajimuri Catfish | Siluriformes | Freshwater | Ompok kajimuri |
| Kakabain Cichlid | Cichliformes | Freshwater | Tilapia kakabensis |
| Kakadu Hardyhead | Atheriniformes | Freshwater | Craterocephalus kakaduensis |
| Kakamega Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kakamegensis |
| Kakamouéké's Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kakamouekaensis |
| Kakapo Perchlet | Perciformes | Freshwater | Percosoma kakapo |
| Kakhovka Loach | Cypriniformes | Freshwater | Cobitis kakhovkaensis |
| Kakinada Goby | Gobiiformes | Brackish | Mudskipper Kakinada |
| Kakuna | Siluriformes | Freshwater | Mystus Kakuna |
| Kala Goby | Gobiiformes | Freshwater | Pandaka kala |
| Kalaa | Tetraodontiformes | Marine | Arothron stellatus |
| Kalabagan Loach | Cypriniformes | Freshwater | Schistura notostigma |
| Kalabakan Barb | Cypriniformes | Freshwater | Puntius kalabakanensis |
| Kalahari Cichlid | Perciformes | Freshwater | Serranochromis robustus |
| Kalahari Kilifish | Cyprinodontiformes | Freshwater | Nothobranchius Kalahari |
| Kalahari Tope | Carcharhiniformes | Marine | Carcharhinus obscurus |
| Kalakad Barb | Cypriniformes | Freshwater | Puntius kalakadensis |
| Kalakad Loach | Cypriniformes | Freshwater | Schistura Kalakadensis |
| Kalakadu Barb | Cypriniformes | Freshwater | Puntius nangalensis |
| Kalaloch Creek Lamprey | Petromyzontiformes | Freshwater | Lampetra richardsoni |
| Kalam Fish | Siluriformes | Freshwater | Rita chrysea |
| Kalamo | Perciformes | Freshwater | Kalamo kapi |
| Kalao Barb | Cypriniformes | Freshwater | Puntius Kalaoensis |
| Kalao Damselfish | Perciformes | Marine | Pomacentrus kalao |
| Kalau Goby | Perciformes | Marine | Gobiopsis kalau |
| Kalbar Stonefish | Scorpaeniformes | Marine | Synanceia kalbari |
| Kalemana Loach | Cypriniformes | Freshwater | Homaloptera Kalemana |
| Kali Loach | Cypriniformes | Freshwater | Nemacheilus Kali |
| Kalibar Barb | Cypriniformes | Freshwater | Puntius kalibarensis |
| Kalimantan Archerfish | Perciformes | Brackish | Toxotes kampotensis |
| Kalimantan Glass Catfish | Siluriformes | Freshwater | Kryptopterus macrocephalus |
| Kalimantan Mudskipper | Gobiiformes | Brackish/Marine | Boleophthalmus Kalimantan |
| Kalimantan Snakehead | Perciformes | Freshwater | Channa kalimantana |
| Kalimpong Loach | Cypriniformes | Freshwater | Schistura manipurensis |
| Kalinga Barb | Cypriniformes | Freshwater | Puntius kalimantanus |
| Kalingan Labio | Cypriniformes | Freshwater | Labio kalinganensis |
| Kalinganadu Barb | Cypriniformes | Freshwater | Hypselobarbus kalus |
| Kalk Bay Sandgoby | Gobiiformes | Marine | Monishia sandagayensis |
| Kallaba Goby | Gobiiformes | Marine | Eugnathogobius kabilia |
| Kallada Barb | Cypriniformes | Freshwater | Dawkinsia Kallada |
| Kallada Killifish | Cyprinodontiformes | Freshwater | Aplocheilus Kallada |
| Kallamkuzhy Loach | Cypriniformes | Freshwater | Nemacheilus pallidus |
| Kallur Barb | Cypriniformes | Freshwater | Puntius kallarensis |
| Kalong Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kalongensis |
| Kaloula Tetra | Characiformes | Freshwater | Hemigrammus Kaloula |
| Kalpeni Loach | Cypriniformes | Freshwater | Schistura kalpanai |
| Kalu Ganga Loach | Cypriniformes | Freshwater | Schistura barmouth |
| Kaludi Carp | Cypriniformes | Freshwater | Labeo Kaludi |
| Kaluga Sturgeon | Acipenseriformes | Freshwater/Brackish | Huso dauricus |
| Kalukala | Anguilliformes | Marine | Gymnothorax shaoi |
| Kalumbe's Barb | Cypriniformes | Freshwater | Enteromius kalumbei |
| Kalyanam's Barb | Cypriniformes | Freshwater | Puntius Kalyanamensis |
| Kamaka Goby | Gobiiformes | Freshwater/Brackish | Eleotris fusca |
| Kamaka Loach | Cypriniformes | Freshwater | Schistura kamakakhyaensis |
| Kamakura Goby | Gobiiformes | Brackish/Freshwater | Gymnogobius Kamakura |
| Kamal's Loach | Cypriniformes | Freshwater | Schistura kamali |
| Kambara's Dragonet | Perciformes | Marine | Repomucenus kamabara |
| Kambara's Goby | Perciformes | Marine | Fusigobius kamoharae |
| Kambara's Pipefish | Syngnathiformes | Marine | Corythoichthys kamoharae |
| Kambara's Scorpionfish | Scorpaeniformes | Marine | Scorpaena karasou |
| Kambara's Snake Eel | Anguilliformes | Marine | Ptymosudis kamoharae |
| Kambara's Triplefin | Perciformes | Marine | Enneapterygius Kambara |
| Kambarage Tilapia | Cichliformes | Freshwater | Oreochromis kambarage |
| Kambarang Barb | Cypriniformes | Freshwater | Puntius kambarang |
| Kambaya Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kambayensis |
| Kamboja Loach | Cypriniformes | Freshwater | Schistura kamboja |
| Kamchatka Sculpin | Scorpaeniformes | Freshwater | Cottus kamchatkaensis |
| Kamchatkan Flounder | Pleuronectiformes | Marine | Atheresthes stomias |
| Kamerun Loach | Cypriniformes | Freshwater | Schistura reticulata |
| Kameswari Loach | Cypriniformes | Freshwater | Nemacheilus kameswarensis |
| Kamihata's Sandperch | Perciformes | Marine | Parapercis kamihatai |
| Kamilam Goby | Gobiiformes | Marine | Gobiodon okinawae |
| Kamohara's Dragonet | Perciformes | Marine | Callionymus kamoharae |
| Kamohara's Moray | Anguilliformes | Marine | Gymnothorax kamoharae |
| Kamohara's Skate | Rajiformes | Marine | Okamejei kamoharai |
| Kamohara's Tonguefish | Pleuronectiformes | Marine | Symphurus kamoharae |
| Kampa Loach | Cypriniformes | Freshwater | Schistura kampaensis |
| Kampong Catfish | Siluriformes | Freshwater | Clarias Kampongensis |
| Kampong Speu Loach | Cypriniformes | Freshwater | Schistura kampucheensis |
| Kampung Gourami | Gouramiiformes | Freshwater | Trichopodus trichopterus |
| Kampung Loach | Cypriniformes | Freshwater | Pangio Kampung |
| Kanaana Goby | Gobiiformes | Marine | Gobiopsis kanae |
| Kanabai Goby | Gobiiformes | Freshwater/Brackish | Stigmatogobius romeri |
| Kanade Goby | Gobiiformes | Marine | Vanderhorstia ambanoro |
| Kanadi Goby | Gobiiformes | Marine | Stonogobiops kanadi |
| Kanadi Grunt | Perciformes | Marine | Pomadasys kanadayi |
| Kanadi Tonguefish | Pleuronectiformes | Marine | Cynoglossus kanadensis |
| Kanagasabapathy's Barb | Cypriniformes | Freshwater | Puntius kanagae |
| Kanak Goby | Gobiiformes | Marine | Amblyeleotris kanakarum |
| Kanakan Goby | Gobiiformes | Marine | Amblyeleotris arcupinna |
| Kanakana | Anguilliformes | Freshwater/Brackish | Anguilla dieffenbachii |
| Kanamede Skate | Rajiformes | Marine | Okamejei kenojei |
| Kanape Goby | Gobiiformes | Freshwater/Brackish | Stigmatogobius signifer |
| Kanawha Darter | Perciformes | Freshwater | Etheostoma kanawhae |
| Kanawha Minnow | Cypriniformes | Freshwater | Phenacobius teretulus |
| Kanchana Barb | Cypriniformes | Freshwater | Puntius kanchana |
| Kancheepuram Snakehead | Anabantiformes | Freshwater | Channa Kancheepuramensis |
| Kanchenjunga Loach | Cypriniformes | Freshwater | Schistura Kanchenjungaensis |
| Kanda Moray | Anguilliformes | Marine | Gymnothorax kandanus |
| Kandahar Loach | Cypriniformes | Freshwater | Triplophysa kandaharica |
| Kandai Mudskipper | Gobiiformes | Brackish | Boleophthalmus dentata |
| Kandak Loach | Cypriniformes | Freshwater | Triplophysa kandak |
| Kandalakscha Cod | Gadiformes | Marine | Gadus morhua |
| Kandangan Loach | Cypriniformes | Freshwater | Schistura kottelati |
| Kandia Shark | Carcharhiniformes | Marine | Carcharhinus plumbeus |
| Kandla Goby | Gobiiformes | Brackish/Marine | Acentrogobius gangata |
| Kanduli | Siluriformes | Marine/Brackish | Arius thalassinus |
| Kanduli Catfish | Siluriformes | Brackish | Arius nudiceps |
| Kanebo Brotula | Ophidiiformes | Marine | Brotula Kanebo |
| Kanehira's Anchovy | Clupeiformes | Marine | Thrissina kanehirae |
| Kanekonia's Scorpionfish | Scorpaeniformes | Marine | Scorpaenopsis kanekonia |
| Kangaroo Shark | Carcharhiniformes | Marine | Carcharhinus brachyurus |
| Kangaroofish | Aulopiformes | Marine | Plesiobatis daviesi |
| Kangavar Loach | Cypriniformes | Freshwater | Schistura kangavarana |
| Kangean Cardinalfish | Perciformes | Marine | Apogon kangeanensis |
| Kangean Snake Eel | Anguilliformes | Marine | Myrichthys kangeanensis |
| Kanguru Bass | Perciformes | Marine | Cynoscion kanguru |
| Kangyuan Loach | Cypriniformes | Freshwater | Triplophysa kangyuanensis |
| Kani Goby | Gobiiformes | Marine | Cryptocentrus kanifushi |
| Kani-fish | Perciformes | Freshwater | Lates mariae |
| Kaniharu Loach | Cypriniformes | Freshwater | Schistura kaniyar |
| Kaningi Barb | Cypriniformes | Freshwater | Enteromius kaningensis |
| Kankey Loach | Cypriniformes | Freshwater | Schistura naggujii |
| Kanmalai Loach | Cypriniformes | Freshwater | Schistura kohatensis |
| Kanniyakumari Loach | Cypriniformes | Freshwater | Schistura robertsi |
| Kano Mudfish | Cyprinodontiformes | Freshwater | Clarias gariepinus |
| Kanon Goby | Gobiiformes | Freshwater | Rhinogobius flumineus |
| Kansai Halfbeak | Beloniformes | Marine | Hyporhamphus Kansainus |
| Kansas Darter | Perciformes | Freshwater | Etheostoma cragini |
| Kansu Loach | Cypriniformes | Freshwater | Triplophysa kansuensis |
| Kanthi Loach | Cypriniformes | Freshwater | Schistura Kanthi |
| Kanyakumari Loach | Cypriniformes | Freshwater | Schistura kanyakumariensis |
| Kao's Goatfish | Perciformes | Marine | Upeneus kaohsiungensis |
| Kao's Wrasse | Perciformes | Marine | Cirrhilabrus kaonoi |
| Kapala Grunt | Perciformes | Marine | Pomadasys kapala |
| Kapala Loach | Cypriniformes | Freshwater | Schistura kapalaensis |
| Kapenta | Clupeiformes | Freshwater | Limnothrissa miodon |
| Kaper Catshark | Carcharhiniformes | Marine | Atelomycterus Kaper |
| Kapoeta | Cypriniformes | Freshwater | Garra ethelwynnae |
| Kapuas Barb | Cypriniformes | Freshwater | Cyclocheilichthys armatus |
| Kapuas Catfish | Siluriformes | Freshwater | Hemibagrus nemurus |
| Kapuas Goby | Gobiiformes | Freshwater | Oligolepis kapuasensis |
| Kapuas Loach | Cypriniformes | Freshwater | Pangio kapuasensis |
| Kapuas River Barb | Cypriniformes | Freshwater | Puntius kapuasensis |
| Kapuas River Goby | Gobiiformes | Freshwater | Gnatholepis kapuasensis |
| Kapuas River Tiger Perch | Perciformes | Freshwater | Datnioides undecimradiatus |
| Kapuas Snakehead | Perciformes | Freshwater | Channa kapuasensis |
| Kapuas Stingaree | Myliobatiformes | Freshwater | Urolophus Kapuasensis |
| Kapulu Goby | Gobiiformes | Marine | Vanderhorstia kapulu |
| Kara Sea Skate | Rajiformes | Marine | Amblyraja Karasensis |
| Karabiner Snake Eel | Anguilliformes | Marine | Ophichthus karabini |
| Karachi Halfbeak | Beloniformes | Marine | Hyporhamphus balinensis |
| Karachi Tongue Sole | Pleuronectiformes | Marine | Cynoglossus arel |
| Karagan Trevally | Carangiformes | Marine | Carangoides praeustus |
| Karai Loach | Cypriniformes | Freshwater | Schistura Karai |
| Karaikal Goby | Gobiiformes | Brackish/Marine | Acentrogobius moloanus |
| Karaikal Threadfin Bream | Perciformes | Marine | Nemipterus peronii |
| Karakelong Rainbowfish | Atheriniformes | Freshwater | Melanotaenia Karakelong |
| Karaman Barb | Cypriniformes | Freshwater | Luciobarbus karamanensis |
| Karaman Goby | Gobiiformes | Marine | Gobius Karamanus |
| Karaman Loach | Cypriniformes | Freshwater | Schistura karamanensis |
| Karaman Stickleback | Gasterosteiformes | Freshwater | Gasterosteus karaman |
| Karambola | Perciformes | Marine | Caranx tille |
| Karamojo Cichlid | Cichliformes | Freshwater | Haplochromis karamojo |
| Karamojong Barb | Cypriniformes | Freshwater | Labeo Karamojong |
| Karanj Goby | Gobiiformes | Marine | Cryptocentrus Karanjensis |
| Karanja | Perciformes | Marine | Acanthurus nigricans |
| Karanje Loach | Cypriniformes | Freshwater | Nemacheilus Karanje |
| Karas | Cypriniformes | Freshwater | Carassius carassius |
| Karas Bluegill | Perciformes | Freshwater | Lepomis Karasensis |
| Karasu Loach | Cypriniformes | Freshwater | Oxynoemacheilus karasuensis |
| Karayar Loach | Cypriniformes | Freshwater | Schistura Karayar |
| Kardass | Perciformes | Marine | Sciaena Umbrina |
| Kareh Fish | Cypriniformes | Freshwater | Capoeta trutta |
| Karelin's Goby | Perciformes | Brackish | Pomatoschistus karelini |
| Karena Goby | Gobiiformes | Marine | Gobiopsis karena |
| Karenius Cichlid | Cichliformes | Freshwater | Thoracochromis karenius |
| Karewada Goby | Gobiiformes | Marine | Discordipinna karewada |
| Kargil Loach | Cypriniformes | Freshwater | Triplophysa kargilensis |
| Kari Loach | Cypriniformes | Freshwater | Schmidgea karii |
| Kari's Anglerfish | Lophiiformes | Marine | Lophiodes karii |
| Kari's Barb | Cypriniformes | Freshwater | Enteromius kariae |
| Kariba Bream | Perciformes | Freshwater | Oreochromis mortimeri |
| Kariba Killifish | Cyprinodontiformes | Freshwater | Nothobranchius karibaensis |
| Kariba Sardine | Clupeiformes | Freshwater | Limnothrissa miodon |
| Kariba Tigerfish | Characiformes | Freshwater | Hydrocynus vittatus |
| Kariba Tilapia | Cichliformes | Freshwater | Oreochromis mortimeri |
| Karimanjabi | Perciformes | Freshwater | Serranochromis macrocephalus |
| Karimeen | Perciformes | Brackish/Freshwater | Etroplus suratensis |
| Karimganj Loach | Cypriniformes | Freshwater | Schistura alii |
| Karimui Goby | Gobiiformes | Freshwater | Sicyopus karimui |
| Karin Loach | Cypriniformes | Freshwater | Schistura fasciata |
| Karisia Barb | Cypriniformes | Freshwater | Puntius karisiaensis |
| Karisia Loach | Cypriniformes | Freshwater | Schistura karisiaensis |
| Kariya Loach | Cypriniformes | Freshwater | Yunnanilus kariya |
| Karkala Loach | Cypriniformes | Freshwater | Schistura Karkalensis |
| Karkaria Killifish | Cyprinodontiformes | Freshwater | Nothobranchius karkariaensis |
| Karluk Flathead | Scorpaeniformes | Marine | Platycephalus karlukae |
| Karma Killerfish | Cyprinodontiformes | Freshwater | Nothobranchius karma |
| Karma Loach | Cypriniformes | Freshwater | Nemacheilus Karma |
| Karmali Barb | Cypriniformes | Freshwater | Puntius Karmalis |
| Karman's Cardinalfish | Perciformes | Marine | Apogon karmanae |
| Karmayogi Scraper | Cypriniformes | Freshwater | Garra Karmayogi |
| Karnali Loach | Cypriniformes | Freshwater | Schistura karnaliensis |
| Karnali Snowtrout | Cypriniformes | Freshwater | Schizothorax Karnaliensis |
| Karnatak Barb | Cypriniformes | Freshwater | Puntius karnatakensis |
| Karnataka Barb | Cypriniformes | Freshwater | Puntius sahyadriensis |
| Karnataki Loach | Cypriniformes | Freshwater | Homaloptera santhamalia |
| Karp | Cypriniformes | Freshwater lakes and rivers worldwide | Cyprinus carpio |
| Karpa Char | Salmoniformes | Freshwater | Salvelinus malma krascheninnikova |
| Karpathos Barbel | Cypriniformes | Freshwater | Squalius malacostoma |
| Karpov's Skate | Rajiformes | Marine | Bathyraja Karpovi |
| Kartabo Goby | Gobiiformes | Freshwater | Sicydium kartabo |
| Kartscher's Catshark | Carcharhiniformes | Marine | Parmaturus kartscheri |
| Karu River Killifish | Cyprinodontiformes | Freshwater | Nothobranchius karuchensis |
| Karubian Goby | Gobiiformes | Marine | Gobiodon karubiarum |
| Karumba Goby | Gobiiformes | Brackish | Redigobius karumba |
| Karun Barb | Cypriniformes | Freshwater | Luciobarbus karunensis |
| Karun Loach | Cypriniformes | Freshwater | Nemacheilus Karunensis |
| Karun River Trout | Salmoniformes | Freshwater | Salmo Karuni |
| Karun Tilapia | Cichliformes | Freshwater | Tilapia Karunensis |
| Karwar Goby | Gobiiformes | Brackish/Freshwater | Stigmatogobius Karwarensis |
| Kasai Killifish | Cyprinodontiformes | Freshwater | Hypsopanchax katolo |
| Kasai Mouthbrooder | Perciformes | Freshwater | Tylochromis kasai |
| Kashgar Loach | Cypriniformes | Freshwater | Triplophysa stoliczkai |
| Kashinath's Loach | Cypriniformes | Freshwater | Nemacheilus kashinathii |
| Kashiwazaki Scad | Carangiformes | Marine | Decapterus Kashiwazakii |
| Kashiwazaki Scorpionfish | Scorpaeniformes | Marine | Plectrogenium kanaya |
| Kashmir Loach | Cypriniformes | Freshwater | Triplophysa kashmirensis |
| Kasigau Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kasigauensis |
| Kasilao Loach | Cypriniformes | Freshwater | Pangio Kasilaoensis |
| Kasim Scraper | Cypriniformes | Freshwater | Garra Kasim |
| Kasio Goby | Gobiiformes | Marine | Gobius koumansi |
| Kassala Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kassalaensis |
| Kassala Loach | Cypriniformes | Freshwater | Triplophysa kassalensis |
| Kassang River Goby | Gobiiformes | Freshwater | Stenogobius kassangensis |
| Kasseler Loach | Cypriniformes | Freshwater | Cobitis kasseleri |
| Kasu Loach | Cypriniformes | Freshwater | Schistura kasuensis |
| Kasumiga Goby | Gobiiformes | Freshwater | Rhinogobius katsuyamae |
| Kat River Barb | Cypriniformes | Freshwater | Enteromius capensis |
| Kat River Killifish | Cyprinodontiformes | Freshwater | Nothobranchius katrivensis |
| Kata Goby | Gobiiformes | Marine | Obliquogobius kata |
| Kataja Loach | Cypriniformes | Freshwater | Schistura kataja |
| Katakuchi Iwashi | Clupeiformes | Marine | Engraulis japonicus |
| Katakuchi-Iwashi | Clupeiformes | Marine | Engraulis Japonica |
| Katala | Perciformes | Freshwater | Lates microlepis |
| Katala Loach | Cypriniformes | Freshwater | Schistura katala |
| Katanga Happy | Perciformes | Freshwater | Haplochromis katangae |
| Katanga Loach | Cypriniformes | Freshwater | Schistura katangaensis |
| Katawa | Perciformes | Freshwater | Lates mariae |
| Katha Loach | Cypriniformes | Freshwater | Schistura Katha |
| Kathar Loach | Cypriniformes | Freshwater | Schistura katha |
| Kathar's Goby | Gobiiformes | Marine | Oxyurichthys kathar |
| Kathleena's Sweeper | Perciformes | Marine | Pempheris kathleenae |
| Kati | Perciformes | Marine | Caranx ignobilis |
| Katihar Loach | Cypriniformes | Freshwater | Schistura katiharensis |
| Katka Loach | Cypriniformes | Freshwater | Schistura Katkaensis |
| Katla | Cypriniformes | Freshwater | Catla catla |
| Katong Goby | Gobiiformes | Brackish/Marine | Gobiopterus chuno |
| Katpadi Loach | Cypriniformes | Freshwater | Nemacheilus olivaceus |
| Katsala Goby | Gobiiformes | Marine | Gobius katsalae |
| Katsue's Cardinalfish | Perciformes | Marine | Apogon Katsui |
| Katsuo | Scombriformes | Marine | Katsuwonus pelamis |
| Katsura Goby | Perciformes | Freshwater | Rhinogobius katsurae |
| Katsura River Loach | Cypriniformes | Freshwater | Rhinogobius katsurae |
| Katsura Scad | Carangiformes | Marine | Trachurus Katsurai |
| Katsuwonus pelamis | Scombriformes | Marine | Katsuwonus pelamis |
| Katwal Loach | Cypriniformes | Freshwater | Schistura katwali |
| Katyper Loach | Cypriniformes | Freshwater | Triplophysa katyper |
| Kaua'i Brotula | Ophidiiformes | Marine | Brotula kaufmanni |
| Kauffman's Shark | Carcharhiniformes | Marine | Carcharhinus galapagensis |
| Kaufmann's Goby | Perciformes | Marine | Gobius kaufmanni |
| Kaufmann's Wormfish | Gobiiformes | Marine | Paragunnellichthys kaufmanni |
| Kaup's Mullet | Mugiliformes | Marine | Mugil kaupuensis |
| Kauzmann Goby | Gobiiformes | Marine | Amblygobius pholegandros |
| Kavali | Perciformes | Freshwater | Lates mariae |
| Kavali Loach | Cypriniformes | Freshwater | Schistura Kavaliensis |
| Kavango Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kavangoensis |
| Kavikali Loach | Cypriniformes | Freshwater | Schistura kavikali |
| Kavirondo Haplo | Perciformes | Freshwater | Haplochromis kavirondoensis |
| Kawai's Gurnard | Scorpaeniformes | Marine | Pterygotrigla Kawai |
| Kawaka Loach | Cypriniformes | Freshwater | Schistura kawakaensis |
| Kawakawa | Scombriformes | Tropical and subtropical Indo-Pacific oceans | Euthynnus affinis |
| Kawali Goby | Gobiiformes | Marine | Gobiopsis bravoi |
| Kawama Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kawamaensis |
| Kawamukai Loach | Cypriniformes | Freshwater | Rhinogobius kawamurai |
| Kawanga Tilapia | Cichliformes | Freshwater | Oreochromis kawangazi |
| Kawanishi's Goby | Gobiiformes | Marine | Callogobius Kawanishii |
| Kawara Goby | Gobiiformes | Brackish/Marine | Acentrogobius viridipunctatus |
| Kawari Barbel | Cypriniformes | Freshwater | Barbus barbus |
| Kawasaki's Goby | Gobiiformes | Marine | Trimmatom Kawasakii |
| Kawase's Goby | Perciformes | Freshwater | Rhinogobius kawasumii |
| Kawase's Surgeonfish | Acanthuriformes | Marine | Acanthurus Kawasei |
| Kawashiri's Triplefin Blenny | Perciformes | Marine | Enneapterygius kawasushii |
| Kaya Loach | Cypriniformes | Freshwater | Schistura kayah |
| Kayah Loach | Cypriniformes | Freshwater | Schistura kayah |
| Kayama's Blenny | Blenniiformes | Marine | Entomacrodus Kayamae |
| Kayangel Goby | Gobiiformes | Marine | Eviota Kayangelensis |
| Kayar Goby | Gobiiformes | Marine | Coryogalops kayar |
| Kayar Loach | Cypriniformes | Freshwater | Nemacheilus Kayarensis |
| Kaye's Goby | Gobiiformes | Marine | Priolepis kayae |
| Kayla's Dragonet | Perciformes | Marine | Synchiropus Kaylae |
| Kazakh Loach | Cypriniformes | Freshwater | Triplophysa kaznakowi |
| Kazakh Sturgeon | Acipenseriformes | Freshwater/Brackish | Acipenser nudiventris |
| Kazakhstani Loach | Cypriniformes | Freshwater | Triplophysa kazakhstanica |
| Kazamba Loach | Cypriniformes | Freshwater | Schistura Kazambica |
| Kazan Cod | Gadiformes | Marine | Gadus morhua |
| Kazenga Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kazengaensis |
| Kaznakov's Goby | Gobiiformes | Marine | Gobius Kaznakovi |
| Kbira Shark | Carcharhiniformes | Marine | Carcharhinus maou |
| Kea Chromis | Perciformes | Marine | Chromis kea |
| Kea Goby | Gobiiformes | Marine | Eviota Kea |
| Keay's Dragonet | Perciformes | Marine | Synchiropus keayi |
| Kebang Loach | Cypriniformes | Freshwater | Nemacheilus Kebangensis |
| Kedian Carp | Cypriniformes | Freshwater | Procypris Kedianensis |
| Kedong's Glassfish | Perciformes | Freshwater | Chanda Kedongi |
| Keel-bellied Sardine | Clupeiformes | Marine | Ethmalosa fimbriata |
| Keel-scaled Pipefish | Syngnathiformes | Marine | Corythoichthys ocellatus |
| Keeling Triggerfish | Tetraodontiformes | Marine | Sufflamen bursa |
| Keelung Goby | Gobiiformes | Freshwater | Sicyopus discordipinnis |
| Keelung Loach | Cypriniformes | Freshwater | Formosania keelungensis |
| Keen's Goby | Gobiiformes | Marine | Gobulus crescentalis |
| Keen's Perchlet | Perciformes | Marine | Ambassis keeni |
| Keene's Moray | Anguilliformes | Marine | Gymnothorax keenei |
| Keer's Loach | Cypriniformes | Freshwater | Schistura rupecula |
| Keewee | Perciformes | Marine | Pristigenys Keewee |
| Kei Archerfish | Perciformes | Freshwater/Brackish | Toxotes lorentzi |
| Kei Cardinalfish | Perciformes | Marine | Apogon keiensis |
| Kei Pipefish | Syngnathiformes | Marine | Corythoichthys keiensis |
| Kei Searobin | Scorpaeniformes | Marine | Satyrichthys keiensis |
| Keikai Loach | Cypriniformes | Freshwater | Schistura keikai |
| Keiko's Blenny | Blenniiformes | Marine | Omobranchus Keikoae |
| Keilback Minnow | Cypriniformes | Freshwater | Hemiculter leucisculus |
| Keiser's Barb | Cypriniformes | Freshwater | Puntius Keiseri |
| Keith's pipefish | Syngnathiformes | Marine | Corythoichthys keithi |
| Kekekia | Perciformes | Marine | Kekekia Scleropterygius |
| Kekuta Loach | Cypriniformes | Freshwater | Schistura kekutana |
| Kelaart's Moray | Anguilliformes | Marine | Gymnothorax kelaartii |
| Kelantan Loach | Cypriniformes | Freshwater | Schistura kottelati |
| Kelantan Snapper | Perciformes | Marine | Lutjanus kelantanensis |
| Kelat River Catfish | Siluriformes | Freshwater | Glyptothorax Kelat |
| Kelberi Peacock Bass | Cichliformes | Freshwater | Cichla kelberi |
| Kelei Shark | Carcharhiniformes | Marine | Carcharhinus cautus |
| Kelema Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kelemaensis |
| Kelenk Loach | Cypriniformes | Freshwater | Schistura Kelenk |
| Keletu Cichlid | Cichliformes | Freshwater | Ptychochromis keletu |
| Kelle's Brotula | Ophidiiformes | Marine | Brotula kelleyi |
| Keller's Goby | Gobiiformes | Marine | Gobius kelleri |
| Kellogg's Porgy | Spariformes | Marine | Calamus Kelloggii |
| Kelly's Goby | Perciformes | Marine | Gobiodon kelleyi |
| Kelly's Wrasse | Perciformes | Marine | Halichoeres Kellyi |
| Kelp Bass | Perciformes | Kelp forests along the California coast | Paralabrax clathratus |
| Kelpfish | Perciformes | Marine | Heterostichus rostratus |
| Kelung's Snapper | Perciformes | Marine | Lutjanus kasmira |
| Kemaman Halfbeak | Beloniformes | Brackish/Marine | Zenarchopterus Kemamanensis |
| Kemaman Loach | Cypriniformes | Freshwater | Schistura kemamanensis |
| Kemp's Catfish | Siluriformes | Freshwater | Mystus menoni |
| Kemp's Goby | Gobiiformes | Marine | Gobius kempingi |
| Kempana Barb | Cypriniformes | Freshwater | Puntius campbelli |
| Kempsell's Barb | Cypriniformes | Freshwater | Labeo Kempselli |
| Kenana Loach | Cypriniformes | Freshwater | Schistura Kenanaensis |
| Kendal's Moray | Anguilliformes | Marine | Gymnothorax kendalli |
| Kendall's Flashlight Fish | Anomalopiformes | Marine | Anomalops katoptron |
| Kendall's Goby | Gobiiformes | Marine | Gobulus kendalli |
| Kendall's Searobin | Scorpaeniformes | Marine | Prionotus Kendallii |
| Kendari Loach | Cypriniformes | Freshwater | Schistura kendari |
| Kendu-Kenduri Loach | Cypriniformes | Freshwater | Schistura kendurik |
| Keng's Loach | Cypriniformes | Freshwater | Lefua kengii |
| Kenga Loach | Cypriniformes | Freshwater | Schistura Kengaensis |
| Kengcheng Loach | Cypriniformes | Freshwater | Triplophysa kengchengensis |
| Kenkatakuchi | Clupeiformes | Marine | Engraulis Kenkatakuchi |
| Kennicott's Sculpin | Scorpaeniformes | Marine | Myoxocephalus Kennicottii |
| Kensakou-Iwashi | Clupeiformes | Marine | Sardinella Kensakou |
| Kent Lake Pupfish | Cyprinodontiformes | Freshwater | Cyprinodon diaboli |
| Kentish Glory | Gadiformes | Marine | Gadus morhua |
| Kentish Red Mullet | Perciformes | Marine | Mullus surmuletus |
| Kentucky Darner | Perciformes | Freshwater | Etheostoma atripinne |
| Kenya Barb | Cypriniformes | Freshwater | Enteromius anema |
| Kenya Barracuda | Scombriformes | Marine | Sphyraena barracuda |
| Kenyatta Cichlid | Cichliformes | Freshwater | Xystichromis phytophagus |
| Keong's Goby | Gobiiformes | Marine | Istigobius keongae |
| Keonjhar Loach | Cypriniformes | Freshwater | Schistura keonjharica |
| Kepala Goby | Gobiiformes | Marine | Amblyeleotris novaecaledoniae |
| Kepala Pipefish | Syngnathiformes | Marine | Corythoichthys isabelae |
| Keralasensis Loach | Cypriniformes | Freshwater | Nemacheilus keralensis |
| Kerama Goby | Gobiiformes | Marine | Gobiodon keramaensis |
| Kerinci Loach | Cypriniformes | Freshwater | Schistura kerricus |
| Keris | Perciformes | Coral reefs in the Indo-Pacific | Acanthurus mata |
| Kerkennah Goby | Gobiiformes | Marine | Pomatoschistus knipowitschi |
| Kerkini Minnow | Cypriniformes | Freshwater | Pelasgus Kerkiniensis |
| Kermadec Cod | Gadiformes | Marine | Gadus merlangus |
| Kermadec Flounder | Pleuronectiformes | Marine | Ammotretis Kermadecensis |
| Kermadec Moray | Anguilliformes | Marine | Gymnothorax kermadecensis |
| Kermadec Sole | Pleuronectiformes | Marine | Peltorhamphus novaezeelandiae |
| Kerner's Catfish | Siluriformes | Freshwater | Pimelodus microstoma |
| Kerns Sculpin | Scorpaeniformes | Freshwater | Cottus kernensis |
| Kerr's Goby | Gobiiformes | Marine | Gobius Kerr |
| Kerri Barb | Cypriniformes | Freshwater | Enteromius kerri |
| Kerri Goby | Gobiiformes | Marine | Callogobius keenani |
| Kerrich's Carp-Gudgeon | Gobiiformes | Freshwater | Mogurnda Kerrichae |
| Kerriella | Cypriniformes | Freshwater | Kerriella exanthemata |
| Kerstin's Goby | Gobiiformes | Marine | Eviota Kerstinae |
| Kessinger's Darter | Perciformes | Freshwater | Etheostoma swaini |
| Kessler's Goby | Gobiiformes | Freshwater/Brackish | Ponticola kessleri |
| Kessler's Loach | Cypriniformes | Freshwater | Sabanejewia kessleri |
| Keswick Pipefish | Syngnathiformes | Marine | Syngnathus caretta |
| Keta Salmon | Salmoniformes | Freshwater/Marine | Oncorhynchus keta |
| Ketapang Mudskipper | Gobiiformes | Brackish/Marine | Boleophthalmus Ketapangensis |
| Ketong Loach | Cypriniformes | Freshwater | Schistura ketongii |
| Kew Goby | Gobiiformes | Marine | Coryphopterus alloides |
| Kewpie Goby | Gobiiformes | Marine | Discordipinna griessingeri |
| Key West Damselfish | Perciformes | Marine | Stegastes pictus |
| Key-West Grunt | Perciformes | Marine | Haemulon macrostomum |
| Keyhole Angelfish | Perciformes | Marine | Centropyge Keyhole |
| Keyhole Cichlid | Perciformes | Freshwater | Cleithracara maronii |
| Keyhole Wrasse | Perciformes | Marine | Coris Keyhole |
| Keystone Goby | Gobiiformes | Marine | Gnatholepis cauerensis |
| Khabarovsk Loach | Cypriniformes | Freshwater | Triplophysa gruberi |
| Khadi | Cypriniformes | Freshwater | Labeo pangasia |
| Khaffan Loach | Cypriniformes | Freshwater | Nemacheilus Khaffan |
| Khakhra Loach | Cypriniformes | Freshwater | Schistura khakhraensis |
| Khalaf's Loach | Cypriniformes | Freshwater | Oxynoemacheilus khalafi |
| Khalatbari's Loach | Cypriniformes | Freshwater | Nemacheilus Khalatbarianus |
| Khan Loach | Cypriniformes | Freshwater | Triplophysa khanensis |
| Khan's Loach | Cypriniformes | Freshwater | Schistura khanae |
| Khandek Loach | Cypriniformes | Freshwater | Triplophysa khandek |
| Khanna's Tetra | Characiformes | Freshwater | Hyphessobrycon khanna |
| Khanoum Scraper | Cypriniformes | Freshwater | Garra Khanoum |
| Khanpur Loach | Cypriniformes | Freshwater | Schistura khankana |
| Khao Lae | Cypriniformes | Freshwater | Hypsibarbus pierrei |
| Khao Laem Botia | Cypriniformes | Freshwater | Botia khaolamensis |
| Khao Phanom Kraben Loach | Cypriniformes | Freshwater | Schistura khaophanomkrabenensis |
| Khao Sam Roi Yot Loach | Cypriniformes | Freshwater | Schistura khaosanroiyotensis |
| Khao Sok Loach | Cypriniformes | Freshwater | Schistura khaosokensis |
| Khao Yai Loach | Cypriniformes | Freshwater | Schistura khaoyaiensis |
| Khapra | Cypriniformes | Freshwater rivers in India and Southeast Asia | Labeo rohita |
| Khartoum Catfish | Siluriformes | Freshwater | Synodontis schall |
| Khasan Loach | Cypriniformes | Freshwater | Triplophysa khasanensis |
| Khasi Blind Loach | Cypriniformes | Freshwater | Nemacheilus kaimuri |
| Khasi Loach | Cypriniformes | Freshwater | Triplophysa khasiensis |
| Khasia Loach | Cypriniformes | Freshwater | Schistura Khasia |
| Khasias Barb | Cypriniformes | Freshwater | Puntius Khasiensis |
| Khasis Loach | Cypriniformes | Freshwater | Schistura khasinensis |
| Khatoon's Loach | Cypriniformes | Freshwater | Triplophysa khatooni |
| Khatooni Loach | Cypriniformes | Freshwater | Nemacheilus Khatooni |
| Khaur Loach | Cypriniformes | Freshwater | Nemacheilus Khaur |
| Khaw Loach | Cypriniformes | Freshwater | Triplophysa khuatsoni |
| Khawr Abd Allah Eel | Anguilliformes | Brackish/Marine | Anguilla Khawryi |
| Khera's Loach | Cypriniformes | Freshwater | Schistura Kheraensis |
| Kheri Loach | Cypriniformes | Freshwater | Schistura savona |
| Khmer Loach | Cypriniformes | Freshwater | Syncrossus khmerensis |
| Khoi Barb | Cypriniformes | Freshwater | Puntius khohi |
| Khoi Loach | Cypriniformes | Freshwater | Triplophysa khoii |
| Khor Loach | Cypriniformes | Freshwater | Schistura khorasanensis |
| Khorasan Loach | Cypriniformes | Freshwater | Nemacheilus Khorasanensis |
| Khorassan Barb | Cypriniformes | Freshwater | Carasobarbus kosswigi |
| Khorat Loach | Cypriniformes | Freshwater | Acanthopsoides rothi |
| Khorixas Killifish | Cyprinodontiformes | Freshwater | Nothobranchius Khorixasensis |
| Khosrawi Loach | Cypriniformes | Freshwater | Nemacheilus Khosrawi |
| Khubani Loach | Cypriniformes | Freshwater | Schistura khubani |
| Khulna Glassfish | Perciformes | Freshwater | Chanda Khulnensis |
| Khumbu Loach | Cypriniformes | Freshwater | Triplophysa khumbuensis |
| Khumbu Trout | Salmoniformes | Freshwater | Salmo Khumbuensis |
| Khuwaja Barb | Cypriniformes | Freshwater | Puntius hampi |
| Khyber Scraper | Cypriniformes | Freshwater | Garra Khyberensis |
| Kiamichi Shiner | Cypriniformes | Freshwater | Notropis Kiamachensis |
| Kiangsu Loach | Cypriniformes | Freshwater | Sinogastromyzon puliensis |
| Kiasu Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kiasuensis |
| Kiatabong Loach | Cypriniformes | Freshwater | Schistura kiatabongi |
| Kibar Loach | Cypriniformes | Freshwater | Schistura kibarensis |
| Kiboga Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kibogaensis |
| Kibong Goby | Gobiiformes | Freshwater/Brackish | Sicyopterus stimpsoni |
| Kibonge Goby | Gobiiformes | Freshwater | Rhyacichthys guilberti |
| Kid's Goby | Gobiiformes | Marine | Gobius kidi |
| Kidepo Barb | Cypriniformes | Freshwater | Enteromius kidepo |
| Kidney Spot Barb | Cypriniformes | Freshwater | Puntius arulius |
| Kiehn's Goby | Gobiiformes | Marine | Bryaninops kiehnii |
| Kien Giang Loach | Cypriniformes | Freshwater | Schistura kiengiangensis |
| Kiener's Goby | Gobiiformes | Marine | Gobius Kieneri |
| Kiener's Pipefish | Syngnathiformes | Marine | Micrognathus richardi |
| Kienle Scraper | Cypriniformes | Freshwater | Garra Kienlei |
| Kiev Goldfish | Cypriniformes | Freshwater (domesticated) | Carassius auratus |
| Kigelia Cichlid | Cichliformes | Freshwater | Tilapia kigelia |
| Kigoma Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kigomaensis |
| Kihangara Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kihangaraensis |
| Kihansi Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kihansiensis |
| Kihansi Spinyfin | Beryciformes | Marine | Stomias boa boa |
| Kihikihi | Tetraodontiformes | Marine | Zanclus cornutus |
| Kiho Goby | Gobiiformes | Marine | Ecsenius kiho |
| Kijiki Goby | Gobiiformes | Marine | Amblyeleotris kijiki |
| Kikai Goby | Gobiiformes | Marine | Fusigobius duospilus |
| Kiko Damselfish | Perciformes | Marine | Pomacentrus kiko |
| Kikuchi's Flathead | Scorpaeniformes | Marine | Rogadius Kikuchii |
| Kikuchi's Goby | Gobiiformes | Marine | Gobiodon kikuchii |
| Kikuchi's Halfbeak | Beloniformes | Marine | Hyporhamphus kikuchii |
| Kikuchi's Loach | Cypriniformes | Freshwater | Schistura kikuchii |
| Kikuchi's Pipefish | Syngnathiformes | Marine | Corythoichthys kikuchii |
| Kikuyu Shark | Carcharhiniformes | Marine | Carcharhinus falciformis |
| Kilakarai Loach | Cypriniformes | Freshwater | Schistura Kilakaraiensis |
| Kilauea Loach | Cypriniformes | Freshwater | Triplophysa kilaueaenis |
| Kilemba Loach | Cypriniformes | Freshwater | Nemacheilus Kilembaensis |
| Kilifi Eel | Anguilliformes | Marine | Gymnothorax kilifi |
| Kilifi Goby | Gobiiformes | Marine | Chiramenu goby |
| Kilifi Tilapia | Perciformes | Freshwater | Tilapia ruweti |
| Kilimanjaro Barb | Cypriniformes | Freshwater | Enteromius nummifer |
| Kilimanjaro Barbel | Cypriniformes | Freshwater | Labeobarbus kimberleyensis |
| Kilimanjaro Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kilimanjaroensis |
| Kilimanjaro Mouthbrooder | Cichliformes | Freshwater | Oreochromis Kilimanjaro |
| Kilimanjaro Tilapia | Cichliformes | Freshwater | Tilapia Kilimanjaro |
| Kilimi Tilapia | Cichliformes | Freshwater | Oreochromis kilimami |
| Killifish | Cyprinodontiformes | Freshwater/Brackish | Fundulus heteroclitus |
| Kilombero Barb | Cypriniformes | Freshwater | Enteromius kilomberoensis |
| Kimbe Damselfish | Perciformes | Marine | Pomacentrus kimbe |
| Kimberley Anchovy | Clupeiformes | Marine | Thryssa scratchleyi |
| Kimberley Archerfish | Perciformes | Freshwater | Toxotes Kimberleyensis |
| Kimberley Diamondfish | Perciformes | Marine | Terapon jarbua |
| Kimberley Goby | Gobiiformes | Marine | Gobiodon Kimberley |
| Kimberley Grunter | Perciformes | Freshwater | Leiopotherapon macrolepis |
| Kimberley Mullet | Mugiliformes | Marine | Mugil cephalus |
| Kimberley Whipray | Myliobatiformes | Marine | Himantura Kimberleyensis |
| Kimito Loach | Cypriniformes | Freshwater | Schistura kimitoi |
| Kimolos Goby | Gobiiformes | Marine | Gobius kimolosensis |
| Kinabalu Minnow | Cypriniformes | Freshwater | Gastromyzon Kinabaluensis |
| Kinabalu Shark Catfish | Siluriformes | Freshwater | Panaq Kinabaluensis |
| Kinabalu Spiny Eel | Synbranchiformes | Freshwater | Macrognathus Kinabaluensis |
| Kinabalu Tor | Cypriniformes | Freshwater | Tor Kinabaluensis |
| Kinabatangan Goby | Gobiiformes | Freshwater | Batoidea Kinabatangan |
| Kincaid's Sculpin | Scorpaeniformes | Freshwater | Cottus Kincaidii |
| Kinda Loach | Cypriniformes | Freshwater | Triplophysa kindaer |
| King Angelfish | Perciformes | Marine | Holacanthus passer |
| King Barracuda | Perciformes | Marine | Sphyraena barracuda |
| King Coralfish | Perciformes | Marine | Chaetodon auriga |
| King Croaker | Perciformes | Marine | Menticirrhus undulatus |
| King Demoiselle | Perciformes | Marine | Neoglyphidodon nigroris |
| King Dottyback | Perciformes | Marine | Pseudochromis kralji |
| King Garra | Cypriniformes | Freshwater | Garra Kingi |
| King George Whiting | Perciformes | Marine | Sillaginodes punctata |
| King Goby | Gobiiformes | Marine | Gobius Kingi |
| King Mackerel | Scombriformes | Marine | Scomberomorus cavalla |
| King Mullet | Mugiliformes | Marine | Mugil curema |
| King Neptune's Perch | Perciformes | Marine | Trudis Rex |
| King Perch | Perciformes | Freshwater/Brackish/Marine | Lates calcarifer |
| King Salmon | Salmoniformes | Anadromous | Oncorhynchus tshawytscha |
| King Scad | Perciformes | Marine | Scomberomorus niphonius |
| King Scallop Swellshark | Carcharhiniformes | Marine | Cephaloscyllium Königii |
| King Threadfin | Polynemiformes | Marine | Polynemus sheridani |
| King Vun's Loach | Cypriniformes | Freshwater | Schistura kingvuni |
| King of Denmark | Ophidiiformes | Marine | Brotula barbata |
| King of the Herrings | Gadiformes | Marine | Molva molva |
| King of the Mackerels | Scombriformes | Marine | Scomberomorus regalis |
| King of the Salmons | Salmoniformes | Freshwater/Marine | Oncorhynchus tshawytscha |
| King's Darter | Perciformes | Freshwater | Etheostoma Kingi |
| King's Whiting | Perciformes | Marine | Sillaginodes punctata |
| King-clip | Ophidiiformes | Marine | Genypterus capensis |
| Kingfish | Perciformes | Marine | Scomberomorus commerson |
| Kingfish (Australian) | Carangiformes | Marine | Seriola lalandi |
| Kingfish (various species across orders) | Perciformes | Marine | Often Genus Scomberomorus |
| Kingiak | Perciformes | Marine/Brackish | Platichthys stellatus |
| Kingklip (various species) | Ophidiiformes | Marine | Genypterus |
| Kinglet | Perciformes | Marine (Colloquial for certain oarfish) | Regalecus russellii |
| Kingsley's Cichlid | Cichliformes | Freshwater | Tilapia kingleyi |
| Kingsley's Pipefish | Syngnathiformes | Marine | Corythoichthys Kingsleyae |
| Kingston Sculpin | Cottoidei | Freshwater | Cottus kingsleyi |
| Kinmen Loach | Cypriniformes | Freshwater | Schistura Kinmenensis |
| Kinnaman Pipefish | Syngnathiformes | Marine | Syngnathus kinnamanis |
| Kino Goby | Gobiiformes | Marine | Trimmatom macropus |
| Kinoshita's Damselfish | Perciformes | Marine | Pomacentrus kinoshitae |
| Kinoshita's Flounder | Pleuronectiformes | Marine | Pleuronectes kinoshitae |
| Kinoshita's Goby | Gobiiformes | Marine | Paragunnellichthys kinoshitae |
| Kinoshita's Loach | Cypriniformes | Freshwater | Rhinogobius kinoshitae |
| Kinoshita's Scorpionfish | Scorpaeniformes | Marine | Scorpaena kinoshitae |
| Kinoshita's Sculpin | Scorpaeniformes | Marine | Myoxocephalus brandtii |
| Kinshasa Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kinshasaensis |
| Kinsler's Goby | Gobiiformes | Marine | Gobiosoma kinslerae |
| Kintaka Loach | Cypriniformes | Freshwater | Nemacheilus Kintaka |
| Kinubuna | Cypriniformes | Freshwater | Carassius auratus buergeri |
| Kiosan Loach | Cypriniformes | Freshwater | Schistura Kiosanensis |
| Kipang Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kipangensis |
| Kipungu Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kipunguensis |
| Kira Goby | Gobiiformes | Marine | Vanderhorstia kira |
| Kiribati Butterflyfish | Perciformes | Marine | Chaetodon ulietensis |
| Kiribati Goby | Gobiiformes | Marine | Fusigobius kiribati |
| Kirigamin Loach | Cypriniformes | Freshwater | Nemacheilus Kirigaminensis |
| Kirindy Threadfin | Polynemiformes | Marine | Polydactylus Kirindyensis |
| Kirishima Goby | Gobiiformes | Freshwater | Rhinogobius kirishima |
| Kiritimati Cardinalfish | Perciformes | Marine | Apogon kiritimati |
| Kirk's Blenny | Perciformes | Marine | Entomacrodus kirki |
| Kirk's Tilapia | Cichliformes | Freshwater | Tilapia kirkorum |
| Kirke Goby | Gobiiformes | Marine | Gobius kirki |
| Kirkii Catfish | Siluriformes | Freshwater | Amphilius kirki |
| Kirkwood's Loach | Cypriniformes | Freshwater | Schistura kirkwoodi |
| Kirmenica Loach | Cypriniformes | Freshwater | Cobitis taenia |
| Kirumi Loach | Cypriniformes | Freshwater | Triplophysa kirumiana |
| Kisangani Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kisanganiensis |
| Kishinoue's Velvetfish | Scorpaeniformes | Marine | Gyrinomimus kishinouei |
| Kishinoue's Wrasse | Perciformes | Marine | Symphodus Kishinouei |
| Kishore Loach | Cypriniformes | Freshwater | Nemacheilus kishorei |
| Kishore's Hill Trout | Cypriniformes | Freshwater | Barilius kishorei |
| Kishwar Loach | Cypriniformes | Freshwater | Triplophysa kishawarensis |
| Kisihirata-Hata | Perciformes | Marine | Epinephelus Kisihirata |
| Kiskadee Tetra | Characiformes | Freshwater | Hyphessobrycon Kiskadee |
| Kissing Gourami | Perciformes | Freshwater | Helostoma temminckii |
| Kissing Loach | Cypriniformes | Freshwater | Schistura Kissingensis |
| Kistna Loach | Cypriniformes | Freshwater | Schistura kistnae |
| Kitagami Loach | Cypriniformes | Freshwater | Oreias kitagamiensis |
| Kitagata Skate | Rajiformes | Marine | Okamejei Kitagata |
| Kitaibaragi Loach | Cypriniformes | Freshwater | Cobitis Kitaibaragi |
| Kitaibaraki Goby | Perciformes | Freshwater | Rhinogobius kitaibarakiensis |
| Kitakami Loach | Cypriniformes | Freshwater | Lefua Kitakamiensis |
| Kitakami River Minnow | Cypriniformes | Freshwater | Pseudorasbora Kitakami |
| Kitakamigawa Minnow | Cypriniformes | Freshwater | Pseudorasbora Kitakami |
| Kitakaze Goby | Gobiiformes | Marine | Amblyeleotris kitanago |
| Kitami Loach | Cypriniformes | Freshwater | Rhinogobius kurodae |
| Kitang | Tetraodontiformes | Marine | Arothron hispidus |
| Kitanglad Loach | Cypriniformes | Freshwater | Schistura kitangladensis |
| Kitatara Loach | Cypriniformes | Freshwater | Nemacheilus Kitatara |
| Kitawo | Perciformes | Marine | Platax pinnatus |
| Kitayama Loach | Cypriniformes | Freshwater | Rhinogobius katsurae |
| Kitayama's Pipefish | Syngnathiformes | Marine | Corythoichthys kitayamae |
| Kitefin Shark | Squaliformes | Deep waters worldwide | Dalatias licha |
| Kitefish | Perciformes | Marine | Ilisha melastoma |
| Kithul Loach | Cypriniformes | Freshwater | Nemacheilus Kithulensis |
| Kitina Goby | Gobiiformes | Marine | Stonogobiops kitina |
| Kitongo Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kitongoensis |
| Kitsilano Sculpin | Scorpaeniformes | Freshwater | Cottus Kitsilanoensis |
| Kitsune Goby | Gobiiformes | Marine | Obliquogobius kitsunei |
| Kittl | Cypriniformes | Freshwater | Opsariichthys bidens |
| Kitumbe Barb | Cypriniformes | Freshwater | Barboides kituwi |
| Kiunga Rainbowfish | Atheriniformes | Freshwater | Melanotaenia Kiunga |
| Kiva Loach | Cypriniformes | Freshwater | Triplophysa kivaensis |
| Kivu Sardine | Clupeiformes | Freshwater | Limnothrissa miodon |
| Kiwi Snapper | Perciformes | Coastal waters of New Zealand and Australia | Pagrus auratus |
| Kiyo's Goby | Gobiiformes | Marine | Eviota Kiyoshii |
| Kiyomizu Goby | Gobiiformes | Brackish/Freshwater | Gymnogobius Kiyomizuensis |
| Kiyomizu's Goby | Perciformes | Marine | Luciogobius kiyomizu |
| Kiyosato Loach | Cypriniformes | Freshwater | Lefua Kiyosatoensis |
| Kizakura Loach | Cypriniformes | Freshwater | Rhinogobius kizakura |
| Kizilirmak Loach | Cypriniformes | Freshwater | Oxynoemacheilus kizilirmakensis |
| Kizilirmak Minnow | Cypriniformes | Freshwater | Phoxinellus Kizilirmakensis |
| Klamath River Sculpin | Scorpaeniformes | Freshwater | Cottus klamathensis |
| Klamath Speckled Dace | Cypriniformes | Freshwater | Rhinichthys osculus klamathensis |
| Klamath Tui Chub | Cypriniformes | Freshwater | Gila bicolor klamathensis |
| Klapata Goby | Gobiiformes | Marine | Gobius Klapata |
| Klaus' Barb | Cypriniformes | Freshwater | Labeo Klausi |
| Klebergia | Perciformes | Marine | Scomberomorus klebergii |
| Klebsi's Loach | Cypriniformes | Freshwater | Triplophysa klebsi |
| Klemme's Goby | Gobiiformes | Marine | Hetereleotris Klemmeae |
| Klipfish | Blenniiformes | Marine | Clinus superciliosus |
| Kliprand Killifish | Cyprinodontiformes | Freshwater | Nothobranchius Kliprandensis |
| Knifefish | Osteoglossiformes | Freshwater in Asia and Africa | Notopterus notopterus |
| Knifetooth Dogfish | Squaliformes | Marine | Scymnodon ringens |
| Knight Goby | Gobiiformes | Brackish/Freshwater | Stigmatogobius sadanundio |
| Knightia | Clupeiformes | Fossil fish from the Eocene Green River Formation | Knightia eocaena |
| Knipovich's Sculpin | Scorpaeniformes | Marine | Myoxocephalus knipowitschi |
| Knobbed Porgy | Perciformes | Marine | Calamus nodosus |
| Knothead Parrotfish | Perciformes | Marine | Chlorurus strongylocephalus |
| Knysna Sandgoby | Gobiiformes | Marine | Psammogobius Knysnaensis |
| Knysna Seahorse | Syngnathiformes | Marine | Hippocampus Capensis |
| Ko's Goby | Gobiiformes | Marine | Bathygobius Koi |
| Kob | Perciformes | Coastal waters of the Indo-Pacific | Argyrosomus japonicus |
| Kobata Loach | Cypriniformes | Freshwater | Triplophysa kobataensis |
| Kobayashi's Scad | Carangiformes | Marine | Decapterus Kobayashii |
| Kobayashi's Slimehead | Beryciformes | Marine | Hoplostethus Kobayashii |
| Kobelt's Loach | Cypriniformes | Freshwater | Schistura Kobelti |
| Kobold Cichlid | Cichliformes | Freshwater | Neolamprologus kobelti |
| Koch's Goby | Perciformes | Marine | Gobius koideae |
| Koch's Loach | Cypriniformes | Freshwater | Schistura kochii |
| Koch's Pipefish | Syngnathiformes | Marine | Corythoichthys Kochii |
| Koch's Razorfish | Syngnathiformes | Marine | Centriscus kochii |
| Kochi Goby | Gobiiformes | Brackish/Freshwater | Gymnogobius Kochiensis |
| Kochi Loach | Cypriniformes | Freshwater | Schistura Kochiensis |
| Kodagu Loach | Cypriniformes | Freshwater | Schistura kodaguensis |
| Kodak Loach | Cypriniformes | Freshwater | Schistura kodadensis |
| Kodak Sea Serpent | Ophichthiformes | Marine | Leiuranus semicinctus |
| Koga Loach | Cypriniformes | Freshwater | Schistura kogaensis |
| Koga's Goby | Gobiiformes | Marine | Sueviota koga |
| Kogane Goby | Gobiiformes | Marine | Amblyeleotris kogane |
| Kogoro Goby | Gobiiformes | Marine | Istigobius kogoro |
| Kogure's Goby | Perciformes | Marine | Priolepis kogurei |
| Koh Chang Loach | Cypriniformes | Freshwater | Schistura kohchangensis |
| Koh Tao Cardinalfish | Perciformes | Marine | Apogon kohi |
| Koha Loach | Cypriniformes | Freshwater | Nemacheilus Koha |
| Kohaku | Cypriniformes | Freshwater ponds (ornamental variety) | Cyprinus carpio |
| Kohama's Goby | Gobiiformes | Marine | Cryptocentrus kohamai |
| Koheru | Perciformes | Marine | Seriola lalandi |
| Kohinoor Loach | Cypriniformes | Freshwater | Nemacheilus Kohinoor |
| Kohler's Goby | Gobiiformes | Marine | Stonogobiops kohleri |
| Kohli's Loach | Cypriniformes | Freshwater | Nemacheilus Kohli |
| Kohli's Searobin | Scorpaeniformes | Marine | Prionotus Kohlsi |
| Kohoutek's Goby | Gobiiformes | Marine | Eviota kohouteki |
| Koi | Cypriniformes | Freshwater | Cyprinus rubrofuscus |
| Koich Goby | Gobiiformes | Marine | Eviota koich |
| Koirala's Loach | Cypriniformes | Freshwater | Triplophysa koiralai |
| Koizumi's Goby | Perciformes | Marine | Gobius koizumii |
| Koka | Perciformes | Freshwater | Lates niloticus |
| Koka's Goby | Gobiiformes | Marine | Trimma kokan |
| Kokand Loach | Cypriniformes | Freshwater | Triplophysa kokandensis |
| Kokanee | Salmoniformes | Freshwater lakes and rivers in North America | Oncorhynchus nerka kennerlyi |
| Kokanee Salmon | Salmoniformes | Freshwater | Oncorhynchus nerka |
| Kokcha Loach | Cypriniformes | Freshwater | Nemacheilus kokonungus |
| Koke Lake Sculpin | Scorpaeniformes | Freshwater | Cottus Kokeensis |
| Koki Loach | Cypriniformes | Freshwater | Schistura Koki |
| Kokinum Loach | Cypriniformes | Freshwater | Schistura kokinumaensis |
| Koko's Killifish | Cyprinodontiformes | Freshwater | Nothobranchius Kokonao |
| Kokoda Goby | Gobiiformes | Freshwater | Glossogobius Kokoda |
| Kokoda Loach | Cypriniformes | Freshwater | Schistura kokodaensis |
| Kokopu | Osmeriformes | Freshwater | Galaxias argenteus |
| Kolaba Loach | Cypriniformes | Freshwater | Nemacheilus kolabensis |
| Kolad Loach | Cypriniformes | Freshwater | Schistura koladensis |
| Kolapore Frogfish | Lophiiformes | Marine | Antennarius kolapore |
| Kolapore Loach | Cypriniformes | Freshwater | Nemacheilus Kolaporensis |
| Kolathur Goby | Gobiiformes | Brackish/Freshwater | Stigmatogobius Kolathurensis |
| Kolenati's Loach | Cypriniformes | Freshwater | Triplophysa kolenatii |
| Kolhapur Loach | Cypriniformes | Freshwater | Nemacheilus kolhapur |
| Koli's Goby | Gobiiformes | Marine | Gobius Koli |
| Koli's Loach | Cypriniformes | Freshwater | Nemacheilus Kolii |
| Kolkata Loach | Cypriniformes | Freshwater | Schistura kolkataensis |
| Kolkwitz's Loach | Cypriniformes | Freshwater | Nemacheilus kolkwitzii |
| Koller's Goby | Gobiiformes | Marine | Gobius Kolleri |
| Kollur Goby | Gobiiformes | Brackish/Marine | Acentrogobius Kollur |
| Kololi Goby | Gobiiformes | Freshwater | Glossogobius kololi |
| Kolong Loach | Cypriniformes | Freshwater | Triplophysa kolongensis |
| Kolyma Whitefish | Salmoniformes | Freshwater | Coregonus kolymensis |
| Kome's Goby | Gobiiformes | Marine | Eviota kome |
| Komo | Perciformes | Freshwater | Lates mariae |
| Komodo Dragonet | Perciformes | Marine | Synchiropus Komodoensis |
| Komodo Goby | Gobiiformes | Marine | Pleurosicya komodoensis |
| Kompong Thom Barb | Cypriniformes | Freshwater | Puntius kompongthomsis |
| Kon Chu Ray Loach | Cypriniformes | Freshwater | Schistura konchurayaensis |
| Kon Tum Goby | Gobiiformes | Freshwater | Schismatogobius marmoratus |
| Kona Loach | Cypriniformes | Freshwater | Nemacheilus konadaensis |
| Konaganalli Scraper | Cypriniformes | Freshwater | Garra Konaganalli |
| Konarak Loach | Cypriniformes | Freshwater | Schistura Konarakensis |
| Konark Loach | Cypriniformes | Freshwater | Nemacheilus konarkensis |
| Konda Barb | Cypriniformes | Freshwater | Puntius kondaensis |
| Konda Loach | Cypriniformes | Freshwater | Schistura konda |
| Kondana | Perciformes | Freshwater | Serranochromis stappersi |
| Kondang Loach | Cypriniformes | Freshwater | Pangio cuneovirgata |
| Kondao Triplefin | Blenniiformes | Marine | Copocentra koala |
| Kondapalli Loach | Cypriniformes | Freshwater | Nemacheilus kondapallii |
| Konde Lizardfish | Aulopiformes | Marine | Synodus konde |
| Konder's Loach | Cypriniformes | Freshwater | Schistura konderi |
| Kondool Loach | Cypriniformes | Freshwater | Schistura kondool |
| Kondoz Loach | Cypriniformes | Freshwater | Nemacheilus kondozensis |
| Kone Pipefish | Syngnathiformes | Marine | Corythoichthys flavofasciatus |
| Koneprusy Goby | Perciformes | Brackish | Gobius koneprusyensis |
| Koneprusy Loach | Cypriniformes | Freshwater | Cobitis koneprusyi |
| Kong Loach | Cypriniformes | Freshwater | Schistura kongkandensis |
| Kong Shark | Lamniformes | Marine (Goblin Shark is more common name) | Mitsukurina owstoni |
| Kong's Loach | Cypriniformes | Freshwater | Nemacheilus Kongi |
| Konga | Perciformes | Freshwater | Lates niloticus |
| Kongju Loach | Cypriniformes | Freshwater | Koreocobitis kongjuensis |
| Kongo Goby | Gobiiformes | Marine | Eviota kongo |
| Kongola | Perciformes | Freshwater | Oreochromis macrochir |
| Konia Barb | Cypriniformes | Freshwater | Enteromius konianensis |
| Konjo Goby | Gobiiformes | Marine | Istigobius konjo |
| Konkan Loach | Cypriniformes | Freshwater | Schistura konkanensis |
| Konkon | Perciformes | Marine/Brackish | Lates calcarifer |
| Konku Stream Loach | Cypriniformes | Freshwater | Schistura konkukensis |
| Kono's Goby | Perciformes | Freshwater | Gymnogobius konoi |
| Kontum Loach | Cypriniformes | Freshwater | Schistura kontumensis |
| Kookaburra Cod | Perciformes | Freshwater rivers in Australia | Maccullochella peelii |
| Koolie Loach | Cypriniformes | Freshwater | Pangio kuhlii |
| Koon's Goby | Gobiiformes | Marine | Eviota koonsi |
| Koorin Goby | Gobiiformes | Marine | Coryphopterus koorin |
| Kopang | Perciformes | Freshwater | Oreochromis macrochir |
| Koper Goby | Gobiiformes | Marine | Gobius koperensis |
| Kopetdag Loach | Cypriniformes | Freshwater | Oxynoemacheilus kopepdagensis |
| Kopp's Loach | Cypriniformes | Freshwater | Triplophysa koppi |
| Kopri Goby | Gobiiformes | Marine | Eviota kopri |
| Kopytnikova's Loach | Cypriniformes | Freshwater | Triplophysa kopytnykovae |
| Korat Barb | Cypriniformes | Freshwater | Puntius partipentazona |
| Korat Loach | Cypriniformes | Freshwater | Schistura koratensis |
| Korbus Loach | Cypriniformes | Freshwater | Nemacheilus korbus |
| Kordofan Goby | Gobiiformes | Marine | Gobius kordofanensis |
| Korea Flyingfish | Beloniformes | Marine | Cheilopogon koreaensis |
| Korea Goby | Gobiiformes | Marine | Gobius Coreanus |
| Korean Bitterling | Cypriniformes | Freshwater | Rhodeus Uyekii |
| Korean Halibut | Pleuronectiformes | Coastal waters of the Northwest Pacific | Paralichthys olivaceus |
| Korean Loach | Cypriniformes | Freshwater | Koreocobitis Koreanus |
| Korean Loach (alternative) | Cypriniformes | Freshwater | Misgurnus mizolepis |
| Korean Perch | Perciformes | Freshwater | Coreoperca herzi |
| Korean Rockfish | Scorpaeniformes | Marine | Sebastes koreanus |
| Korean Shark | Carcharhiniformes | Marine | Chimaera koreana |
| Korhogo Loach | Cypriniformes | Freshwater | Schistura korhogoensis |
| Kori's Goby | Perciformes | Marine | Amblyeleotris kori |
| Korimudu Barb | Cypriniformes | Freshwater | Puntius korimudu |
| Koriya Loach | Cypriniformes | Freshwater | Nemacheilus koriensis |
| Korolkow's Loach | Cypriniformes | Freshwater | Triplophysa korolkowi |
| Koromo's Dragonet | Perciformes | Marine | Callionymus koromoi |
| Koror Loach | Cypriniformes | Freshwater | Schistura Kororensis |
| Kororo Goby | Gobiiformes | Marine | Amblyeleotris koumansi |
| Korumdu Loach | Cypriniformes | Freshwater | Triplophysa korumduensis |
| Koryak Mudfish | Cyprinodontiformes | Freshwater rivers in Siberia | Phoxinus koryakensis |
| Kose's Goby | Perciformes | Marine | Luciogobius koseensis |
| Kosi Rockcod | Perciformes | Marine | Epinephelus coioides |
| Kosrae Goby | Gobiiformes | Marine | Stonogobiops nematodes |
| Kossati's Loach | Cypriniformes | Freshwater | Triplophysa kossati |
| Kossi Loach | Cypriniformes | Freshwater | Nemacheilus kossi |
| Kosugi's Tripod Fish | Aulopiformes | Marine | Bathypterois kosugii |
| Kotka Loach | Cypriniformes | Freshwater | Schistura kotkaensis |
| Kotra Loach | Cypriniformes | Freshwater | Nemacheilus Kotraensis |
| Kottayam Loach | Cypriniformes | Freshwater | Nemacheilus kottelat |
| Kottelat's Barb | Cypriniformes | Freshwater | Puntius kottelati |
| Kottelat's Rasbora | Cypriniformes | Freshwater | Rasbora kottelati |
| Kottha Loach | Cypriniformes | Freshwater | Schistura Kottha |
| Kotuwa Barb | Cypriniformes | Freshwater | Puntius srilankensis |
| Kotzebue Loach | Cypriniformes | Freshwater | Triplophysa kotzebuei |
| Kou Goby | Gobiiformes | Marine | Gobius Kou |
| Kou's Anchovy | Clupeiformes | Marine | Thrissa koumansi |
| Kouga Loach | Cypriniformes | Freshwater | Nemacheilus kougaensis |
| Kouilou Loach | Cypriniformes | Freshwater | Nemacheilus kouilouensis |
| Koumac Skate | Rajiformes | Marine | Dipturus endeavouri |
| Koumans' Goby | Gobiiformes | Marine | Gobius Koumansi |
| Koumans' Pipefish | Syngnathiformes | Marine | Hippichthys koumansi |
| Koumans' Pugmy Goby | Perciformes | Marine | Trimmatom koumansi |
| Koumans' Worm Goby | Gobiiformes | Brackish/Marine | Brachyamblyopus Koumansi |
| Kovalam Barb | Cypriniformes | Freshwater | Puntius kovalamensis |
| Kovalam Loach | Cypriniformes | Freshwater | Schistura Kovalamensis |
| Kovalam Pipefish | Syngnathiformes | Marine | Corythoichthys kovalama |
| Kovda Loach | Cypriniformes | Freshwater | Triplophysa kovaeae |
| Kowi | Siluriformes | Freshwater | Hemibagrus nemurus |
| Kowloon Loach | Cypriniformes | Freshwater | Microphysogobio kowloonensis |
| Koy's Loach | Cypriniformes | Freshwater | Schistura koyai |
| Koya Goby | Gobiiformes | Marine | Eviota koya |
| Koya Loach | Cypriniformes | Freshwater | Nemacheilus koyaensis |
| Koyanagi's Flyingfish | Beloniformes | Marine | Cheilopogon Koyanagii |
| Koyu Loach | Cypriniformes | Freshwater | Nemacheilus Koyuensis |
| Kozaki Loach | Cypriniformes | Freshwater | Nemacheilus kozakii |
| Kozima's Goby | Gobiiformes | Marine | Cryptocentrus kozima |
| Kozlov's Loach | Cypriniformes | Freshwater | Nemacheilus Kozlovi |
| Kozuka's Goby | Gobiiformes | Brackish/Freshwater | Gymnogobius Kozukai |
| Krabi Mudskipper | Gobiiformes | Brackish/Marine | Boleophthalmus Krabiensis |
| Krah's Killifish | Cyprinodontiformes | Freshwater | Nothobranchius Krahi |
| Kralendijk Toadfish | Batrachoidiformes | Marine | Opsanus krabbenhoefti |
| Kramer's Loach | Cypriniformes | Freshwater | Triplophysa krameri |
| Kranji Goby | Gobiiformes | Marine | Vanderhorstia kranji |
| Kranji Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kranjiensis |
| Krasnodar Loach | Cypriniformes | Freshwater | Cobitis krasnodarensis |
| Krasnov's Loach | Cypriniformes | Freshwater | Triplophysa krasnovi |
| Krasnozhen's Goby | Gobiiformes | Freshwater | Sicyopterus krasnozheni |
| Krauss's Goby | Gobiiformes | Marine | Gobius kraussii |
| Krauss's Pipefish | Syngnathiformes | Marine | Lissocampus kraussi |
| Krefft's Catshark | Carcharhiniformes | Marine | Apristurus kreffti |
| Krefft's Goby | Gobiiformes | Marine | Gnatholepis kreffti |
| Krefft's Pipefish | Syngnathiformes | Marine | Corythoichthys kreffti |
| Krempf's Loach | Cypriniformes | Freshwater | Schistura krempfi |
| Krempf's Pipefish | Syngnathiformes | Marine | Ichthyocampus krempfi |
| Krempf's Wrasse | Perciformes | Marine | Halichoeres krempfi |
| Kreuiter's Goby | Gobiiformes | Marine | Pleurosicya kreuiteri |
| Kribensis | Cichliformes | Freshwater rivers in West Africa | Pelvicachromis pulcher |
| Kribi Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kribiensis |
| Kribi Loach | Cypriniformes | Freshwater | Schistura kribiensis |
| Krishna Perch | Perciformes | Freshwater | Chanda nama |
| Krista's Loach | Cypriniformes | Freshwater | Triplophysa krista |
| Kroc's Triplefin Blenny | Perciformes | Marine | Enneapterygius krocma |
| Kroeyer's Gasterosteus | Gasterosteiformes | Freshwater | Gasterosteus kroyeri |
| Kroh Tiger Barb | Cypriniformes | Freshwater | Puntigrus anchispiroxilosus |
| Kruyswijk's Loach | Cypriniformes | Freshwater | Triplophysa kruyswijkii |
| Ku-Min Loach | Cypriniformes | Freshwater | Triplophysa kumminensis |
| Kuah Loach | Cypriniformes | Freshwater | Schistura kuah |
| Kuala Lampan Loach | Cypriniformes | Freshwater | Nemacheilus selangoricus |
| Kuantan Loach | Cypriniformes | Freshwater | Schistura kuantanensis |
| Kubare Goby | Gobiiformes | Marine | Trimma kubare |
| Kuber's Loach | Cypriniformes | Freshwater | Triplophysa kuberi |
| Kubota's Goby | Perciformes | Marine | Priolepis kubotae |
| Kubuna | Cypriniformes | Freshwater | Carassius auratus buergeri |
| Kuchi Loach | Cypriniformes | Freshwater | Triplophysa kuchi |
| Kuching Loach | Cypriniformes | Freshwater | Nemacheilus kuchingensis |
| Kudal Loach | Cypriniformes | Freshwater | Nemacheilus kudal |
| Kuduk Goby | Gobiiformes | Brackish | Pseudogobius kuduk |
| Kueh's Loach | Cypriniformes | Freshwater | Schistura kuehni |
| Kuhl's Loach | Cypriniformes | Freshwater | Pangio kuhlii |
| Kuhl's Stingray | Myliobatiformes | Marine | Neotrygon kuhlii |
| Kuhlia | Perciformes | Freshwater streams in the Indo-Pacific | Kuhlia rupestris |
| Kukri Catfish | Siluriformes | Freshwater | Olyra kempi |
| Kukri Loach | Cypriniformes | Freshwater | Triplophysa kukri |
| Kukuru Fish | Perciformes | Marine | Dules auriga |
| Kulala Loach | Cypriniformes | Freshwater | Schistura kulalensiss |
| Kulambu | Perciformes | Freshwater | Oreochromis sp. 'Kulambu' |
| Kuloli Goby | Gobiiformes | Freshwater | Glossogobius kuloli |
| Kulon Loach | Cypriniformes | Freshwater | Triplophysa kulonensis |
| Kulon Progo Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kulonprogoensis |
| Kulu Loach | Cypriniformes | Freshwater | Nemacheilus kuluensis |
| Kului | Perciformes | Marine | Epinephelus areolatus |
| Kumagai's Goby | Gobiiformes | Marine | Paratrypauchen kumagaii |
| Kumakuma | Scorpaeniformes | Freshwater rivers in Japan | Cottus nozawai |
| Kumamoto Goby | Gobiiformes | Freshwater | Rhinogobius giurinus |
| Kumanan's Snake Eel | Anguilliformes | Marine | Pisodonophis kumananae |
| Kumaon Loach | Cypriniformes | Freshwater | Nemacheilus kumaonensis |
| Kumasi Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kumasiensis |
| Kumasi Loach | Cypriniformes | Freshwater | Schistura kumasiensis |
| Kumbar Loach | Cypriniformes | Freshwater | Nemacheilus kumbar |
| Kumbarayil Loach | Cypriniformes | Freshwater | Schistura kumbarayli |
| Kumbaro | Perciformes | Freshwater | Serranochromis macrocephalus |
| Kumbharia Loach | Cypriniformes | Freshwater | Schistura kumbharia |
| Kumejima Goby | Gobiiformes | Marine | Trimma kumejima |
| Kumgang Loach | Cypriniformes | Freshwater | Nemacheilus kumgangsanensis |
| Kuminga Killifish | Cyprinodontiformes | Freshwater | Nothobranchius kumingaensis |
| Kumul Goby | Gobiiformes | Marine | Trimma kumul |
| Kuna Goby | Gobiiformes | Marine | Eviota koppi |
| Kunashiri Skate | Rajiformes | Marine | Okamejei kunashirica |
| Kunchin Loach | Cypriniformes | Freshwater | Triplophysa kunchinensis |
| Kundal Loach | Cypriniformes | Freshwater | Nemacheilus kundali |
| Kundavaram Loach | Cypriniformes | Freshwater | Schistura kundavaramensis |
| Kunduchi Goby | Gobiiformes | Marine | Acentrogobius kunduchi |
| Kungfu Panda Loach | Cypriniformes | Freshwater streams in Southeast Asia | Pangio cuneavirgata |
| Kuni | Salmoniformes | Freshwater | Oncorhynchus masou ishikawae |
| Kuni's Goby | Gobiiformes | Marine | Sueviota kunea |
| Kunkun | Perciformes | Marine/Brackish | Lates calcarifer |
| Kunlun Loach | Cypriniformes | Freshwater | Triplophysa kunlunensis |
| Kunming Loach | Cypriniformes | Freshwater | Triplophysa kungmingensis |
| Kuntai Loach | Cypriniformes | Freshwater | Schistura kuntai |
| Kuo's Goby | Perciformes | Freshwater | Rhinogobius kuoi |
| Kupang Mudskipper | Gobiiformes | Brackish/Marine | Periophthalmus modestus |
| Kupang Snapper | Lutjaniformes | Coral reefs of the Indo-Pacific | Lutjanus fulvus |
| Kura Barb | Cypriniformes | Freshwater | Alburnoides kurui |
| Kurdistan Killifish | Cyprinodontiformes | Freshwater/Brackish | Aphanius mento |
| Kurdistan Loach | Cypriniformes | Freshwater | Oxynoemacheilus kurdistanicus |
| Kure's Goby | Gobiiformes | Marine | Eviota kure |
| Kuredu's Pipefish | Syngnathiformes | Marine | Halicampus kurenbachii |
| Kuri Loach | Cypriniformes | Freshwater | Nemacheilus kurichan |
| Kurihashi Loach | Cypriniformes | Freshwater | Rhinogobius kurihashi |
| Kurihashi's Goby | Perciformes | Freshwater | Rhinogobius kurihashii |
| Kurihashi's Pipefish | Syngnathiformes | Marine | Corythoichthys kurihashi |
| Kuril Goby | Gobiiformes | Marine | Amblyeleotris kurilensis |
| Kuril Mudfish | Cyprinodontiformes | Freshwater rivers in the Kuril Islands | Phoxinus kurilensis |
| Kuril Skate | Rajiformes | Marine | Bathyraja curvirostris |
| Kurland Goby | Gobiiformes | Marine | Gobius kurlandiae |
| Kuro Loach | Cypriniformes | Freshwater | Nemacheilus kuroiwae |
| Kuroda's Goby | Perciformes | Freshwater | Rhinogobius kurodae |
| Kuroda's Loach | Cypriniformes | Freshwater | Triplophysa kurodae |
| Kurofune Goby | Gobiiformes | Marine | Akihito hoshinoi |
| Kurohime Goby | Gobiiformes | Marine | Trimma kurohime |
| Kurohira Loach | Cypriniformes | Freshwater | Rhinogobius kurohira |
| Kuroshima Frogfish | Lophiiformes | Marine | Antennarius kuroshima |
| Kuroshio Loach | Cypriniformes | Freshwater | Triplophysa kuroshioensis |
| Kurper | Cichliformes | Freshwater lakes and rivers in Southern Africa | Tilapia sparrmanii |
| Kurtus | Perciformes | Marine | Kurtus indicus |
| Kurume Loach | Cypriniformes | Freshwater | Nemacheilus kurumeensis |
| Kusa Spotfin Mojarra | Perciformes | Marine | Gerres equulus |
| Kusa-ayu | Osmeriformes | Freshwater | Plecoglossus altivelis |
| Kusaie Goby | Gobiiformes | Marine | Trimma yanoi |
| Kusan Goby | Gobiiformes | Marine | Trimma kusan |
| Kusatsu Goby | Perciformes | Freshwater | Rhinogobius kusatsuensis |
| Kushan Loach | Cypriniformes | Freshwater | Triplophysa kushani |
| Kushimoto Goby | Gobiiformes | Marine | Amblygobius phalaena |
| Kushtia Loach | Cypriniformes | Freshwater | Nemacheilus kushtiai |
| Kuskokwim Sculpin | Scorpaeniformes | Freshwater | Myoxocephalus platycephalus |
| Kusu | Perciformes | Marine/Brackish | Lates calcarifer |
| Kusumi's Goby | Perciformes | Marine | Macrodontogobius kusumi |
| Kusuri's Loach | Cypriniformes | Freshwater | Triplophysa kusuri |
| Kutaisi Loach | Cypriniformes | Freshwater | Cobitis kutaisiensis |
| Kutan Loach | Cypriniformes | Freshwater | Schistura kutanensis |
| Kutei Goby | Gobiiformes | Freshwater | Stenogobius kutei |
| Kuttanad Loach | Cypriniformes | Freshwater | Schistura kuttanadensis |
| Kutum | Cypriniformes | Freshwater | Rutilus kutum |
| Kuu Goby | Perciformes | Marine | Trimmatom kuuae |
| Kuwabara's Goby | Gobiiformes | Marine | Amblyeleotris kuwabarakoi |
| Kuwahara's Goby | Gobiiformes | Marine | Gobius kuwaharai |
| Kuyper's Goby | Gobiiformes | Freshwater/Brackish | Stigmatogobius kuyperi |
| Kuznetsov's Loach | Cypriniformes | Freshwater | Nemacheilus kuznetsovi |
| Kwama | Perciformes | Freshwater | Lates mariae |
| Kwando Barb | Cypriniformes | Freshwater | Enteromius paludinosus |
| Kwangsi Loach | Cypriniformes | Freshwater | Schistura kwangsiensis |
| Kwangtung Loach | Cypriniformes | Freshwater | Triplophysa kwangtungensis |
| Kwazulu Goby | Gobiiformes | Estuaries in South Africa | Oxyurichthys microlepis |
| Kwazulu Wrasse | Perciformes | Marine (Not very common usage) | Symphodus rostratus |
| Kweichow Loach | Cypriniformes | Freshwater | Schistura kweichowensis |
| Kwikwi | Siluriformes | Freshwater | Clarias gariepinus |
| Kyakatu | Perciformes | Freshwater | Lates mariae |
| Kyeema | Perciformes | Freshwater | Lates mariae |
| Kyodo Loach | Cypriniformes | Freshwater | Triplophysa kyodoensis |
| Kyoga Mouthbrooder | Perciformes | Freshwater | Haplochromis nuchisquamulatus |
| Kyrgyz Loach | Cypriniformes | Freshwater | Triplophysa kyrgyzensis |
| Kyushu Goby | Perciformes | Freshwater | Rhinogobius kyushuensis |
| Kyushu Loach | Cypriniformes | Freshwater | Nemacheilus九州 |
| Kyzylkum Stone Loach | Cypriniformes | Freshwater | Nemacheilus kryzhanovskii |