There are 789 fish that start with the letter R, from Rabauld’s pipefish to Rylstone goby. 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: Rabauld's pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys ocellatus
Name: Rabbitfish
Order: Siganiformes
Habitat: Coral reefs and seagrass beds
Scientific name: Siganus rivulatus
Name: Rabble-rouser wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Cirrhilabrus labontei
Name: Raccoon butterflyfish
Order: Perciformes
Habitat: Coral reefs
Scientific name: Chaetodon lunula
Name: Racoon butterflyfish
Order: Perciformes
Habitat: Marine
Scientific name: Chaetodon lunula
Name: Raddled grunt
Order: Perciformes
Habitat: Marine
Scientific name: Pomadasys opercularis
Name: Raddled grunter
Order: Perciformes
Habitat: Freshwater
Scientific name: Amniataba percoidea
Name: Radiant parrotfish
Order: Perciformes
Habitat: Marine
Scientific name: Sparisoma radians
Name: Radiant razorfish
Order: Perciformes
Habitat: Sandy bottoms of coral reefs
Scientific name: Iniistius radiatus
Name: Radiant wrasse
Order: Perciformes
Habitat: Coral reefs
Scientific name: Halichoeres radiatus
Name: Radiated shanny
Order: Perciformes
Habitat: Marine
Scientific name: Ulvaria subbifurcata
Name: Radiated snake eel
Order: Anguilliformes
Habitat: Marine
Scientific name: Myrichthys colubrinus
Name: Radical Moray
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax radicalis
Name: Radioactive blenny
Order: Perciformes
Habitat: Marine
Scientific name: Acanthemblemaria aspera
Name: Raggard sculpin
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Icelus rastrinoides
Name: Ragged-fin triggerfish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Sufflamen verres
Name: Ragged-tooth Shark
Order: Lamniformes
Habitat: Marine
Scientific name: Odontaspis ferox
Name: Ragged-tooth shark
Order: Orectolobiformes
Habitat: Marine
Scientific name: Odontaspis ferox
Name: Raggie
Order: Orectolobiformes
Habitat: Marine
Scientific name: Odontaspis taurus
Name: Rah rah blenny
Order: Perciformes
Habitat: Marine
Scientific name: Ecsenius yaeyamaensis
Name: Rainbow Cichlid
Order: Cichliformes
Habitat: Freshwater
Scientific name: Herotilapia multispinosa
Name: Rainbow Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Stonogobiops rainbowi
Name: Rainbow Runner
Order: Carangiformes
Habitat: Marine
Scientific name: Elagatis bipinnulata
Name: Rainbow Trout
Order: Salmoniformes
Habitat: Freshwater/Brackish
Scientific name: Oncorhynchus mykiss
Name: Rainbow chub
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Opsariichthys uncirostris
Name: Rainbow darter
Order: Perciformes
Habitat: Freshwater streams
Scientific name: Etheostoma caeruleum
Name: Rainbow runner
Order: Carangiformes
Habitat: Marine
Scientific name: Elagatis bipinnulata
Name: Rainbow sardine
Order: Clupeiformes
Habitat: Marine
Scientific name: Dussumieria acuta
Name: Rainbow smelt
Order: Osmeriformes
Habitat: Coastal marine and freshwater lakes
Scientific name: Osmerus mordax
Name: Rainbow wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Halichoeres pictus
Name: Rainbowfish
Order: Atheriniformes
Habitat: Freshwater streams and lakes
Scientific name: Melanotaeniidae
Name: Rainbownose shark
Order: Carcharhiniformes
Habitat: Marine
Scientific name: Carcharhinus obsolerus
Name: Raja belangeri
Order: Rajiformes
Habitat: Marine
Scientific name: Raja belangeri
Name: Raja binoculata
Order: Rajiformes
Habitat: Marine
Scientific name: Beringraja binoculata
Name: Raja clavata
Order: Rajiformes
Habitat: Marine
Scientific name: Raja clavata
Name: Raja eglanteria
Order: Rajiformes
Habitat: Marine
Scientific name: Raja eglanteria
Name: Raja radiata
Order: Rajiformes
Habitat: Marine
Scientific name: Amblyraja radiata
Name: Rajah Brooke's pipefish
Order: Syngnathiformes
Habitat: Marine and estuarine
Scientific name: Syngnathus rajabrookei
Name: Rajah's tang
Order: Perciformes
Habitat: Marine
Scientific name: Acanthurus nigricans
Name: Rakali
Order: Rodentia
Habitat: Freshwater (often mistaken for fish)
Scientific name: Hydromys chrysogaster
Name: Rakery Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Amblyeleotris rakan
Name: Ram cichlid
Order: Cichliformes
Habitat: Freshwater
Scientific name: Mikrogeophagus ramirezi
Name: Ram-horned helmetfish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Scorpaenopsis ramaraoi
Name: Rambosa Catfish
Order: Siluriformes
Habitat: Freshwater
Scientific name: Pimelodella ramirezi
Name: Ramirez's dwarf cichlid
Order: Perciformes
Habitat: Freshwater
Scientific name: Apistogramma ramirezi
Name: Ramora
Order: Perciformes
Habitat: Marine
Scientific name: Echeneis naucrates
Name: Ramsay's trevally
Order: Carangiformes
Habitat: Marine
Scientific name: Carangoides ramsayi
Name: Randall's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Amblyeleotris randalli
Name: Randall's Wrasse
Order: Labriformes
Habitat: Marine
Scientific name: Cirrhilabrus randalli
Name: Randall's frogfish
Order: Lophiiformes
Habitat: Marine
Scientific name: Antennarius randalli
Name: Randall's goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Amblyeleotris randalli
Name: Randall's snapper
Order: Perciformes
Habitat: Marine
Scientific name: Lutjanus randall
Name: Randall's wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Halichoeres randalli
Name: Ranee snapper
Order: Perciformes
Habitat: Deep reefs
Scientific name: Pristipomoides amoenus
Name: Raney's sand stargazer
Order: Perciformes
Habitat: Marine
Scientific name: Dactylagnus parvus
Name: Rangiroa damselfish
Order: Perciformes
Habitat: Marine
Scientific name: Pomacentrus rangiroae
Name: Ranzani's beaked whale
Order: Cetartiodactyla
Habitat: Deep offshore waters
Scientific name: Mesoplodon europaeus
Name: Ranzania
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Ranzania laevis
Name: Rapa Nui moray eel
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax bathyphilum
Name: Raphael catfish
Order: Siluriformes
Habitat: Freshwater
Scientific name: Platydoras armatulus
Name: Rapp's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gnatholepis rappi
Name: Rasbora
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rasbora borapetensis
Name: Rasbora caudimaculata
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rasbora caudimaculata
Name: Rasbora caverii
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rasbora caverii
Name: Rasbora cephalotaenia
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rasbora cephalotaenia
Name: Rasbora daniconius
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rasbora daniconius
Name: Rasbora dorsiocellata
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rasbora dorsiocellata
Name: Rasbora einthovenii
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rasbora einthovenii
Name: Rasbora elegans
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rasbora elegans
Name: Rasbora heteromorpha
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Trigonostigma heteromorpha
Name: Rasbora kalochroma
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rasbora kalochroma
Name: Rasbora sumatrana
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rasbora sumatrana
Name: Rasbora trilineata
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rasbora trilineata
Name: Rasbora vaterifloris
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rasbora vaterifloris
Name: Raspbelly drum
Order: Perciformes
Habitat: Marine
Scientific name: Umbrina coroides
Name: Raspberry basslet
Order: Perciformes
Habitat: Coral reefs
Scientific name: Gramma melacara
Name: Raspberry damselfish
Order: Perciformes
Habitat: Marine
Scientific name: Pomacentrus alleni
Name: Raspy moray
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax verrucosus
Name: Raspy scorpionfish
Order: Channichthyiformes
Habitat: Marine
Scientific name: Gymnapistes marmoratus
Name: Raster goby
Order: Gobiiformes
Habitat: Coral reefs and sandy bottoms
Scientific name: Gnatholepis anjeriana
Name: Rastrelliger
Order: Perciformes
Habitat: Marine
Scientific name: Rastrelliger kanagurta
Name: Rastrelliger mackerel
Order: Scombriformes
Habitat: Tropical and subtropical Indo-Pacific
Scientific name: Rastrelliger
Name: Rastrojosa goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius xanthocephalus
Name: Rat-tail
Order: Gadiformes
Habitat: Marine (Family of deep-sea fish)
Scientific name: Macrouridae
Name: Rat-tailed Flounder
Order: Pleuronectiformes
Habitat: Freshwater/Brackish
Scientific name: Trinectes maculatus
Name: Rat-tailed dragonfish
Order: Stomiiformes
Habitat: Marine
Scientific name: Malacosteus niger
Name: Rat-tailed grenadier
Order: Gadiformes
Habitat: Marine
Scientific name: Coryphaenoides rupestris
Name: Ratfish
Order: Chimaeriformes
Habitat: Deep marine
Scientific name: Hydrolagus colliei
Name: Rather Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Meiacanthus crinitus
Name: Rattail
Order: Gadiformes
Habitat: Marine
Scientific name: Macrouridae
Name: Rattail blenny
Order: Perciformes
Habitat: Marine
Scientific name: Pteroscirtes variabilis
Name: Rattlesnake fish
Order: Aulopiformes
Habitat: Marine
Scientific name: Talismania bifurcata
Name: Rattlesnake moray
Order: Anguilliformes
Habitat: Marine
Scientific name: Muraena clepsydra
Name: Raukawa hapuku
Order: Perciformes
Habitat: Marine
Scientific name: Polyprion oxygeneios
Name: Raven croaker
Order: Perciformes
Habitat: Marine
Scientific name: Umbrina roncador
Name: Raven hawkfish
Order: Perciformes
Habitat: Marine
Scientific name: Cyprinocirrhites polyactis
Name: Raven's Hook-nosed Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Phyllopteryx taeniolatus
Name: Ravenfish
Order: Batrachoidiformes
Habitat: Marine
Scientific name: Batrachoides grunniens
Name: Ray's sea catfish
Order: Siluriformes
Habitat: Marine
Scientific name: Ariopsis raysi
Name: Rayed pearlfish
Order: Ophidiiformes
Habitat: Commensal in sea cucumbers
Scientific name: Carapus bermudensis
Name: Rays bream
Order: Perciformes
Habitat: Deep marine
Scientific name: Brama brama
Name: Razor ribbonfish
Order: Lampriformes
Habitat: Marine
Scientific name: Eumecichthys fiski
Name: Razor wrasse
Order: Perciformes
Habitat: Marine (Also Razorfish)
Scientific name: Iniistius novacula
Name: Razorback sucker
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Xyrauchen texanus
Name: Razorfine catfish
Order: Siluriformes
Habitat: Freshwater
Scientific name: Pimelodus floridai
Name: Razorfish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Aeoliscus strigatus
Name: Rebblenose moray
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax reevesae
Name: Rebblenose pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys ocellatus
Name: Reckoning wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Bodianus opercularis
Name: Red Barb
Order: Cypriniformes
Habitat: Freshwater streams and rivers
Scientific name: Barbodes semifasciolatus
Name: Red Irish lord
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Hemilepidotus hemilepidotus
Name: Red Sea Clownfish
Order: Perciformes
Habitat: Marine
Scientific name: Amphiprion bicinctus
Name: Red Sea Goatfish
Order: Perciformes
Habitat: Marine
Scientific name: Parupeneus forsskali
Name: Red Sea Mimic Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Plagiotremus tapeinosoma
Name: Red Sea Riffle Fish
Order: Cyprinodontiformes
Habitat: Freshwater/Brackish
Scientific name: Aphanius dispar
Name: Red Sea Sohal Surgeonfish
Order: Acanthuriformes
Habitat: Marine
Scientific name: Acanthurus sohal
Name: Red Sea Whiptail
Order: Perciformes
Habitat: Marine
Scientific name: Pentapodus emeryii
Name: Red Spotted Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Amblygobius phalaena
Name: Red Striped Hogfish
Order: Labriformes
Habitat: Marine
Scientific name: Bodianus rubrispina
Name: Red Swellshark
Order: Carcharhiniformes
Habitat: Marine
Scientific name: Cephaloscyllium expansum
Name: Red banded parrotfish
Order: Perciformes
Habitat: Marine
Scientific name: Sparisoma viride
Name: Red banded seabream
Order: Perciformes
Habitat: Marine
Scientific name: Pagrus auriga
Name: Red banded wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Halichoeres opercularis
Name: Red barracuda
Order: Perciformes
Habitat: Marine
Scientific name: Sphyraena pinguis
Name: Red bass
Order: Perciformes
Habitat: Marine
Scientific name: Lutjanus bohar
Name: Red bellied piranha
Order: Characiformes
Habitat: Freshwater
Scientific name: Pygocentrus nattereri
Name: Red cheek parrotfish
Order: Perciformes
Habitat: Marine
Scientific name: Sparisoma notatum
Name: Red cornetfish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Fistularia petimba
Name: Red devil cichlid
Order: Cichliformes
Habitat: Freshwater lakes
Scientific name: Amphilophus labiatus
Name: Red dot triggerfish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Canthidermis maculata
Name: Red drum
Order: Perciformes
Habitat: Estuaries and coastal marine
Scientific name: Sciaenops ocellatus
Name: Red emperor
Order: Perciformes
Habitat: Marine
Scientific name: Lutjanus sebae
Name: Red emperor snapper
Order: Perciformes
Habitat: Coral reefs
Scientific name: Lutjanus sebae
Name: Red eyed piranha
Order: Characiformes
Habitat: Freshwater
Scientific name: Serrasalmus rhombeus
Name: Red fantail darter
Order: Perciformes
Habitat: Freshwater
Scientific name: Etheostoma flabellare
Name: Red filament wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Paracheilinus filamentosus
Name: Red fin fusilier
Order: Perciformes
Habitat: Marine
Scientific name: Pterocaesio digramma
Name: Red finned parrotfish
Order: Perciformes
Habitat: Marine
Scientific name: Sparisoma taeniopterum
Name: Red flounder
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Pseudopleuronectes americanus
Name: Red grouper
Order: Perciformes
Habitat: Reefs and rocky bottoms
Scientific name: Epinephelus morio
Name: Red groupers
Order: Perciformes
Habitat: Marine
Scientific name: Epinephelus morio
Name: Red hind
Order: Perciformes
Habitat: Marine
Scientific name: Epinephelus guttatus
Name: Red hogfish
Order: Perciformes
Habitat: Marine
Scientific name: Lachnolaimus maximus
Name: Red horse minnow
Order: Cypriniformes
Habitat: Freshwater streams and rivers
Scientific name: Moxostoma erythrurum
Name: Red irish lord
Order: Scorpaeniformes
Habitat: Coastal marine
Scientific name: Hemilepidotus hemilepidotus
Name: Red kingfish
Order: Perciformes
Habitat: Coral reefs and rocky bottoms
Scientific name: Priacanthus hamrur
Name: Red koi
Order: Cypriniformes
Habitat: Freshwater ponds and streams
Scientific name: Cyprinus rubrofuscus
Name: Red lionfish
Order: Scorpaeniformes
Habitat: Coral reefs
Scientific name: Pterois volitans
Name: Red lipped batfish
Order: Lophiiformes
Habitat: Marine
Scientific name: Ogcocephalus darwini
Name: Red lipped blenny
Order: Perciformes
Habitat: Marine
Scientific name: Ophioblennius atlanticus
Name: Red lizardfish
Order: Aulopiformes
Habitat: Marine
Scientific name: Synodus synodus
Name: Red mariana blenny
Order: Perciformes
Habitat: Marine
Scientific name: Cirripectes kuwamurai
Name: Red morwong
Order: Perciformes
Habitat: Marine
Scientific name: Cheilodactylus fuscus
Name: Red mullet
Order: Perciformes
Habitat: Marine
Scientific name: Mullus surmuletus
Name: Red mullett
Order: Perciformes
Habitat: Marine
Scientific name: Mullus surmuletus
Name: Red mulloway
Order: Perciformes
Habitat: Coastal estuarine waters
Scientific name: Argyrosomus japonicas
Name: Red pacu
Order: Characiformes
Habitat: Freshwater rivers and floodplains
Scientific name: Piaractus brachypomus
Name: Red pandora
Order: Perciformes
Habitat: Deep marine
Scientific name: Pagellus bogaraveo
Name: Red paperfish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Taenianotus triacanthus
Name: Red pargo
Order: Perciformes
Habitat: Marine
Scientific name: Pagrus pagrus
Name: Red parrotfish
Order: Perciformes
Habitat: Marine
Scientific name: Sparisoma aurofrenatum
Name: Red perch
Order: Perciformes
Habitat: Marine
Scientific name: Sebastes marinus
Name: Red pomfret
Order: Perciformes
Habitat: Marine
Scientific name: Brama brama
Name: Red porgy
Order: Perciformes
Habitat: Marine
Scientific name: Pagrus pagrus
Name: Red razorfish
Order: Perciformes
Habitat: Sandy bottoms
Scientific name: Xyrichtys novacula
Name: Red salmon
Order: Salmoniformes
Habitat: Freshwater/Marine
Scientific name: Oncorhynchus nerka
Name: Red scorpionfish
Order: Perciformes
Habitat: Marine
Scientific name: Scorpaena scrofa
Name: Red sea anemonefish
Order: Perciformes
Habitat: Marine
Scientific name: Amphiprion bicinctus
Name: Red sea bannerfish
Order: Perciformes
Habitat: Marine
Scientific name: Heniochus intermedius
Name: Red sea bream
Order: Perciformes
Habitat: Marine
Scientific name: Pagellus bogaraveo
Name: Red sea clownfish
Order: Perciformes
Habitat: Marine
Scientific name: Amphiprion bicinctus
Name: Red sea dab
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Solea aegyptiaca
Name: Red sea goatfish
Order: Perciformes
Habitat: Marine
Scientific name: Parupeneus forsskali
Name: Red sea gurnard
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Pterygotrigla robertsi
Name: Red sea hawkfish
Order: Perciformes
Habitat: Marine
Scientific name: Paracirrhites forsteri
Name: Red sea hogfish
Order: Perciformes
Habitat: Marine
Scientific name: Bodianus opercularis
Name: Red sea parrotfish
Order: Perciformes
Habitat: Marine
Scientific name: Scarus russelii
Name: Red sea snapper
Order: Perciformes
Habitat: Marine
Scientific name: Lutjanus ehrenbergii
Name: Red sea wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Symphodus cinereus
Name: Red seabream
Order: Perciformes
Habitat: Coastal marine
Scientific name: Pagrus major
Name: Red snapper
Order: Perciformes
Habitat: Reefs and rocky bottoms
Scientific name: Lutjanus campechanus
Name: Red spot emperors
Order: Perciformes
Habitat: Marine
Scientific name: Lethrinus erythracanthus
Name: Red spot goby
Order: Perciformes
Habitat: Marine
Scientific name: Amblygobius pholegandros
Name: Red spot grouper
Order: Perciformes
Habitat: Marine
Scientific name: Epinephelus chlorostigma
Name: Red spot hawkfish
Order: Perciformes
Habitat: Marine
Scientific name: Paracirrhites punctatus
Name: Red spot parrotfish
Order: Perciformes
Habitat: Marine
Scientific name: Sparisoma chrysopterum
Name: Red spot wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Halichoeres marginatus
Name: Red spotted hawkfish
Order: Perciformes
Habitat: Marine
Scientific name: Amblycirrhitus bimaculatus
Name: Red spotted jewelfish
Order: Cichliformes
Habitat: Freshwater rivers and lakes
Scientific name: Hemichromis guttatus
Name: Red squirrelfish
Order: Holocentriformes
Habitat: Marine
Scientific name: Sargocentron rubrum
Name: Red streak parrotfish
Order: Perciformes
Habitat: Marine
Scientific name: Sparisoma rubripinne
Name: Red swamp crayfish
Order: Decapoda
Habitat: Freshwater (often considered an ecological pest when invasive)
Scientific name: Procambarus clarkii
Name: Red swamp eel
Order: Synbranchiformes
Habitat: Freshwater
Scientific name: Monopterus albus
Name: Red tail barbel
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Barbus barbus
Name: Red tail catfish
Order: Siluriformes
Habitat: Freshwater
Scientific name: Phractocephalus hemioliopterus
Name: Red tail pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Dunckerocampus dactyliophorus
Name: Red tailed shark
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Epalzeorhynchos bicolor
Name: Red throat emperor
Order: Perciformes
Habitat: Coral reefs and rocky bottoms
Scientific name: Lethrinus miniatus
Name: Red tipped shark
Order: Carcharhiniformes
Habitat: Marine
Scientific name: Carcharhinus altimus
Name: Red tooth triggerfish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Odonus niger
Name: Red triggerfish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Balistes polylepis
Name: Red velvet wrasse
Order: Perciformes
Habitat: Coral reefs
Scientific name: Cirrhilabrus exquisitus
Name: Red velvetfish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Gnathanacanthus goetzeei
Name: Red whipray
Order: Myliobatiformes
Habitat: Marine
Scientific name: Himantura uarnak
Name: Red winged blenny
Order: Perciformes
Habitat: Marine
Scientific name: Cirripectes stigmapterus
Name: Red-banded Cardinalfish
Order: Kurtiformes
Habitat: Marine
Scientific name: Apogon doederleini
Name: Red-banded wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Halichoeres opercularis
Name: Red-bellied Piranha
Order: Characiformes
Habitat: Freshwater
Scientific name: Pygocentrus nattereri
Name: Red-bellied piranha
Order: Characiformes
Habitat: Freshwater
Scientific name: Pygocentrus nattereri
Name: Red-breasted wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Symphodus melops
Name: Red-cheeked Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Ecsenius pictus
Name: Red-edged Triplefin
Order: Blenniiformes
Habitat: Marine
Scientific name: Tripterygion delaisi
Name: Red-finned Kadavu Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Ecsenius kadovuensis
Name: Red-finned shark
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Epalzeorhynchos frenatum
Name: Red-handed Shrimp Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Ctenogobiops fernaldi
Name: Red-headed Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Elacatinus puncticulatus
Name: Red-lipped Batfish
Order: Lophiiformes
Habitat: Marine
Scientific name: Ogcocephalus darwini
Name: Red-lipped batfish
Order: Lophiiformes
Habitat: Marine
Scientific name: Ogcocephalus darwini
Name: Red-lipped blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Ophioblennius atlanticus
Name: Red-margined Triggerfish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Sufflamen chrysopterum
Name: Red-mouthed Triggerfish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Sufflamen fraenatum
Name: Red-mouthed rockfish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Sebastes miniatus
Name: Red-ridged Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Ecsenius gravieri
Name: Red-saddled Toby
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Canthigaster coronata
Name: Red-socket Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Cryptocentrus albidorsus
Name: Red-spot wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Coris aygula
Name: Red-spotted Hawkfish
Order: Perciformes
Habitat: Marine
Scientific name: Paracirrhites forsteri
Name: Red-spotted Shrimp Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Amblyeleotris guttata
Name: Red-spotted blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Aidablennius sphynx
Name: Red-striped Squirrelfish
Order: Holocentriformes
Habitat: Marine
Scientific name: Sargocentron rubrum
Name: Red-tail barracuda
Order: Perciformes
Habitat: Marine
Scientific name: Sphyraena barracuda
Name: Red-tentacled Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Ecsenius tentaculatus
Name: Red-tipped Coral Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobiodon rivulatus
Name: Red-tipped halfbeak
Order: Beloniformes
Habitat: Marine
Scientific name: Hemiramphus marginatus
Name: Red-tipped reef crab
Order: Decapoda
Habitat: Rocky intertidal zones
Scientific name: Percnon planissimum
Name: Redback wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Paracheilinus mccoskeri
Name: Redband parrotfish
Order: Perciformes
Habitat: Marine
Scientific name: Sparisoma aurofrenatum
Name: Redbanded parrotfish
Order: Perciformes
Habitat: Coral reefs
Scientific name: Sparisoma aurofrenatum
Name: Redbarred sandperch
Order: Perciformes
Habitat: Marine
Scientific name: Parapercis hexophtalma
Name: Redbellied piranha
Order: Characiformes
Habitat: Freshwater
Scientific name: Pygocentrus nattereri
Name: Redbelly blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Ecsenius axelrodi
Name: Redbelly tilapia
Order: Cichliformes
Habitat: Freshwater
Scientific name: Coptodon zillii
Name: Redbreast sunfish
Order: Perciformes
Habitat: Freshwater rivers and lakes
Scientific name: Lepomis auritus
Name: Redbreasted maomao
Order: Perciformes
Habitat: Marine
Scientific name: Caprodon longimanus
Name: Redcap goby
Order: Gobiiformes
Habitat: Coral reefs
Scientific name: Elacatinus puncticulatus
Name: Redcheek butterfish
Order: Perciformes
Habitat: Marine
Scientific name: Psenes arafurensis
Name: Redcheek parrotfish
Order: Perciformes
Habitat: Marine
Scientific name: Scarus forsteni
Name: Redcheek wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Halichoeres rubricephalus
Name: Redcoat
Order: Perciformes
Habitat: Marine
Scientific name: Sargocentron rubrum
Name: Reddish damselfish
Order: Perciformes
Habitat: Marine
Scientific name: Pomacentrus rubristigma
Name: Reddish scorpionfish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Scorpaena rubella
Name: Redear sunfish
Order: Perciformes
Habitat: Freshwater
Scientific name: Lepomis microlophus
Name: Redfield's pupfish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Empetrichthys latos
Name: Redfin
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rutilus rutilus
Name: Redfin Blue-eye
Order: Atheriniformes
Habitat: Freshwater (often introduced)
Scientific name: Poecilia reticulata
Name: Redfin Perch
Order: Perciformes
Habitat: Freshwater/Brackish
Scientific name: Perca fluviatilis
Name: Redfin Wrasse
Order: Labriformes
Habitat: Marine
Scientific name: Cirrhilabrus rubripinnis
Name: Redfin anthias
Order: Perciformes
Habitat: Marine
Scientific name: Pseudanthias dispar
Name: Redfin perch
Order: Perciformes
Habitat: Freshwater lakes and rivers
Scientific name: Perca fluviatilis
Name: Redfin pickerel
Order: Esociformes
Habitat: Freshwater
Scientific name: Esox americanus americanus
Name: Redfin planyfish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Phallichthys pittieri
Name: Redfin shovelnose ray
Order: Rajiformes
Habitat: Marine
Scientific name: Rhinobatos horkelii
Name: Redfinned shark
Order: Cypriniformes
Habitat: Freshwater (Often called Red-tailed shark too)
Scientific name: Epalzeorhynchos frenatum
Name: Redfinned whalefish
Order: Stephanoberyciiformes
Habitat: Marine
Scientific name: Cetomimidae
Name: Redfish
Order: Perciformes
Habitat: Marine
Scientific name: Sebastes viviparus
Name: Redhand goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Stonogobiops nematodes
Name: Redhead goby
Order: Gobiiformes
Habitat: Coral reefs
Scientific name: Elacatinus macrodon
Name: Redheaded goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Elacatinus puncticulatus
Name: Redheaded parrotfish
Order: Perciformes
Habitat: Marine
Scientific name: Chlorurus strongylocephalus
Name: Redhorse sucker
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Moxostoma
Name: Redline grouper
Order: Perciformes
Habitat: Marine
Scientific name: Epinephelus reticulatus
Name: Redlined anthias
Order: Perciformes
Habitat: Marine
Scientific name: Pseudanthias rubrizonatus
Name: Redlipped blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Ophioblennius atlanticus
Name: Redlipped goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius rubropunctatus
Name: Redlipped moray
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax chilensis
Name: Redlipped pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Hippichthys heptagonus
Name: Redmouth grouper
Order: Perciformes
Habitat: Marine
Scientific name: Epinephelus mystacinus
Name: Redmouth scorpionfish
Order: Scorpaeniformes
Habitat: Rocky reefs
Scientific name: Scorpaena maderensis
Name: Redmouthed grouper
Order: Perciformes
Habitat: Marine
Scientific name: Cephalopholis sonnerati
Name: Rednaped wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Halichoeres prosopeion
Name: Redneck damselfish
Order: Perciformes
Habitat: Marine
Scientific name: Pomacentrus roosevelti
Name: Redpatch anthias
Order: Perciformes
Habitat: Marine
Scientific name: Pseudanthias rubrilaevis
Name: Redpatch hawkfish
Order: Perciformes
Habitat: Marine
Scientific name: Cirrhitichthys oxycephalus
Name: Redside dace
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Clinostomus elongatus
Name: Redspot blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Ecsenius stigmatura
Name: Redspot fairy wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Cirrhilabrus punctata
Name: Redspot goatfish
Order: Mulliformes
Habitat: Marine
Scientific name: Parupeneus chrysopleuron
Name: Redspot grouper
Order: Perciformes
Habitat: Marine
Scientific name: Epinephelus magniscuttis
Name: Redspot hawkfish
Order: Perciformes
Habitat: Marine
Scientific name: Cirrhitichthys oxycephalus
Name: Redspot wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Halichoeres stigmaturus
Name: Redstripe pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Dunckerocampus dactyliophorus
Name: Redstripe snapper
Order: Perciformes
Habitat: Marine
Scientific name: Lutjanus synagris
Name: Redtail catfish
Order: Siluriformes
Habitat: Freshwater rivers
Scientific name: Phractocephalus hemioliopterus
Name: Redtail coral trout
Order: Perciformes
Habitat: Coral reefs
Scientific name: Plectropomus oligacanthus
Name: Redtailed fusilier
Order: Perciformes
Habitat: Marine
Scientific name: Caesio cuning
Name: Redtailed triggerfish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Sufflamen chrysopterum
Name: Redtooth triggerfish
Order: Tetraodontiformes
Habitat: Coral reefs
Scientific name: Odonus niger
Name: Redvelvet shrimpfish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Aeoliscus strigatus
Name: Reedfish
Order: Polypteriformes
Habitat: Freshwater
Scientific name: Erpetoichthys calabaricus
Name: Reef anglerfish
Order: Lophiiformes
Habitat: Marine
Scientific name: Antennarius striatus
Name: Reef batfish
Order: Ephippiformes
Habitat: Marine
Scientific name: Platax pinnatus
Name: Reef blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Parablennius pilicornis
Name: Reef butterflyfish
Order: Perciformes
Habitat: Marine
Scientific name: Chaetodon sedentarius
Name: Reef cod
Order: Perciformes
Habitat: Marine
Scientific name: Epinephelus corallicola
Name: Reef croaker
Order: Perciformes
Habitat: Marine
Scientific name: Micropogonias undulatus
Name: Reef flat angelfish
Order: Perciformes
Habitat: Marine
Scientific name: Pomacanthus annularis
Name: Reef stonefish
Order: Scorpaeniformes
Habitat: Coral reefs and rocky bottoms
Scientific name: Synanceia verrucosa
Name: Reef triggerfish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Rhinecanthus aculeatus
Name: Reef whitetip shark
Order: Carcharhiniformes
Habitat: Marine
Scientific name: Triaenodon obesus
Name: Regal Angelfish
Order: Perciformes
Habitat: Marine
Scientific name: Pygoplites diacanthus
Name: Regal Damselfish
Order: Perciformes
Habitat: Marine
Scientific name: Neoglyphidodon thoracotaeniatus
Name: Regal Dottyback
Order: Perciformes
Habitat: Marine
Scientific name: Pseudochromis aldabraensis
Name: Regal Jumper Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Omobranchus ferox
Name: Regal angelfish
Order: Perciformes
Habitat: Coral reefs
Scientific name: Pygoplites diacanthus
Name: Regal damselfish
Order: Perciformes
Habitat: Coral reefs
Scientific name: Neoglyphidodon thoracotaeniatus
Name: Regal demoiselle
Order: Perciformes
Habitat: Marine
Scientific name: Neopomacentrus nemurus
Name: Regal dotsnapper
Order: Perciformes
Habitat: Marine
Scientific name: Lutjanus madras
Name: Regal parrotfish
Order: Perciformes
Habitat: Marine
Scientific name: Scaridae chrysopterus
Name: Regal sea snake
Order: Elapidae
Habitat: Marine
Scientific name: Hydrophis stokesii
Name: Regal tang
Order: Perciformes
Habitat: Coral reefs
Scientific name: Paracanthurus hepatus
Name: Regal tilefish
Order: Perciformes
Habitat: Marine
Scientific name: Hoplolatilus starcki
Name: Regan's parrotfish
Order: Perciformes
Habitat: Marine
Scientific name: Scarus regani
Name: Regan's seahorse
Order: Syngnathiformes
Habitat: Marine
Scientific name: Hippocampus reidi
Name: Reggie's damselfish
Order: Perciformes
Habitat: Marine
Scientific name: Pomacentrus reedi
Name: Regulus fish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys regulus
Name: Reid's Sea Dragon
Order: Syngnathiformes
Habitat: Marine
Scientific name: Phyllopteryx reidi
Name: Reid's pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys reidi
Name: Reinbolt's damselfish
Order: Perciformes
Habitat: Marine
Scientific name: Pomacentrus reini
Name: Reinhard's flounder
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Reinhardtius hippoglossoides
Name: Reinhardt's flatfish
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Pleuronectes quadrituberculatus
Name: Reinhardtius halibut
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Reinhardtius hippoglossoides
Name: Rembrandt Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Amblygobius bynoensis
Name: Remora
Order: Perciformes
Habitat: Marine
Scientific name: Echeneis naucrates
Name: Remora remora
Order: Perciformes
Habitat: Marine
Scientific name: Remora remora
Name: Rendahl's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Sueviotrilus rendalli
Name: Requiem shark
Order: Carcharhiniformes
Habitat: Marine
Scientific name: Carcharhinus longimanus
Name: Retaliator blenny
Order: Perciformes
Habitat: Marine
Scientific name: Aspidontus taeniatus
Name: Retaliator goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Discordipinna griessingeri
Name: Reticulated Dragonet
Order: Syngnathiformes
Habitat: Marine
Scientific name: Synchiropus reticulatus
Name: Reticulated dragonet
Order: Perciformes
Habitat: Sandy and muddy bottoms
Scientific name: Symphypleura reticulata
Name: Reticulated hillstream loach
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Sewellia lineolata
Name: Reticulated moray
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax reticularis
Name: Reticulated puffer
Order: Tetraodontiformes
Habitat: Coral reefs
Scientific name: Arothron reticularis
Name: Reticulated pufferfish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Arothron reticularis
Name: Reticulated stargazer
Order: Uranoscopiformes
Habitat: Marine
Scientific name: Uranoscopus reticulatus
Name: Reticulated surgeonfish
Order: Acanthuriformes
Habitat: Marine
Scientific name: Acanthurus reticulatus
Name: Reticulated swellshark
Order: Carcharhiniformes
Habitat: Marine
Scientific name: Cephaloscyllium retifer
Name: Reticulated tilefish
Order: Perciformes
Habitat: Marine
Scientific name: Hoplolatilus reticulatus
Name: Reticulated whipray
Order: Myliobatiformes
Habitat: Marine and estuarine
Scientific name: Himantura uarnak
Name: Reuleaux's blenny
Order: Perciformes
Habitat: Marine
Scientific name: Ecsenius reitmeri
Name: Reunion seahorse
Order: Syngnathiformes
Habitat: Marine
Scientific name: Hippocampus borboniensis
Name: Reversed blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Aidablennius scabra
Name: Rex sole
Order: Pleuronectiformes
Habitat: Deep sandy and muddy bottoms
Scientific name: Glyptocephalus zachirus
Name: Rhadinesthes decimus
Order: Stomiiformes
Habitat: Marine
Scientific name: Rhadinesthes decimus
Name: Rhamphochromis
Order: Cichliformes
Habitat: Freshwater lakes
Scientific name: Rhamphochromis
Name: Rhamphorhynchus Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Rhamphocottus richardsonii
Name: Rhinecanthus rectangulus
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Rhinecanthus rectangulus
Name: Rhino Razorfish
Order: Perciformes
Habitat: Marine
Scientific name: Iniistius novacula
Name: Rhino blenny
Order: Blenniiformes
Habitat: Coral reefs
Scientific name: Cirripectes albolimus
Name: Rhino pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys ocellatus
Name: Rhino ray
Order: Rhinopristiformes
Habitat: Marine
Scientific name: Rhina ancylostomus
Name: Rhino sculpin
Order: Scorpaeniformes
Habitat: Freshwater
Scientific name: Cottus asperrima
Name: Rhinobatos rhinobatos
Order: Rhinopristiformes
Habitat: Marine
Scientific name: Rhinobatos rhinobatos
Name: Rhinoceros Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Meiacanthus rhinoceratus
Name: Rhinoceros fish
Order: Clupeiformes
Habitat: Marine
Scientific name: Chirocentrus dorab
Name: Rhinoceros leatherjacket
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Pseudalutarius nasicornis
Name: Rhinochimaera
Order: Chimaeriformes
Habitat: Marine
Scientific name: Rhinochimaera atlantica
Name: Rhinochimaera atlantica
Order: Chimaeriformes
Habitat: Marine
Scientific name: Harriotta raleighana
Name: Rhinosinus pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Halicampus macrorhynchus
Name: Rhizoprionodon lalandei
Order: Carcharhiniformes
Habitat: Marine
Scientific name: Rhizoprionodon lalandei
Name: Rhodeus
Order: Cypriniformes
Habitat: Freshwater streams and ponds
Scientific name: Rhodeus amarus
Name: Rhodeus amarus
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rhodeus amarus
Name: Rhomboid mojarra
Order: Perciformes
Habitat: Estuarine and coastal marine
Scientific name: Diapterus rhombeus
Name: Rhomboid wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Cirrhilabrus rhomboidalis
Name: Rhomboidal triplefin
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Tripodichthys oxycephalus
Name: Rhoplichthys scabra
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Rhoplichthys scabra
Name: Rhyacichthys aspro
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Rhyacichthys aspro
Name: Ribbed blenny
Order: Perciformes
Habitat: Marine
Scientific name: Parablennius gattorugine
Name: Ribbed moray
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax richelieu
Name: Ribbed pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Trachyrhamphus longirostris
Name: Ribbon eel
Order: Anguilliformes
Habitat: Coral reefs
Scientific name: Rhinomuraena quaesita
Name: Ribbon fish
Order: Ophidiiformes
Habitat: Deep marine
Scientific name: Trachipterus arcticus
Name: Ribbon sawtail
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Plewronectes modestus
Name: Ribbon sawtail fish
Order: Anguilliformes
Habitat: Deep marine
Scientific name: Serrivomer beanii
Name: Ribbon sweetlips
Order: Perciformes
Habitat: Marine
Scientific name: Plectorhinchus polytaenia
Name: Ribbon-finned manefish
Order: Stephanoberyciiformes
Habitat: Marine
Scientific name: Caristius macropterus
Name: Ribbon-finned wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Xyrichtys novacula
Name: Ribbon-tailed stingray
Order: Myliobatiformes
Habitat: Marine
Scientific name: Taeniura lymma
Name: Ribboned pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Haliichthys taeniophorus
Name: Ribboned sweetlips
Order: Perciformes
Habitat: Marine
Scientific name: Plectorhinchus chaetodonoides
Name: Ribbonfish
Order: Lampriformes
Habitat: Deep marine
Scientific name: Trachipteridae
Name: Ribbontail stingray
Order: Myliobatiformes
Habitat: Marine
Scientific name: Taeniura lymma
Name: Rice eel
Order: Synbranchiformes
Habitat: Freshwater
Scientific name: Monopterus albus
Name: Richards' Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Cryptocentrus singapurensis
Name: Richardson's Dragonet
Order: Syngnathiformes
Habitat: Marine
Scientific name: Synchiropus richardsonii
Name: Richardson's Sculpin
Order: Scorpaeniformes
Habitat: Freshwater
Scientific name: Cottus richardsonii
Name: Richardson's dragonet
Order: Perciformes
Habitat: Marine
Scientific name: Synchiropus richardsi
Name: Richardson's leatherjacket
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Eubalichthys quadrispinus
Name: Richardson's rockfish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Sebastes reedi
Name: Richter's pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Solegnathus hardwickii
Name: Ricord's goby
Order: Gobiiformes
Habitat: Marine (Often refers to Sharknose Goby)
Scientific name: Elacatinus oceanops
Name: Ridge-snout mullet
Order: Mugiliformes
Habitat: Marine
Scientific name: Oedalechilus labiosus
Name: Ridgeback pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys intestinalis
Name: Ridgeback rockfish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Sebastes melanostomus
Name: Ridgehead
Order: Ateleopodiformes
Habitat: Marine
Scientific name: Ateleopus japonicus
Name: Riffle sculpin
Order: Scorpaeniformes
Habitat: Freshwater streams
Scientific name: Cottus gulosus
Name: Riflefish
Order: Perciformes
Habitat: Freshwater/Brackish
Scientific name: Toxotes jaculatrix
Name: Righteye flounder
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Pleuronectes platessa
Name: Rigid Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Coryphopterus glaucofraenum
Name: Rigid pipefish
Order: Syngnathiformes
Habitat: Seagrass beds
Scientific name: Syngnathus rigidus
Name: Rigid seahorse
Order: Syngnathiformes
Habitat: Marine
Scientific name: Hippocampus erectus
Name: Rimscale lanternfish
Order: Myctophiformes
Habitat: Marine
Scientific name: Lampanyctus rimosus
Name: Rindani Cardinalfish
Order: Kurtiformes
Habitat: Marine
Scientific name: Apogon isus
Name: Ring blenny
Order: Blenniiformes
Habitat: Rocky shores
Scientific name: Parablennius tentacularis
Name: Ringed Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Doryrhamphus dactyliophorus
Name: Ringed Wrasse
Order: Labriformes
Habitat: Marine
Scientific name: Bodianus axillaris
Name: Ringed blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Salarias ramosus
Name: Ringed butterflyfish
Order: Perciformes
Habitat: Marine
Scientific name: Chaetodon auriga
Name: Ringed filefish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Aluterus scriptus
Name: Ringed goatfish
Order: Mulliformes
Habitat: Marine
Scientific name: Upeneus cirrinarius
Name: Ringed hawkfish
Order: Perciformes
Habitat: Marine
Scientific name: Cirrhitichthys ringens
Name: Ringed perch
Order: Perciformes
Habitat: Freshwater rivers
Scientific name: Datnioides undecimradiatus
Name: Ringed pipefish
Order: Syngnathiformes
Habitat: Coral reefs
Scientific name: Dunckerocampus dactyliophorus
Name: Ringed puffer
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Arothron manilensis
Name: Ringed wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Halichoeres annulatus
Name: Ringeye goby
Order: Gobiiformes
Habitat: Coral reefs
Scientific name: Trimmatom nanus
Name: Rio Fuerte cichlid
Order: Cichliformes
Habitat: Freshwater rivers
Scientific name: Herichthys steindachneri
Name: Rio Grande cichlid
Order: Cichliformes
Habitat: Freshwater
Scientific name: Herichthys cyanoguttatus
Name: Rio Grande killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Fundulus zebrinus
Name: Rio Grande perch
Order: Perciformes
Habitat: Freshwater
Scientific name: Herichthys cyanoguttatus
Name: Rio de Janeiro killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Nothobranchius guentheri
Name: Riparian Killifish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Rivulus hartii
Name: Riparian brook lamprey
Order: Petromyzontiformes
Habitat: Freshwater
Scientific name: Lampetra richardsoni
Name: Ripley's cardinalfish
Order: Perciformes
Habitat: Marine
Scientific name: Apogonichthyoides leptacanthus
Name: Ripley's wrasse
Order: Perciformes
Habitat: Coral reefs
Scientific name: Thalassoma hardwicke
Name: Ripple rockfish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Sebastes rastrelliger
Name: Rippy's cusk-eel
Order: Ophidiiformes
Habitat: Marine
Scientific name: Ophidion ripi
Name: River Blackfish
Order: Perciformes
Habitat: Freshwater
Scientific name: Gadopsis marmoratus
Name: River Moray
Order: Anguilliformes
Habitat: Freshwater/Brackish
Scientific name: Gymnothorax tile
Name: River Perch
Order: Perciformes
Habitat: Freshwater/Brackish
Scientific name: Perca fluviatilis
Name: River Pipefish
Order: Syngnathiformes
Habitat: Freshwater/Brackish
Scientific name: Syngnathoides biaculeatus
Name: River Shark
Order: Carcharhiniformes
Habitat: Freshwater/Brackish
Scientific name: Glyphis gangeticus
Name: River Sturgeon
Order: Acipenseriformes
Habitat: Freshwater/Brackish
Scientific name: Acipenser medirostris
Name: River Tonguefish
Order: Pleuronectiformes
Habitat: Freshwater/Brackish
Scientific name: Cynoglossus trigrammus
Name: River angel
Order: Rajiformes
Habitat: Marine
Scientific name: Rhinobatos cemiculus
Name: River bass
Order: Perciformes
Habitat: Freshwater
Scientific name: Paradicichthys venenatus
Name: River blackfish
Order: Perciformes
Habitat: Freshwater rivers
Scientific name: Gadopsis marmoratus
Name: River bream
Order: Perciformes
Habitat: Freshwater/Brackish
Scientific name: Acanthopagrus butcheri
Name: River carp
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Labeo pangasia
Name: River carpsucker
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Carpiodes carpio
Name: River char
Order: Salmoniformes
Habitat: Freshwater
Scientific name: Salvelinus alpinus
Name: River crab-eater
Order: Perciformes
Habitat: Marine
Scientific name: Symphurus diomedeanus
Name: River croaker
Order: Perciformes
Habitat: Freshwater
Scientific name: Plagioscion squamosissimus
Name: River darter
Order: Perciformes
Habitat: Freshwater
Scientific name: Percina shumardi
Name: River dogfish
Order: Squaliformes
Habitat: Marine
Scientific name: Scyliorhinus retifer
Name: River eel
Order: Anguilliformes
Habitat: Freshwater/Marine
Scientific name: Anguilla anguilla
Name: River gar
Order: Lepisosteiformes
Habitat: Freshwater
Scientific name: Lepisosteus osseus
Name: River garfish
Order: Beloniformes
Habitat: Estuarine and coastal marine
Scientific name: Belone belone
Name: River goby
Order: Gobiiformes
Habitat: Freshwater/Brackish
Scientific name: Gobius fluviatilis
Name: River halfbeak
Order: Beloniformes
Habitat: Freshwater/Brackish
Scientific name: Zenarchopterus dispar
Name: River hatchetfish
Order: Characiformes
Habitat: Freshwater
Scientific name: Gasteropelecus sternicla
Name: River lamprey
Order: Petromyzontiformes
Habitat: Freshwater rivers and coastal marine
Scientific name: Lampetra fluviatilis
Name: River limia
Order: Cyprinodontiformes
Habitat: Freshwater rivers and springs
Scientific name: Poecilia nicholsi
Name: River perch
Order: Perciformes
Habitat: Freshwater lakes and rivers
Scientific name: Perca fluviatilis
Name: River pilchard
Order: Clupeiformes
Habitat: Freshwater/Brackish
Scientific name: Hypoatherina valenciennei
Name: River pipefish
Order: Syngnathiformes
Habitat: Freshwater
Scientific name: Doryichthys deokhatoides
Name: River puffer
Order: Tetraodontiformes
Habitat: Freshwater
Scientific name: Tetraodon fluviatilis
Name: River pupfish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Cyprinodon variegatus
Name: River ray
Order: Myliobatiformes
Habitat: Freshwater
Scientific name: Potamotrygon motoro
Name: River redhorse
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Moxostoma carinatum
Name: River seahorse
Order: Syngnathiformes
Habitat: Marine
Scientific name: Hippocampus kuda
Name: River shark
Order: Carcharhiniformes
Habitat: Freshwater rivers and estuaries
Scientific name: Glyphis gangeticus
Name: River snapper
Order: Perciformes
Habitat: Freshwater/Brackish
Scientific name: Lutjanus fuscescens
Name: River stickleback
Order: Gasterosteiformes
Habitat: Freshwater/Brackish
Scientific name: Gasterosteus aculeatus
Name: River stingray
Order: Myliobatiformes
Habitat: Freshwater rivers
Scientific name: Potamotrygon
Name: River sturgeon
Order: Acipenseriformes
Habitat: Freshwater/Brackish
Scientific name: Acipenser fulvescens
Name: River tarpon
Order: Elopiformes
Habitat: Freshwater/Brackish
Scientific name: Megalops cyprinoides
Name: River tilefish
Order: Perciformes
Habitat: Marine
Scientific name: Malacanthus burracanthus
Name: River torpedo
Order: Torpediniformes
Habitat: Marine
Scientific name: Torpedo torpedo
Name: River trout
Order: Salmoniformes
Habitat: Freshwater/Marine
Scientific name: Salmo trutta
Name: River whiting
Order: Gadiformes
Habitat: Marine
Scientific name: Macruronus novaezelandiae
Name: Rivetfish
Order: Perciformes
Habitat: Marine (likely refers to Rivulus or Rivet gobies)
Scientific name: Rivettia
Name: Roach
Order: Cypriniformes
Habitat: Freshwater rivers and lakes
Scientific name: Rutilus rutilus
Name: Roanoke bass
Order: Perciformes
Habitat: Freshwater
Scientific name: Ambloplites cavifrons
Name: Roanoke darter
Order: Perciformes
Habitat: Freshwater
Scientific name: Percina roanoka
Name: Roatan Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Elacatinus atronasus
Name: Robalo
Order: Perciformes
Habitat: Marine (Common Snook)
Scientific name: Centropomus undecimalis
Name: Robber croaker
Order: Perciformes
Habitat: Marine
Scientific name: Paranibea semiluctuosa
Name: Robert's corydoras
Order: Siluriformes
Habitat: Freshwater
Scientific name: Corydoras robri
Name: Roberts' perch
Order: Perciformes
Habitat: Freshwater
Scientific name: Ambassis robertsi
Name: Robin redbreast
Order: Perciformes
Habitat: Freshwater
Scientific name: Centrarchus macropterus
Name: Robins' Cardinalfish
Order: Kurtiformes
Habitat: Marine
Scientific name: Apogon robinsi
Name: Robinson's Anemonefish
Order: Perciformes
Habitat: Marine
Scientific name: Amphiprion robinsoni
Name: Robinson's parrotfish
Order: Perciformes
Habitat: Marine
Scientific name: Scarus dubius
Name: Robust Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Ecsenius bicolor
Name: Robust Lizardfish
Order: Aulopiformes
Habitat: Marine
Scientific name: Synodus robustus
Name: Robust Perch
Order: Perciformes
Habitat: Freshwater
Scientific name: Perca robusta
Name: Robust basslet
Order: Perciformes
Habitat: Marine
Scientific name: Liopropoma aberrans
Name: Robust ghost pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Solenostomus cyanopterus
Name: Robust ghostpipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Solenostomus cyanopterus
Name: Robust ghostshark
Order: Chimaeriformes
Habitat: Marine
Scientific name: Hydrolagus pallidus
Name: Robust grunt
Order: Perciformes
Habitat: Marine
Scientific name: Pomadasys punctulatus
Name: Robust moray
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax robustus
Name: Robust pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Syngnathus robustus
Name: Robust sleeper
Order: Gobiiformes
Habitat: Freshwater/Brackish
Scientific name: Eleotris fusca
Name: Robust wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Halichoeres robustus
Name: Rock bass
Order: Perciformes
Habitat: Freshwater lakes and rivers
Scientific name: Ambloplites rupestris
Name: Rock beauty
Order: Perciformes
Habitat: Coral reefs
Scientific name: Holacanthus tricolor
Name: Rock blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Ophioblennius macclurei
Name: Rock clingfish
Order: Gobiesociformes
Habitat: Rocky shores
Scientific name: Lepadogaster lepadogaster
Name: Rock cod
Order: Gadiformes
Habitat: Marine
Scientific name: Gadus morhua
Name: Rock cook
Order: Perciformes
Habitat: Rocky reefs
Scientific name: Centrolabrus exoletus
Name: Rock crab-eater
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Sebastolobus alascanus
Name: Rock croaker
Order: Perciformes
Habitat: Coastal marine
Scientific name: Umbrina aurata
Name: Rock cusk-eel
Order: Ophidiiformes
Habitat: Marine
Scientific name: Ophidion rockfish
Name: Rock eel
Order: Perciformes
Habitat: Marine
Scientific name: Pholis gunnellus
Name: Rock goby
Order: Gobiiformes
Habitat: Rocky shores
Scientific name: Gobius paganellus
Name: Rock gunnel
Order: Perciformes
Habitat: Coastal marine
Scientific name: Pholis gunnellus
Name: Rock hawkfish
Order: Perciformes
Habitat: Marine
Scientific name: Cirrhitus rivulatus
Name: Rock hind
Order: Perciformes
Habitat: Rocky reefs
Scientific name: Epinephelus adscensionis
Name: Rock hopper blenny
Order: Perciformes
Habitat: Marine
Scientific name: Istiblennius periophthalmus
Name: Rock kabilya
Order: Scorpaeniformes
Habitat: Rocky reefs
Scientific name: Scorpaenopsis venosa
Name: Rock kelpfish
Order: Perciformes
Habitat: Marine
Scientific name: Chironemus marmoratus
Name: Rock knifefish
Order: Gymnotiformes
Habitat: Freshwater
Scientific name: Eigenmannia virescens
Name: Rock kurper
Order: Cichliformes
Habitat: Freshwater lakes and rivers
Scientific name: Tilapia ruweti
Name: Rock lumpsucker
Order: Scorpaeniformes
Habitat: Coastal marine
Scientific name: Cyclopterus lumpus
Name: Rock parrotfish
Order: Perciformes
Habitat: Marine
Scientific name: Sparisoma rubripinne
Name: Rock pipefish
Order: Syngnathiformes
Habitat: Seagrass beds and rocky reefs
Scientific name: Syngnathus acus
Name: Rock prickleback
Order: Perciformes
Habitat: Marine
Scientific name: Xiphister mucosus
Name: Rock sandperch
Order: Perciformes
Habitat: Sandy and rocky bottoms
Scientific name: Parapercis rockallensis
Name: Rock sea bass
Order: Perciformes
Habitat: Marine
Scientific name: Centropristis philadelphica
Name: Rock snapper
Order: Perciformes
Habitat: Rocky reefs
Scientific name: Lutjanus mahogoni
Name: Rock sole
Order: Pleuronectiformes
Habitat: Sandy and rocky bottoms
Scientific name: Lepidopsetta bilineata
Name: Rock spotted blenny
Order: Perciformes
Habitat: Marine
Scientific name: Parablennius sanguinolentus
Name: Rock wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Halichoeres semicinctus
Name: Rocket Frogfish
Order: Lophiiformes
Habitat: Marine
Scientific name: Antennarius multicellulatus
Name: Rocket Garfish
Order: Beloniformes
Habitat: Marine
Scientific name: Tropidostethus rhothophilus
Name: Rocket blenny
Order: Perciformes
Habitat: Marine
Scientific name: Aspidontus dussumieri
Name: Rocket goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Stonogobiops nematodes
Name: Rockfish
Order: Scorpaeniformes
Habitat: Rocky reefs
Scientific name: Sebastes
Name: Rockling
Order: Gadiformes
Habitat: Marine
Scientific name: Ciliata mustela
Name: Rockmover wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Novaculichthys taeniourus
Name: Rockpool Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Parablennius parvicornis
Name: Rockpool Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius paganellus
Name: Rockskipper Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Istiblennius zebra
Name: Rocky Mountain whitefish
Order: Salmoniformes
Habitat: Freshwater
Scientific name: Prosopium williamsoni
Name: Rocky shore Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Salarias ramosus
Name: Rocky shore clingfish
Order: Gobiesociformes
Habitat: Marine
Scientific name: Lepadogaster candollii
Name: Rodney's tang
Order: Perciformes
Habitat: Marine
Scientific name: Acanthurus triostegus
Name: Roe's parrotfish
Order: Perciformes
Habitat: Marine
Scientific name: Sparisoma roe
Name: Rofus emperor
Order: Perciformes
Habitat: Marine
Scientific name: Lethrinus rofu
Name: Rohu
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Labeo rohita
Name: Rolland's Damselfish
Order: Perciformes
Habitat: Marine
Scientific name: Plectroglyphidodon rollandi
Name: Rollerskates
Order: Rajiformes
Habitat: Marine
Scientific name: Notoraja tobitukai
Name: Rollestoni's stargazer
Order: Trachiniformes
Habitat: Marine
Scientific name: Gnathagnus rostellatus
Name: Romaine's Pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys rompu
Name: Roman snook
Order: Perciformes
Habitat: Marine
Scientific name: Centropomus undecimalis
Name: Roman-nosed snook
Order: Perciformes
Habitat: Marine
Scientific name: Centropomus pectinatus
Name: Roncador
Order: Perciformes
Habitat: Marine
Scientific name: Umbrina roncador
Name: Rondelet's Flyingfish
Order: Beloniformes
Habitat: Marine
Scientific name: Cheilopogon rondeletii
Name: Rondelet's deepwater stargazer
Order: Perciformes
Habitat: Marine
Scientific name: Kathetostoma canina
Name: Rondelet's flyingfish
Order: Beloniformes
Habitat: Marine
Scientific name: Cheilopogon rondeletii
Name: Rondella
Order: Perciformes
Habitat: Marine
Scientific name: Caranx hippos
Name: Roodlefish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Lagocephalus sceleratus
Name: Rookery fish
Order: Perciformes
Habitat: Marine (likely refers to Chromis species in rookeries)
Scientific name: Chromis
Name: Rooster Flounder
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Bothus mancus
Name: Rooster Wrasse
Order: Labriformes
Habitat: Marine
Scientific name: Oxycheilinus unifasciatus
Name: Rooster hind
Order: Perciformes
Habitat: Marine
Scientific name: Epinephelus fasciatus
Name: Rooster hogfish
Order: Perciformes
Habitat: Marine
Scientific name: Bodianus eclancheri
Name: Roosterfish
Order: Perciformes
Habitat: Coastal marine
Scientific name: Nematistius pectoralis
Name: Ropefish
Order: Polypteriformes
Habitat: Freshwater swamps and rivers
Scientific name: Erpetoichthys calabaricus
Name: Roper's seahorse
Order: Syngnathiformes
Habitat: Tropical marine waters
Scientific name: Hippocampus ropery
Name: Roper's wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Cheilinus roresii
Name: Rosa blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Ecsenius rosae
Name: Rosacea
Order: Squaliformes
Habitat: Marine (likely refers to a dogfish shark)
Scientific name: Centroscyllium ritteri
Name: Rosada
Order: Ophidiiformes
Habitat: Marine
Scientific name: Genypterus blacodes
Name: Rose Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Meiacanthus mossambicus
Name: Rose Cichlid
Order: Cichliformes
Habitat: Freshwater
Scientific name: Thorichthys meeki
Name: Rose Eel
Order: Anguilliformes
Habitat: Freshwater
Scientific name: Moringua raitaborua
Name: Rose Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobiodon spilophthalmus
Name: Rose Skulpin
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Scorpaena rosacea
Name: Rose Spotted Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Omobranchus roseus
Name: Rose Velvetfish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Parascorpaena mcadami
Name: Rose bass
Order: Lophiiformes
Habitat: Marine
Scientific name: Lophius americanus
Name: Rose bitterling
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Rhodeus ocellatus
Name: Rose blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Parablennius gattorugin
Name: Rose bream
Order: Spariformes
Habitat: Marine
Scientific name: Pagrus auratus
Name: Rose perch
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Helicolenus dactylopterus
Name: Rose wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Halichoeres marginatus
Name: Rose-banded blenny
Order: Perciformes
Habitat: Marine
Scientific name: Parablennius incognitus
Name: Rose-breasted wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Thalassoma hardwicke
Name: Rose-colored wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Thalassoma bifasciatum
Name: Rose-margined wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Cirrhilabrus exquisitus
Name: Rose-red Bass
Order: Perciformes
Habitat: Marine
Scientific name: Cephalopholis sonnerati
Name: Rose-striped Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Meiacanthus kamoharai
Name: Roseate fish
Order: Lophiiformes
Habitat: Marine
Scientific name: Lophius budegassa
Name: Roseate tern
Order: Charadriiformes
Habitat: Coastal and marine
Scientific name: Sterna dougallii
Name: Rosefin blenny
Order: Perciformes
Habitat: Marine
Scientific name: Entomacrodus roseoflabrum
Name: Roseland Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Cryptocentrus roseus
Name: Roseleaf scorpionfish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Rhinopias aphanes
Name: Roseless goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobiodon rosaceus
Name: Roselight fish
Order: Stomiiformes
Habitat: Marine
Scientific name: Maurolicus muelleri
Name: Roselius' dartfish
Order: Perciformes
Habitat: Marine
Scientific name: Nemateleotris roseliusi
Name: Rosen's pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Corythoichthys roseni
Name: Rosen's tetra
Order: Characiformes
Habitat: Freshwater
Scientific name: Hyphessobrycon rosaceus
Name: Rosenberg's Cardinalfish
Order: Kurtiformes
Habitat: Marine
Scientific name: Apogon margaritophorus
Name: Rosenberg's Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Amblyeleotris steinitzi
Name: Rosenblatt's Tilefish
Order: Perciformes
Habitat: Marine
Scientific name: Malacanthus rosenbergii
Name: Rosetail pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Dunckerocampus chapmani
Name: Rosette skate
Order: Rajiformes
Habitat: Marine
Scientific name: Leucoraja garmani
Name: Rosetted moray
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax mucifer
Name: Rosomak
Order: Salmo trutta
Habitat: Scandinavia
Scientific name: Freshwater
Name: Rosulate Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobiodon spilophthalmus
Name: Rosy Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Ecsenius oculus
Name: Rosy Cardinalfish
Order: Kurtiformes
Habitat: Marine
Scientific name: Apogon dewa
Name: Rosy barb
Order: Cypriniformes
Habitat: Freshwater streams
Scientific name: Pethia conchonius
Name: Rosy bass
Order: Perciformes
Habitat: Marine
Scientific name: Acanthistius cinctus
Name: Rosy basslet
Order: Perciformes
Habitat: Marine
Scientific name: Liopropoma rubre
Name: Rosy bitterling
Order: Cypriniformes
Habitat: Freshwater streams
Scientific name: Rhodeus ocellatus
Name: Rosy blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Ecsenius rubripinnis
Name: Rosy cardinalfish
Order: Kurtiformes
Habitat: Marine
Scientific name: Apogonichthys rubrananus
Name: Rosy darter
Order: Perciformes
Habitat: Freshwater
Scientific name: Etheostoma rubrum
Name: Rosy dartfish
Order: Perciformes
Habitat: Marine
Scientific name: Ptereleotris rubristigma
Name: Rosy doris
Order: Perciformes
Habitat: Marine
Scientific name: Anthias squamipinnis
Name: Rosy dory
Order: Zeiformes
Habitat: Marine
Scientific name: Zenopsis conchifer
Name: Rosy dottyback
Order: Perciformes
Habitat: Marine
Scientific name: Pseudochromis fuscus
Name: Rosy drum
Order: Perciformes
Habitat: Marine
Scientific name: Umbrina ronchus
Name: Rosy filefish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Cantherhines fronticinctus
Name: Rosy flagtail
Order: Perciformes
Habitat: Marine
Scientific name: Kuhlia rubra
Name: Rosy flathead
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Rogadius pristiger
Name: Rosy grouper
Order: Perciformes
Habitat: Marine
Scientific name: Epinephelus rosaceus
Name: Rosy hawkfish
Order: Perciformes
Habitat: Marine
Scientific name: Cirrhitichthys rubripinnis
Name: Rosy jack
Order: Perciformes
Habitat: Marine
Scientific name: Caranx ruber
Name: Rosy jewfish
Order: Perciformes
Habitat: Marine
Scientific name: Protonibea diacanthus
Name: Rosy perch
Order: Perciformes
Habitat: Marine
Scientific name: Helicolenus dactylopterus
Name: Rosy pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Syngnathus rostellatus
Name: Rosy platy
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Xiphophorus maculatus
Name: Rosy razorfish
Order: Perciformes
Habitat: Marine
Scientific name: Xyrichtys martinicensis
Name: Rosy red minnow
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Pimephales promelas
Name: Rosy reef bass
Order: Perciformes
Habitat: Coral reefs
Scientific name: Pseudanthias smithvanizi
Name: Rosy sculpin
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Sebastolobus alascanus
Name: Rosy sea bass
Order: Perciformes
Habitat: Marine
Scientific name: Centropristis striata
Name: Rosy seabass
Order: Perciformes
Habitat: Marine
Scientific name: Acanthistius cinctus
Name: Rosy snapper
Order: Perciformes
Habitat: Marine
Scientific name: Lutjanus campechanus
Name: Rosy soldierfish
Order: Beryciformes
Habitat: Marine
Scientific name: Myripristis murdjan
Name: Rosy spectacle bass
Order: Perciformes
Habitat: Marine
Scientific name: Liopropoma rosaceum
Name: Rosy stingray
Order: Myliobatiformes
Habitat: Marine
Scientific name: Urolophus armatus
Name: Rosy stonefish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Synanceia horrida
Name: Rosy surgeonfish
Order: Perciformes
Habitat: Marine
Scientific name: Acanthurus rubriolus
Name: Rosy threadfin bream
Order: Perciformes
Habitat: Sandy bottoms
Scientific name: Nemipterus isacanthus
Name: Rosy wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Halichoeres maculipinna
Name: Rosy-lipped batfish
Order: Lophiiformes
Habitat: Marine
Scientific name: Ogcocephalus darwini
Name: Rosycheek Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Amblygobius nocturnus
Name: Rotcod blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Hypleurochilus springeri
Name: Rotenon fish
Order: Perciformes
Habitat: Marine (Likely a misidentification or very rare)
Scientific name: Rotenonichthys
Name: Rough Filefish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Pseudomonacanthus peroni
Name: Rough Puffer
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Lagocephalus sceleratus
Name: Rough Scad
Order: Carangiformes
Habitat: Marine
Scientific name: Trachurus lathami
Name: Rough Triggerfish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Canthidermis maculata
Name: Rough barracuda
Order: Perciformes
Habitat: Marine
Scientific name: Sphyraena tessera
Name: Rough bass
Order: Perciformes
Habitat: Freshwater
Scientific name: Micropterus coosae
Name: Rough blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Parablennius tentacularis
Name: Rough drum
Order: Sciaeniformes
Habitat: Marine
Scientific name: Umbrina ronchus
Name: Rough leatherjacket
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Scobinichthys granulatus
Name: Rough perch
Order: Perciformes
Habitat: Freshwater
Scientific name: Perca fluviatilis
Name: Rough pipefish
Order: Syngnathiformes
Habitat: Marine
Scientific name: Syngnathus typhle
Name: Rough scad
Order: Perciformes
Habitat: Coastal marine
Scientific name: Trachurus trecae
Name: Rough scorpionfish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Scorpaena scrofa
Name: Rough shark
Order: Squaliformes
Habitat: Deep marine
Scientific name: Oxynotus centrina
Name: Rough silverside
Order: Atheriniformes
Habitat: Coastal marine
Scientific name: Kogia breviceps
Name: Rough skin
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Pleuronectes aspera
Name: Rough tooth triggerfish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Canthidermis maculata
Name: Rough triggerfish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Canthidermis maculata
Name: Rough-back stingray
Order: Myliobatiformes
Habitat: Marine
Scientific name: Dasyatis hypostigma
Name: Rough-head Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Chasmodes bosquianus
Name: Rough-head blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Acanthemblemaria hancocki
Name: Rough-scaled toadfish
Order: Batrachoidiformes
Habitat: Marine
Scientific name: Opsanus pardus
Name: Rough-snouted Flounder
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Embassichthys bathybius
Name: Rough-tail stingray
Order: Myliobatiformes
Habitat: Marine
Scientific name: Dasyatis centroura
Name: Roughback batfish
Order: Lophiiformes
Habitat: Deep sandy bottoms
Scientific name: Zalieutes elater
Name: Roughbass
Order: Perciformes
Habitat: Marine
Scientific name: Acanthistius cinctus
Name: Roughfin Sole
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Hippoglossoides elassodon
Name: Roughhead blenny
Order: Blenniiformes
Habitat: Rocky reefs
Scientific name: Labrisomus gobio
Name: Roughjaw Frogfish
Order: Lophiiformes
Habitat: Marine
Scientific name: Antennarius scaber
Name: Roughneck Grouper
Order: Perciformes
Habitat: Marine
Scientific name: Epinephelus gabriellae
Name: Roughneck grunt
Order: Perciformes
Habitat: Marine
Scientific name: Pomadasys bennettii
Name: Roughnose dogfish
Order: Squaliformes
Habitat: Deep marine
Scientific name: Deania calcea
Name: Roughridge Dogfish
Order: Squaliformes
Habitat: Marine
Scientific name: Oxynotus paradoxus
Name: Roughscale flathead
Order: Scorpaeniformes
Habitat: Sandy bottoms
Scientific name: Thysanophrys chiltonae
Name: Roughscale sole
Order: Pleuronectiformes
Habitat: Deep sandy bottoms
Scientific name: Clidoderma asperrimum
Name: Roughskin dogfish
Order: Squaliformes
Habitat: Deep marine
Scientific name: Centroscymnus owstoni
Name: Roughsnout grenadier
Order: Gadiformes
Habitat: Marine
Scientific name: Trachyrincus murrayi
Name: Roughy
Order: Stephanoberyciformes
Habitat: Deep marine
Scientific name: Hoplostethus atlanticus
Name: Round Head Seahorse
Order: Syngnathiformes
Habitat: Marine
Scientific name: Hippocampus bargibanti
Name: Round barracuda
Order: Perciformes
Habitat: Marine
Scientific name: Sphyraena obtusata
Name: Round betta
Order: Ovalentaria
Habitat: Freshwater
Scientific name: Betta imbellis
Name: Round croaker
Order: Perciformes
Habitat: Marine
Scientific name: Umbrina coroides
Name: Round dolphin
Order: Perciformes
Habitat: Marine (Mahi-Mahi)
Scientific name: Coryphaena hippurus
Name: Round drum
Order: Perciformes
Habitat: Marine
Scientific name: Umbrina coroides
Name: Round flounder
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Bothus podas
Name: Round goby
Order: Perciformes
Habitat: Freshwater/Marine
Scientific name: Neogobius melanostomus
Name: Round herring
Order: Clupeiformes
Habitat: Marine
Scientific name: Etrumeus teres
Name: Round lizardfish
Order: Aulopiformes
Habitat: Marine
Scientific name: Saurida globosa
Name: Round pompano
Order: Perciformes
Habitat: Marine
Scientific name: Trachinotus falcatus
Name: Round ray
Order: Myliobatiformes
Habitat: Marine
Scientific name: Taeniura grabata
Name: Round robin
Order: Perciformes
Habitat: Marine
Scientific name: Megalops cyprinoides
Name: Round rockfish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Sebastes nebulosus
Name: Round sardinella
Order: Clupeiformes
Habitat: Marine
Scientific name: Sardinella aurita
Name: Round scad
Order: Carangiformes
Habitat: Marine
Scientific name: Decapterus punctatus
Name: Round scorpionfish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Scorpaena rascassoides
Name: Round seahorse
Order: Syngnathiformes
Habitat: Marine
Scientific name: Hippocampus kuda
Name: Round skate
Order: Rajiformes
Habitat: Marine
Scientific name: Raja eglanteria
Name: Round stingray
Order: Myliobatiformes
Habitat: Marine
Scientific name: Urobatis halleri
Name: Round whitefish
Order: Salmoniformes
Habitat: Freshwater
Scientific name: Prosopium cylindraceum
Name: Rounded lizardfish
Order: Aulopiformes
Habitat: Marine
Scientific name: Synodus fuscomaculatus
Name: Rounded triggerfish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Canthidermis maculata
Name: Roundhead
Order: Perciformes
Habitat: Marine
Scientific name: Cephalopholis sonnerati
Name: Roundhead Catfish
Order: Siluriformes
Habitat: Freshwater
Scientific name: Otocinclus cocama
Name: Roundhead Parrotfish
Order: Labriformes
Habitat: Marine
Scientific name: Chlorurus strongylocephalus
Name: Roundnose Flounder
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Glyptocephalus cynoglossus
Name: Roussel's Goby
Order: Gobiiformes
Habitat: Freshwater
Scientific name: Glossogobius rousseli
Name: Rover
Order: Perciformes
Habitat: Marine
Scientific name: Labracoglossa argenteiventris
Name: Roving coral grouper
Order: Perciformes
Habitat: Marine
Scientific name: Plectropomus pessuliferus
Name: Roving coralgrouper
Order: Perciformes
Habitat: Coral reefs
Scientific name: Plectropomus pessuliferus
Name: Royal Angelfish
Order: Perciformes
Habitat: Marine
Scientific name: Pygoplites diacanthus
Name: Royal Basslet
Order: Perciformes
Habitat: Marine
Scientific name: Gramma loreto
Name: Royal Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Ecsenius midas
Name: Royal Cardinalfish
Order: Kurtiformes
Habitat: Marine
Scientific name: Apogon perlitus
Name: Royal Dottyback
Order: Perciformes
Habitat: Marine
Scientific name: Gramma loreto
Name: Royal Filefish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Aluterus schoepfii
Name: Royal Gamma
Order: Perciformes
Habitat: Marine
Scientific name: Gramma loreto
Name: Royal Gourami
Order: Anabantiformes
Habitat: Freshwater
Scientific name: Osphronemus laticlavia
Name: Royal Gramma
Order: Perciformes
Habitat: Marine
Scientific name: Gramma loreto
Name: Royal Slender Mudskipper
Order: Gobiiformes
Habitat: Brackish
Scientific name: Periophthalmus novemradiatus
Name: Royal Tang
Order: Acanthuriformes
Habitat: Marine
Scientific name: Paracanthurus hepatus
Name: Royal angelfish
Order: Perciformes
Habitat: Coral reefs
Scientific name: Pygoplites diacanthus
Name: Royal basslet
Order: Perciformes
Habitat: Coral reefs
Scientific name: Gramma loreto
Name: Royal dottyback
Order: Perciformes
Habitat: Coral reefs
Scientific name: Pseudochromis paccagnellae
Name: Royal gramma
Order: Perciformes
Habitat: Coral reefs
Scientific name: Gramma loreto
Name: Royal pleco
Order: Siluriformes
Habitat: Freshwater
Scientific name: Panaque nigrolineatus
Name: Royal wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Paracheilinus cyaneus
Name: Rubberlip grunt
Order: Perciformes
Habitat: Marine
Scientific name: Plectorhinchus multilineatus
Name: Rubberman Wrasse
Order: Labriformes
Habitat: Marine
Scientific name: Cirrhilabrus rubrisquamis
Name: Rubbernose pupfish
Order: Cyprinodontiformes
Habitat: Freshwater
Scientific name: Cyprinodon rubrofluviatilis
Name: Rubin's Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Ecsenius rubinus
Name: Ruby Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Ecsenius rubidus
Name: Ruby Cardinalfish
Order: Kurtiformes
Habitat: Marine
Scientific name: Zoramia rubrisquamis
Name: Ruby Red Dragonet
Order: Syngnathiformes
Habitat: Marine
Scientific name: Synchiropus sycorax
Name: Ruby red dragonet
Order: Callionymiformes
Habitat: Marine
Scientific name: Synchiropus sycorax
Name: Ruby snapper
Order: Perciformes
Habitat: Deep reefs
Scientific name: Etelis carbunculus
Name: Ruby wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Thalassoma rubrovincinctum
Name: Rudalle's stargazer
Order: Uranoscopiformes
Habitat: Marine
Scientific name: Uranoscopus bicinctus
Name: Rudd
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Scardinius erythrophthalmus
Name: Rudderfish
Order: Perciformes
Habitat: Marine
Scientific name: Kyphosus bigibbus
Name: Ruddfish
Order: Cypriniformes
Habitat: Freshwater
Scientific name: Scardinius erythrophthalmus
Name: Rueppell's dottyback
Order: Perciformes
Habitat: Marine
Scientific name: Pseudochromis rueppellii
Name: Ruffe
Order: Perciformes
Habitat: Freshwater
Scientific name: Gymnocephalus cernua
Name: Rufous Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Omobranchus rutilus
Name: Rufous fantail
Order: Perciformes
Habitat: Marine
Scientific name: Rhipidura rufifrons
Name: Rufous rockcod
Order: Perciformes
Habitat: Marine
Scientific name: Epinephelus rufus
Name: Rufous sea bass
Order: Perciformes
Habitat: Marine
Scientific name: Hypoplectrus unicolor
Name: Rugose moray
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax rugosus
Name: Rummy nose tetra
Order: Characiformes
Habitat: Freshwater
Scientific name: Hemigrammus rhodostomus
Name: Rummy-nose tetra
Order: Characiformes
Habitat: Freshwater
Scientific name: Hemigrammus rhodostomus
Name: Rummynose tetra
Order: Characiformes
Habitat: Freshwater rivers
Scientific name: Hemigrammus rhodostomus
Name: Runabout Goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobiopsis macrostoma
Name: Runner
Order: Carangiformes
Habitat: Marine
Scientific name: Elagatis bipinnulata
Name: Runner Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Ecsenius lividanalis
Name: Rupes
Order: Perciformes
Habitat: Coral reefs
Scientific name: Acanthurus rupes
Name: Rupiah moray
Order: Anguilliformes
Habitat: Marine
Scientific name: Gymnothorax rupiah
Name: Rush lamprey
Order: Petromyzontiformes
Habitat: Freshwater streams
Scientific name: Lampetra richardsoni
Name: Russetfin rockfish
Order: Scorpaeniformes
Habitat: Marine
Scientific name: Sebastes proriger
Name: Russia wrasse
Order: Perciformes
Habitat: Marine
Scientific name: Halichoeres rubricephalus
Name: Russian sturgeon
Order: Acipenseriformes
Habitat: Freshwater rivers and coastal marine
Scientific name: Acipenser gueldenstaedtii
Name: Rusty Blenny
Order: Blenniiformes
Habitat: Marine
Scientific name: Ecsenius ops
Name: Rusty Hogfish
Order: Labriformes
Habitat: Marine
Scientific name: Bodianus unimaculatus
Name: Rusty Parrotfish
Order: Labriformes
Habitat: Marine
Scientific name: Scarus ferrugineus
Name: Rusty Seabream
Order: Spariformes
Habitat: Marine
Scientific name: Boops boops
Name: Rusty blenny
Order: Blenniiformes
Habitat: Rocky shores
Scientific name: Parablennius sanguinolentus
Name: Rusty cardinalfish
Order: Perciformes
Habitat: Marine
Scientific name: Apogon evermanni
Name: Rusty dab
Order: Pleuronectiformes
Habitat: Sandy bottoms
Scientific name: Limanda ferruginea
Name: Rusty flounder
Order: Pleuronectiformes
Habitat: Marine
Scientific name: Pleuronectes ferruginea
Name: Rusty goby
Order: Gobiiformes
Habitat: Marine
Scientific name: Gobius niger
Name: Rusty parrotfish
Order: Perciformes
Habitat: Marine
Scientific name: Sparisoma rubripinne
Name: Rusty pipefish
Order: Syngnathiformes
Habitat: Seagrass beds
Scientific name: Syngnathus floridae
Name: Rusty sorcerer
Order: Scorpaeniformes
Habitat: Rocky reefs
Scientific name: Scorpaena rascacio
Name: Rusty triggerfish
Order: Tetraodontiformes
Habitat: Marine
Scientific name: Sufflamen bursa
Name: Rye fish
Order: Perciformes
Habitat: Marine
Scientific name: Arctoscopus japonicus
Name: Rylstone goby
Order: Gobiiformes
Habitat: Estuarine
Scientific name: Tasmanogobius globiceps
| Name | Order | Habitat | Scientific name |
|---|---|---|---|
| Rabauld's pipefish | Syngnathiformes | Marine | Corythoichthys ocellatus |
| Rabbitfish | Siganiformes | Coral reefs and seagrass beds | Siganus rivulatus |
| Rabble-rouser wrasse | Perciformes | Marine | Cirrhilabrus labontei |
| Raccoon butterflyfish | Perciformes | Coral reefs | Chaetodon lunula |
| Racoon butterflyfish | Perciformes | Marine | Chaetodon lunula |
| Raddled grunt | Perciformes | Marine | Pomadasys opercularis |
| Raddled grunter | Perciformes | Freshwater | Amniataba percoidea |
| Radiant parrotfish | Perciformes | Marine | Sparisoma radians |
| Radiant razorfish | Perciformes | Sandy bottoms of coral reefs | Iniistius radiatus |
| Radiant wrasse | Perciformes | Coral reefs | Halichoeres radiatus |
| Radiated shanny | Perciformes | Marine | Ulvaria subbifurcata |
| Radiated snake eel | Anguilliformes | Marine | Myrichthys colubrinus |
| Radical Moray | Anguilliformes | Marine | Gymnothorax radicalis |
| Radioactive blenny | Perciformes | Marine | Acanthemblemaria aspera |
| Raggard sculpin | Scorpaeniformes | Marine | Icelus rastrinoides |
| Ragged-fin triggerfish | Tetraodontiformes | Marine | Sufflamen verres |
| Ragged-tooth Shark | Lamniformes | Marine | Odontaspis ferox |
| Ragged-tooth shark | Orectolobiformes | Marine | Odontaspis ferox |
| Raggie | Orectolobiformes | Marine | Odontaspis taurus |
| Rah rah blenny | Perciformes | Marine | Ecsenius yaeyamaensis |
| Rainbow Cichlid | Cichliformes | Freshwater | Herotilapia multispinosa |
| Rainbow Goby | Gobiiformes | Marine | Stonogobiops rainbowi |
| Rainbow Runner | Carangiformes | Marine | Elagatis bipinnulata |
| Rainbow Trout | Salmoniformes | Freshwater/Brackish | Oncorhynchus mykiss |
| Rainbow chub | Cypriniformes | Freshwater | Opsariichthys uncirostris |
| Rainbow darter | Perciformes | Freshwater streams | Etheostoma caeruleum |
| Rainbow runner | Carangiformes | Marine | Elagatis bipinnulata |
| Rainbow sardine | Clupeiformes | Marine | Dussumieria acuta |
| Rainbow smelt | Osmeriformes | Coastal marine and freshwater lakes | Osmerus mordax |
| Rainbow wrasse | Perciformes | Marine | Halichoeres pictus |
| Rainbowfish | Atheriniformes | Freshwater streams and lakes | Melanotaeniidae |
| Rainbownose shark | Carcharhiniformes | Marine | Carcharhinus obsolerus |
| Raja belangeri | Rajiformes | Marine | Raja belangeri |
| Raja binoculata | Rajiformes | Marine | Beringraja binoculata |
| Raja clavata | Rajiformes | Marine | Raja clavata |
| Raja eglanteria | Rajiformes | Marine | Raja eglanteria |
| Raja radiata | Rajiformes | Marine | Amblyraja radiata |
| Rajah Brooke's pipefish | Syngnathiformes | Marine and estuarine | Syngnathus rajabrookei |
| Rajah's tang | Perciformes | Marine | Acanthurus nigricans |
| Rakali | Rodentia | Freshwater (often mistaken for fish) | Hydromys chrysogaster |
| Rakery Goby | Gobiiformes | Marine | Amblyeleotris rakan |
| Ram cichlid | Cichliformes | Freshwater | Mikrogeophagus ramirezi |
| Ram-horned helmetfish | Scorpaeniformes | Marine | Scorpaenopsis ramaraoi |
| Rambosa Catfish | Siluriformes | Freshwater | Pimelodella ramirezi |
| Ramirez's dwarf cichlid | Perciformes | Freshwater | Apistogramma ramirezi |
| Ramora | Perciformes | Marine | Echeneis naucrates |
| Ramsay's trevally | Carangiformes | Marine | Carangoides ramsayi |
| Randall's Goby | Gobiiformes | Marine | Amblyeleotris randalli |
| Randall's Wrasse | Labriformes | Marine | Cirrhilabrus randalli |
| Randall's frogfish | Lophiiformes | Marine | Antennarius randalli |
| Randall's goby | Gobiiformes | Marine | Amblyeleotris randalli |
| Randall's snapper | Perciformes | Marine | Lutjanus randall |
| Randall's wrasse | Perciformes | Marine | Halichoeres randalli |
| Ranee snapper | Perciformes | Deep reefs | Pristipomoides amoenus |
| Raney's sand stargazer | Perciformes | Marine | Dactylagnus parvus |
| Rangiroa damselfish | Perciformes | Marine | Pomacentrus rangiroae |
| Ranzani's beaked whale | Cetartiodactyla | Deep offshore waters | Mesoplodon europaeus |
| Ranzania | Tetraodontiformes | Marine | Ranzania laevis |
| Rapa Nui moray eel | Anguilliformes | Marine | Gymnothorax bathyphilum |
| Raphael catfish | Siluriformes | Freshwater | Platydoras armatulus |
| Rapp's Goby | Gobiiformes | Marine | Gnatholepis rappi |
| Rasbora | Cypriniformes | Freshwater | Rasbora borapetensis |
| Rasbora caudimaculata | Cypriniformes | Freshwater | Rasbora caudimaculata |
| Rasbora caverii | Cypriniformes | Freshwater | Rasbora caverii |
| Rasbora cephalotaenia | Cypriniformes | Freshwater | Rasbora cephalotaenia |
| Rasbora daniconius | Cypriniformes | Freshwater | Rasbora daniconius |
| Rasbora dorsiocellata | Cypriniformes | Freshwater | Rasbora dorsiocellata |
| Rasbora einthovenii | Cypriniformes | Freshwater | Rasbora einthovenii |
| Rasbora elegans | Cypriniformes | Freshwater | Rasbora elegans |
| Rasbora heteromorpha | Cypriniformes | Freshwater | Trigonostigma heteromorpha |
| Rasbora kalochroma | Cypriniformes | Freshwater | Rasbora kalochroma |
| Rasbora sumatrana | Cypriniformes | Freshwater | Rasbora sumatrana |
| Rasbora trilineata | Cypriniformes | Freshwater | Rasbora trilineata |
| Rasbora vaterifloris | Cypriniformes | Freshwater | Rasbora vaterifloris |
| Raspbelly drum | Perciformes | Marine | Umbrina coroides |
| Raspberry basslet | Perciformes | Coral reefs | Gramma melacara |
| Raspberry damselfish | Perciformes | Marine | Pomacentrus alleni |
| Raspy moray | Anguilliformes | Marine | Gymnothorax verrucosus |
| Raspy scorpionfish | Channichthyiformes | Marine | Gymnapistes marmoratus |
| Raster goby | Gobiiformes | Coral reefs and sandy bottoms | Gnatholepis anjeriana |
| Rastrelliger | Perciformes | Marine | Rastrelliger kanagurta |
| Rastrelliger mackerel | Scombriformes | Tropical and subtropical Indo-Pacific | Rastrelliger |
| Rastrojosa goby | Gobiiformes | Marine | Gobius xanthocephalus |
| Rat-tail | Gadiformes | Marine (Family of deep-sea fish) | Macrouridae |
| Rat-tailed Flounder | Pleuronectiformes | Freshwater/Brackish | Trinectes maculatus |
| Rat-tailed dragonfish | Stomiiformes | Marine | Malacosteus niger |
| Rat-tailed grenadier | Gadiformes | Marine | Coryphaenoides rupestris |
| Ratfish | Chimaeriformes | Deep marine | Hydrolagus colliei |
| Rather Blenny | Blenniiformes | Marine | Meiacanthus crinitus |
| Rattail | Gadiformes | Marine | Macrouridae |
| Rattail blenny | Perciformes | Marine | Pteroscirtes variabilis |
| Rattlesnake fish | Aulopiformes | Marine | Talismania bifurcata |
| Rattlesnake moray | Anguilliformes | Marine | Muraena clepsydra |
| Raukawa hapuku | Perciformes | Marine | Polyprion oxygeneios |
| Raven croaker | Perciformes | Marine | Umbrina roncador |
| Raven hawkfish | Perciformes | Marine | Cyprinocirrhites polyactis |
| Raven's Hook-nosed Pipefish | Syngnathiformes | Marine | Phyllopteryx taeniolatus |
| Ravenfish | Batrachoidiformes | Marine | Batrachoides grunniens |
| Ray's sea catfish | Siluriformes | Marine | Ariopsis raysi |
| Rayed pearlfish | Ophidiiformes | Commensal in sea cucumbers | Carapus bermudensis |
| Rays bream | Perciformes | Deep marine | Brama brama |
| Razor ribbonfish | Lampriformes | Marine | Eumecichthys fiski |
| Razor wrasse | Perciformes | Marine (Also Razorfish) | Iniistius novacula |
| Razorback sucker | Cypriniformes | Freshwater | Xyrauchen texanus |
| Razorfine catfish | Siluriformes | Freshwater | Pimelodus floridai |
| Razorfish | Syngnathiformes | Marine | Aeoliscus strigatus |
| Rebblenose moray | Anguilliformes | Marine | Gymnothorax reevesae |
| Rebblenose pipefish | Syngnathiformes | Marine | Corythoichthys ocellatus |
| Reckoning wrasse | Perciformes | Marine | Bodianus opercularis |
| Red Barb | Cypriniformes | Freshwater streams and rivers | Barbodes semifasciolatus |
| Red Irish lord | Scorpaeniformes | Marine | Hemilepidotus hemilepidotus |
| Red Sea Clownfish | Perciformes | Marine | Amphiprion bicinctus |
| Red Sea Goatfish | Perciformes | Marine | Parupeneus forsskali |
| Red Sea Mimic Blenny | Blenniiformes | Marine | Plagiotremus tapeinosoma |
| Red Sea Riffle Fish | Cyprinodontiformes | Freshwater/Brackish | Aphanius dispar |
| Red Sea Sohal Surgeonfish | Acanthuriformes | Marine | Acanthurus sohal |
| Red Sea Whiptail | Perciformes | Marine | Pentapodus emeryii |
| Red Spotted Goby | Gobiiformes | Marine | Amblygobius phalaena |
| Red Striped Hogfish | Labriformes | Marine | Bodianus rubrispina |
| Red Swellshark | Carcharhiniformes | Marine | Cephaloscyllium expansum |
| Red banded parrotfish | Perciformes | Marine | Sparisoma viride |
| Red banded seabream | Perciformes | Marine | Pagrus auriga |
| Red banded wrasse | Perciformes | Marine | Halichoeres opercularis |
| Red barracuda | Perciformes | Marine | Sphyraena pinguis |
| Red bass | Perciformes | Marine | Lutjanus bohar |
| Red bellied piranha | Characiformes | Freshwater | Pygocentrus nattereri |
| Red cheek parrotfish | Perciformes | Marine | Sparisoma notatum |
| Red cornetfish | Syngnathiformes | Marine | Fistularia petimba |
| Red devil cichlid | Cichliformes | Freshwater lakes | Amphilophus labiatus |
| Red dot triggerfish | Tetraodontiformes | Marine | Canthidermis maculata |
| Red drum | Perciformes | Estuaries and coastal marine | Sciaenops ocellatus |
| Red emperor | Perciformes | Marine | Lutjanus sebae |
| Red emperor snapper | Perciformes | Coral reefs | Lutjanus sebae |
| Red eyed piranha | Characiformes | Freshwater | Serrasalmus rhombeus |
| Red fantail darter | Perciformes | Freshwater | Etheostoma flabellare |
| Red filament wrasse | Perciformes | Marine | Paracheilinus filamentosus |
| Red fin fusilier | Perciformes | Marine | Pterocaesio digramma |
| Red finned parrotfish | Perciformes | Marine | Sparisoma taeniopterum |
| Red flounder | Pleuronectiformes | Marine | Pseudopleuronectes americanus |
| Red grouper | Perciformes | Reefs and rocky bottoms | Epinephelus morio |
| Red groupers | Perciformes | Marine | Epinephelus morio |
| Red hind | Perciformes | Marine | Epinephelus guttatus |
| Red hogfish | Perciformes | Marine | Lachnolaimus maximus |
| Red horse minnow | Cypriniformes | Freshwater streams and rivers | Moxostoma erythrurum |
| Red irish lord | Scorpaeniformes | Coastal marine | Hemilepidotus hemilepidotus |
| Red kingfish | Perciformes | Coral reefs and rocky bottoms | Priacanthus hamrur |
| Red koi | Cypriniformes | Freshwater ponds and streams | Cyprinus rubrofuscus |
| Red lionfish | Scorpaeniformes | Coral reefs | Pterois volitans |
| Red lipped batfish | Lophiiformes | Marine | Ogcocephalus darwini |
| Red lipped blenny | Perciformes | Marine | Ophioblennius atlanticus |
| Red lizardfish | Aulopiformes | Marine | Synodus synodus |
| Red mariana blenny | Perciformes | Marine | Cirripectes kuwamurai |
| Red morwong | Perciformes | Marine | Cheilodactylus fuscus |
| Red mullet | Perciformes | Marine | Mullus surmuletus |
| Red mullett | Perciformes | Marine | Mullus surmuletus |
| Red mulloway | Perciformes | Coastal estuarine waters | Argyrosomus japonicas |
| Red pacu | Characiformes | Freshwater rivers and floodplains | Piaractus brachypomus |
| Red pandora | Perciformes | Deep marine | Pagellus bogaraveo |
| Red paperfish | Syngnathiformes | Marine | Taenianotus triacanthus |
| Red pargo | Perciformes | Marine | Pagrus pagrus |
| Red parrotfish | Perciformes | Marine | Sparisoma aurofrenatum |
| Red perch | Perciformes | Marine | Sebastes marinus |
| Red pomfret | Perciformes | Marine | Brama brama |
| Red porgy | Perciformes | Marine | Pagrus pagrus |
| Red razorfish | Perciformes | Sandy bottoms | Xyrichtys novacula |
| Red salmon | Salmoniformes | Freshwater/Marine | Oncorhynchus nerka |
| Red scorpionfish | Perciformes | Marine | Scorpaena scrofa |
| Red sea anemonefish | Perciformes | Marine | Amphiprion bicinctus |
| Red sea bannerfish | Perciformes | Marine | Heniochus intermedius |
| Red sea bream | Perciformes | Marine | Pagellus bogaraveo |
| Red sea clownfish | Perciformes | Marine | Amphiprion bicinctus |
| Red sea dab | Pleuronectiformes | Marine | Solea aegyptiaca |
| Red sea goatfish | Perciformes | Marine | Parupeneus forsskali |
| Red sea gurnard | Scorpaeniformes | Marine | Pterygotrigla robertsi |
| Red sea hawkfish | Perciformes | Marine | Paracirrhites forsteri |
| Red sea hogfish | Perciformes | Marine | Bodianus opercularis |
| Red sea parrotfish | Perciformes | Marine | Scarus russelii |
| Red sea snapper | Perciformes | Marine | Lutjanus ehrenbergii |
| Red sea wrasse | Perciformes | Marine | Symphodus cinereus |
| Red seabream | Perciformes | Coastal marine | Pagrus major |
| Red snapper | Perciformes | Reefs and rocky bottoms | Lutjanus campechanus |
| Red spot emperors | Perciformes | Marine | Lethrinus erythracanthus |
| Red spot goby | Perciformes | Marine | Amblygobius pholegandros |
| Red spot grouper | Perciformes | Marine | Epinephelus chlorostigma |
| Red spot hawkfish | Perciformes | Marine | Paracirrhites punctatus |
| Red spot parrotfish | Perciformes | Marine | Sparisoma chrysopterum |
| Red spot wrasse | Perciformes | Marine | Halichoeres marginatus |
| Red spotted hawkfish | Perciformes | Marine | Amblycirrhitus bimaculatus |
| Red spotted jewelfish | Cichliformes | Freshwater rivers and lakes | Hemichromis guttatus |
| Red squirrelfish | Holocentriformes | Marine | Sargocentron rubrum |
| Red streak parrotfish | Perciformes | Marine | Sparisoma rubripinne |
| Red swamp crayfish | Decapoda | Freshwater (often considered an ecological pest when invasive) | Procambarus clarkii |
| Red swamp eel | Synbranchiformes | Freshwater | Monopterus albus |
| Red tail barbel | Cypriniformes | Freshwater | Barbus barbus |
| Red tail catfish | Siluriformes | Freshwater | Phractocephalus hemioliopterus |
| Red tail pipefish | Syngnathiformes | Marine | Dunckerocampus dactyliophorus |
| Red tailed shark | Cypriniformes | Freshwater | Epalzeorhynchos bicolor |
| Red throat emperor | Perciformes | Coral reefs and rocky bottoms | Lethrinus miniatus |
| Red tipped shark | Carcharhiniformes | Marine | Carcharhinus altimus |
| Red tooth triggerfish | Tetraodontiformes | Marine | Odonus niger |
| Red triggerfish | Tetraodontiformes | Marine | Balistes polylepis |
| Red velvet wrasse | Perciformes | Coral reefs | Cirrhilabrus exquisitus |
| Red velvetfish | Scorpaeniformes | Marine | Gnathanacanthus goetzeei |
| Red whipray | Myliobatiformes | Marine | Himantura uarnak |
| Red winged blenny | Perciformes | Marine | Cirripectes stigmapterus |
| Red-banded Cardinalfish | Kurtiformes | Marine | Apogon doederleini |
| Red-banded wrasse | Perciformes | Marine | Halichoeres opercularis |
| Red-bellied Piranha | Characiformes | Freshwater | Pygocentrus nattereri |
| Red-bellied piranha | Characiformes | Freshwater | Pygocentrus nattereri |
| Red-breasted wrasse | Perciformes | Marine | Symphodus melops |
| Red-cheeked Blenny | Blenniiformes | Marine | Ecsenius pictus |
| Red-edged Triplefin | Blenniiformes | Marine | Tripterygion delaisi |
| Red-finned Kadavu Blenny | Blenniiformes | Marine | Ecsenius kadovuensis |
| Red-finned shark | Cypriniformes | Freshwater | Epalzeorhynchos frenatum |
| Red-handed Shrimp Goby | Gobiiformes | Marine | Ctenogobiops fernaldi |
| Red-headed Goby | Gobiiformes | Marine | Elacatinus puncticulatus |
| Red-lipped Batfish | Lophiiformes | Marine | Ogcocephalus darwini |
| Red-lipped batfish | Lophiiformes | Marine | Ogcocephalus darwini |
| Red-lipped blenny | Blenniiformes | Marine | Ophioblennius atlanticus |
| Red-margined Triggerfish | Tetraodontiformes | Marine | Sufflamen chrysopterum |
| Red-mouthed Triggerfish | Tetraodontiformes | Marine | Sufflamen fraenatum |
| Red-mouthed rockfish | Scorpaeniformes | Marine | Sebastes miniatus |
| Red-ridged Blenny | Blenniiformes | Marine | Ecsenius gravieri |
| Red-saddled Toby | Tetraodontiformes | Marine | Canthigaster coronata |
| Red-socket Goby | Gobiiformes | Marine | Cryptocentrus albidorsus |
| Red-spot wrasse | Perciformes | Marine | Coris aygula |
| Red-spotted Hawkfish | Perciformes | Marine | Paracirrhites forsteri |
| Red-spotted Shrimp Goby | Gobiiformes | Marine | Amblyeleotris guttata |
| Red-spotted blenny | Blenniiformes | Marine | Aidablennius sphynx |
| Red-striped Squirrelfish | Holocentriformes | Marine | Sargocentron rubrum |
| Red-tail barracuda | Perciformes | Marine | Sphyraena barracuda |
| Red-tentacled Blenny | Blenniiformes | Marine | Ecsenius tentaculatus |
| Red-tipped Coral Goby | Gobiiformes | Marine | Gobiodon rivulatus |
| Red-tipped halfbeak | Beloniformes | Marine | Hemiramphus marginatus |
| Red-tipped reef crab | Decapoda | Rocky intertidal zones | Percnon planissimum |
| Redback wrasse | Perciformes | Marine | Paracheilinus mccoskeri |
| Redband parrotfish | Perciformes | Marine | Sparisoma aurofrenatum |
| Redbanded parrotfish | Perciformes | Coral reefs | Sparisoma aurofrenatum |
| Redbarred sandperch | Perciformes | Marine | Parapercis hexophtalma |
| Redbellied piranha | Characiformes | Freshwater | Pygocentrus nattereri |
| Redbelly blenny | Blenniiformes | Marine | Ecsenius axelrodi |
| Redbelly tilapia | Cichliformes | Freshwater | Coptodon zillii |
| Redbreast sunfish | Perciformes | Freshwater rivers and lakes | Lepomis auritus |
| Redbreasted maomao | Perciformes | Marine | Caprodon longimanus |
| Redcap goby | Gobiiformes | Coral reefs | Elacatinus puncticulatus |
| Redcheek butterfish | Perciformes | Marine | Psenes arafurensis |
| Redcheek parrotfish | Perciformes | Marine | Scarus forsteni |
| Redcheek wrasse | Perciformes | Marine | Halichoeres rubricephalus |
| Redcoat | Perciformes | Marine | Sargocentron rubrum |
| Reddish damselfish | Perciformes | Marine | Pomacentrus rubristigma |
| Reddish scorpionfish | Scorpaeniformes | Marine | Scorpaena rubella |
| Redear sunfish | Perciformes | Freshwater | Lepomis microlophus |
| Redfield's pupfish | Cyprinodontiformes | Freshwater | Empetrichthys latos |
| Redfin | Cypriniformes | Freshwater | Rutilus rutilus |
| Redfin Blue-eye | Atheriniformes | Freshwater (often introduced) | Poecilia reticulata |
| Redfin Perch | Perciformes | Freshwater/Brackish | Perca fluviatilis |
| Redfin Wrasse | Labriformes | Marine | Cirrhilabrus rubripinnis |
| Redfin anthias | Perciformes | Marine | Pseudanthias dispar |
| Redfin perch | Perciformes | Freshwater lakes and rivers | Perca fluviatilis |
| Redfin pickerel | Esociformes | Freshwater | Esox americanus americanus |
| Redfin planyfish | Cyprinodontiformes | Freshwater | Phallichthys pittieri |
| Redfin shovelnose ray | Rajiformes | Marine | Rhinobatos horkelii |
| Redfinned shark | Cypriniformes | Freshwater (Often called Red-tailed shark too) | Epalzeorhynchos frenatum |
| Redfinned whalefish | Stephanoberyciiformes | Marine | Cetomimidae |
| Redfish | Perciformes | Marine | Sebastes viviparus |
| Redhand goby | Gobiiformes | Marine | Stonogobiops nematodes |
| Redhead goby | Gobiiformes | Coral reefs | Elacatinus macrodon |
| Redheaded goby | Gobiiformes | Marine | Elacatinus puncticulatus |
| Redheaded parrotfish | Perciformes | Marine | Chlorurus strongylocephalus |
| Redhorse sucker | Cypriniformes | Freshwater | Moxostoma |
| Redline grouper | Perciformes | Marine | Epinephelus reticulatus |
| Redlined anthias | Perciformes | Marine | Pseudanthias rubrizonatus |
| Redlipped blenny | Blenniiformes | Marine | Ophioblennius atlanticus |
| Redlipped goby | Gobiiformes | Marine | Gobius rubropunctatus |
| Redlipped moray | Anguilliformes | Marine | Gymnothorax chilensis |
| Redlipped pipefish | Syngnathiformes | Marine | Hippichthys heptagonus |
| Redmouth grouper | Perciformes | Marine | Epinephelus mystacinus |
| Redmouth scorpionfish | Scorpaeniformes | Rocky reefs | Scorpaena maderensis |
| Redmouthed grouper | Perciformes | Marine | Cephalopholis sonnerati |
| Rednaped wrasse | Perciformes | Marine | Halichoeres prosopeion |
| Redneck damselfish | Perciformes | Marine | Pomacentrus roosevelti |
| Redpatch anthias | Perciformes | Marine | Pseudanthias rubrilaevis |
| Redpatch hawkfish | Perciformes | Marine | Cirrhitichthys oxycephalus |
| Redside dace | Cypriniformes | Freshwater | Clinostomus elongatus |
| Redspot blenny | Blenniiformes | Marine | Ecsenius stigmatura |
| Redspot fairy wrasse | Perciformes | Marine | Cirrhilabrus punctata |
| Redspot goatfish | Mulliformes | Marine | Parupeneus chrysopleuron |
| Redspot grouper | Perciformes | Marine | Epinephelus magniscuttis |
| Redspot hawkfish | Perciformes | Marine | Cirrhitichthys oxycephalus |
| Redspot wrasse | Perciformes | Marine | Halichoeres stigmaturus |
| Redstripe pipefish | Syngnathiformes | Marine | Dunckerocampus dactyliophorus |
| Redstripe snapper | Perciformes | Marine | Lutjanus synagris |
| Redtail catfish | Siluriformes | Freshwater rivers | Phractocephalus hemioliopterus |
| Redtail coral trout | Perciformes | Coral reefs | Plectropomus oligacanthus |
| Redtailed fusilier | Perciformes | Marine | Caesio cuning |
| Redtailed triggerfish | Tetraodontiformes | Marine | Sufflamen chrysopterum |
| Redtooth triggerfish | Tetraodontiformes | Coral reefs | Odonus niger |
| Redvelvet shrimpfish | Syngnathiformes | Marine | Aeoliscus strigatus |
| Reedfish | Polypteriformes | Freshwater | Erpetoichthys calabaricus |
| Reef anglerfish | Lophiiformes | Marine | Antennarius striatus |
| Reef batfish | Ephippiformes | Marine | Platax pinnatus |
| Reef blenny | Blenniiformes | Marine | Parablennius pilicornis |
| Reef butterflyfish | Perciformes | Marine | Chaetodon sedentarius |
| Reef cod | Perciformes | Marine | Epinephelus corallicola |
| Reef croaker | Perciformes | Marine | Micropogonias undulatus |
| Reef flat angelfish | Perciformes | Marine | Pomacanthus annularis |
| Reef stonefish | Scorpaeniformes | Coral reefs and rocky bottoms | Synanceia verrucosa |
| Reef triggerfish | Tetraodontiformes | Marine | Rhinecanthus aculeatus |
| Reef whitetip shark | Carcharhiniformes | Marine | Triaenodon obesus |
| Regal Angelfish | Perciformes | Marine | Pygoplites diacanthus |
| Regal Damselfish | Perciformes | Marine | Neoglyphidodon thoracotaeniatus |
| Regal Dottyback | Perciformes | Marine | Pseudochromis aldabraensis |
| Regal Jumper Blenny | Blenniiformes | Marine | Omobranchus ferox |
| Regal angelfish | Perciformes | Coral reefs | Pygoplites diacanthus |
| Regal damselfish | Perciformes | Coral reefs | Neoglyphidodon thoracotaeniatus |
| Regal demoiselle | Perciformes | Marine | Neopomacentrus nemurus |
| Regal dotsnapper | Perciformes | Marine | Lutjanus madras |
| Regal parrotfish | Perciformes | Marine | Scaridae chrysopterus |
| Regal sea snake | Elapidae | Marine | Hydrophis stokesii |
| Regal tang | Perciformes | Coral reefs | Paracanthurus hepatus |
| Regal tilefish | Perciformes | Marine | Hoplolatilus starcki |
| Regan's parrotfish | Perciformes | Marine | Scarus regani |
| Regan's seahorse | Syngnathiformes | Marine | Hippocampus reidi |
| Reggie's damselfish | Perciformes | Marine | Pomacentrus reedi |
| Regulus fish | Syngnathiformes | Marine | Corythoichthys regulus |
| Reid's Sea Dragon | Syngnathiformes | Marine | Phyllopteryx reidi |
| Reid's pipefish | Syngnathiformes | Marine | Corythoichthys reidi |
| Reinbolt's damselfish | Perciformes | Marine | Pomacentrus reini |
| Reinhard's flounder | Pleuronectiformes | Marine | Reinhardtius hippoglossoides |
| Reinhardt's flatfish | Pleuronectiformes | Marine | Pleuronectes quadrituberculatus |
| Reinhardtius halibut | Pleuronectiformes | Marine | Reinhardtius hippoglossoides |
| Rembrandt Goby | Gobiiformes | Marine | Amblygobius bynoensis |
| Remora | Perciformes | Marine | Echeneis naucrates |
| Remora remora | Perciformes | Marine | Remora remora |
| Rendahl's Goby | Gobiiformes | Marine | Sueviotrilus rendalli |
| Requiem shark | Carcharhiniformes | Marine | Carcharhinus longimanus |
| Retaliator blenny | Perciformes | Marine | Aspidontus taeniatus |
| Retaliator goby | Gobiiformes | Marine | Discordipinna griessingeri |
| Reticulated Dragonet | Syngnathiformes | Marine | Synchiropus reticulatus |
| Reticulated dragonet | Perciformes | Sandy and muddy bottoms | Symphypleura reticulata |
| Reticulated hillstream loach | Cypriniformes | Freshwater | Sewellia lineolata |
| Reticulated moray | Anguilliformes | Marine | Gymnothorax reticularis |
| Reticulated puffer | Tetraodontiformes | Coral reefs | Arothron reticularis |
| Reticulated pufferfish | Tetraodontiformes | Marine | Arothron reticularis |
| Reticulated stargazer | Uranoscopiformes | Marine | Uranoscopus reticulatus |
| Reticulated surgeonfish | Acanthuriformes | Marine | Acanthurus reticulatus |
| Reticulated swellshark | Carcharhiniformes | Marine | Cephaloscyllium retifer |
| Reticulated tilefish | Perciformes | Marine | Hoplolatilus reticulatus |
| Reticulated whipray | Myliobatiformes | Marine and estuarine | Himantura uarnak |
| Reuleaux's blenny | Perciformes | Marine | Ecsenius reitmeri |
| Reunion seahorse | Syngnathiformes | Marine | Hippocampus borboniensis |
| Reversed blenny | Blenniiformes | Marine | Aidablennius scabra |
| Rex sole | Pleuronectiformes | Deep sandy and muddy bottoms | Glyptocephalus zachirus |
| Rhadinesthes decimus | Stomiiformes | Marine | Rhadinesthes decimus |
| Rhamphochromis | Cichliformes | Freshwater lakes | Rhamphochromis |
| Rhamphorhynchus Goby | Gobiiformes | Marine | Rhamphocottus richardsonii |
| Rhinecanthus rectangulus | Tetraodontiformes | Marine | Rhinecanthus rectangulus |
| Rhino Razorfish | Perciformes | Marine | Iniistius novacula |
| Rhino blenny | Blenniiformes | Coral reefs | Cirripectes albolimus |
| Rhino pipefish | Syngnathiformes | Marine | Corythoichthys ocellatus |
| Rhino ray | Rhinopristiformes | Marine | Rhina ancylostomus |
| Rhino sculpin | Scorpaeniformes | Freshwater | Cottus asperrima |
| Rhinobatos rhinobatos | Rhinopristiformes | Marine | Rhinobatos rhinobatos |
| Rhinoceros Blenny | Blenniiformes | Marine | Meiacanthus rhinoceratus |
| Rhinoceros fish | Clupeiformes | Marine | Chirocentrus dorab |
| Rhinoceros leatherjacket | Tetraodontiformes | Marine | Pseudalutarius nasicornis |
| Rhinochimaera | Chimaeriformes | Marine | Rhinochimaera atlantica |
| Rhinochimaera atlantica | Chimaeriformes | Marine | Harriotta raleighana |
| Rhinosinus pipefish | Syngnathiformes | Marine | Halicampus macrorhynchus |
| Rhizoprionodon lalandei | Carcharhiniformes | Marine | Rhizoprionodon lalandei |
| Rhodeus | Cypriniformes | Freshwater streams and ponds | Rhodeus amarus |
| Rhodeus amarus | Cypriniformes | Freshwater | Rhodeus amarus |
| Rhomboid mojarra | Perciformes | Estuarine and coastal marine | Diapterus rhombeus |
| Rhomboid wrasse | Perciformes | Marine | Cirrhilabrus rhomboidalis |
| Rhomboidal triplefin | Tetraodontiformes | Marine | Tripodichthys oxycephalus |
| Rhoplichthys scabra | Scorpaeniformes | Marine | Rhoplichthys scabra |
| Rhyacichthys aspro | Gobiiformes | Freshwater | Rhyacichthys aspro |
| Ribbed blenny | Perciformes | Marine | Parablennius gattorugine |
| Ribbed moray | Anguilliformes | Marine | Gymnothorax richelieu |
| Ribbed pipefish | Syngnathiformes | Marine | Trachyrhamphus longirostris |
| Ribbon eel | Anguilliformes | Coral reefs | Rhinomuraena quaesita |
| Ribbon fish | Ophidiiformes | Deep marine | Trachipterus arcticus |
| Ribbon sawtail | Pleuronectiformes | Marine | Plewronectes modestus |
| Ribbon sawtail fish | Anguilliformes | Deep marine | Serrivomer beanii |
| Ribbon sweetlips | Perciformes | Marine | Plectorhinchus polytaenia |
| Ribbon-finned manefish | Stephanoberyciiformes | Marine | Caristius macropterus |
| Ribbon-finned wrasse | Perciformes | Marine | Xyrichtys novacula |
| Ribbon-tailed stingray | Myliobatiformes | Marine | Taeniura lymma |
| Ribboned pipefish | Syngnathiformes | Marine | Haliichthys taeniophorus |
| Ribboned sweetlips | Perciformes | Marine | Plectorhinchus chaetodonoides |
| Ribbonfish | Lampriformes | Deep marine | Trachipteridae |
| Ribbontail stingray | Myliobatiformes | Marine | Taeniura lymma |
| Rice eel | Synbranchiformes | Freshwater | Monopterus albus |
| Richards' Goby | Gobiiformes | Marine | Cryptocentrus singapurensis |
| Richardson's Dragonet | Syngnathiformes | Marine | Synchiropus richardsonii |
| Richardson's Sculpin | Scorpaeniformes | Freshwater | Cottus richardsonii |
| Richardson's dragonet | Perciformes | Marine | Synchiropus richardsi |
| Richardson's leatherjacket | Tetraodontiformes | Marine | Eubalichthys quadrispinus |
| Richardson's rockfish | Scorpaeniformes | Marine | Sebastes reedi |
| Richter's pipefish | Syngnathiformes | Marine | Solegnathus hardwickii |
| Ricord's goby | Gobiiformes | Marine (Often refers to Sharknose Goby) | Elacatinus oceanops |
| Ridge-snout mullet | Mugiliformes | Marine | Oedalechilus labiosus |
| Ridgeback pipefish | Syngnathiformes | Marine | Corythoichthys intestinalis |
| Ridgeback rockfish | Scorpaeniformes | Marine | Sebastes melanostomus |
| Ridgehead | Ateleopodiformes | Marine | Ateleopus japonicus |
| Riffle sculpin | Scorpaeniformes | Freshwater streams | Cottus gulosus |
| Riflefish | Perciformes | Freshwater/Brackish | Toxotes jaculatrix |
| Righteye flounder | Pleuronectiformes | Marine | Pleuronectes platessa |
| Rigid Goby | Gobiiformes | Marine | Coryphopterus glaucofraenum |
| Rigid pipefish | Syngnathiformes | Seagrass beds | Syngnathus rigidus |
| Rigid seahorse | Syngnathiformes | Marine | Hippocampus erectus |
| Rimscale lanternfish | Myctophiformes | Marine | Lampanyctus rimosus |
| Rindani Cardinalfish | Kurtiformes | Marine | Apogon isus |
| Ring blenny | Blenniiformes | Rocky shores | Parablennius tentacularis |
| Ringed Pipefish | Syngnathiformes | Marine | Doryrhamphus dactyliophorus |
| Ringed Wrasse | Labriformes | Marine | Bodianus axillaris |
| Ringed blenny | Blenniiformes | Marine | Salarias ramosus |
| Ringed butterflyfish | Perciformes | Marine | Chaetodon auriga |
| Ringed filefish | Tetraodontiformes | Marine | Aluterus scriptus |
| Ringed goatfish | Mulliformes | Marine | Upeneus cirrinarius |
| Ringed hawkfish | Perciformes | Marine | Cirrhitichthys ringens |
| Ringed perch | Perciformes | Freshwater rivers | Datnioides undecimradiatus |
| Ringed pipefish | Syngnathiformes | Coral reefs | Dunckerocampus dactyliophorus |
| Ringed puffer | Tetraodontiformes | Marine | Arothron manilensis |
| Ringed wrasse | Perciformes | Marine | Halichoeres annulatus |
| Ringeye goby | Gobiiformes | Coral reefs | Trimmatom nanus |
| Rio Fuerte cichlid | Cichliformes | Freshwater rivers | Herichthys steindachneri |
| Rio Grande cichlid | Cichliformes | Freshwater | Herichthys cyanoguttatus |
| Rio Grande killifish | Cyprinodontiformes | Freshwater | Fundulus zebrinus |
| Rio Grande perch | Perciformes | Freshwater | Herichthys cyanoguttatus |
| Rio de Janeiro killifish | Cyprinodontiformes | Freshwater | Nothobranchius guentheri |
| Riparian Killifish | Cyprinodontiformes | Freshwater | Rivulus hartii |
| Riparian brook lamprey | Petromyzontiformes | Freshwater | Lampetra richardsoni |
| Ripley's cardinalfish | Perciformes | Marine | Apogonichthyoides leptacanthus |
| Ripley's wrasse | Perciformes | Coral reefs | Thalassoma hardwicke |
| Ripple rockfish | Scorpaeniformes | Marine | Sebastes rastrelliger |
| Rippy's cusk-eel | Ophidiiformes | Marine | Ophidion ripi |
| River Blackfish | Perciformes | Freshwater | Gadopsis marmoratus |
| River Moray | Anguilliformes | Freshwater/Brackish | Gymnothorax tile |
| River Perch | Perciformes | Freshwater/Brackish | Perca fluviatilis |
| River Pipefish | Syngnathiformes | Freshwater/Brackish | Syngnathoides biaculeatus |
| River Shark | Carcharhiniformes | Freshwater/Brackish | Glyphis gangeticus |
| River Sturgeon | Acipenseriformes | Freshwater/Brackish | Acipenser medirostris |
| River Tonguefish | Pleuronectiformes | Freshwater/Brackish | Cynoglossus trigrammus |
| River angel | Rajiformes | Marine | Rhinobatos cemiculus |
| River bass | Perciformes | Freshwater | Paradicichthys venenatus |
| River blackfish | Perciformes | Freshwater rivers | Gadopsis marmoratus |
| River bream | Perciformes | Freshwater/Brackish | Acanthopagrus butcheri |
| River carp | Cypriniformes | Freshwater | Labeo pangasia |
| River carpsucker | Cypriniformes | Freshwater | Carpiodes carpio |
| River char | Salmoniformes | Freshwater | Salvelinus alpinus |
| River crab-eater | Perciformes | Marine | Symphurus diomedeanus |
| River croaker | Perciformes | Freshwater | Plagioscion squamosissimus |
| River darter | Perciformes | Freshwater | Percina shumardi |
| River dogfish | Squaliformes | Marine | Scyliorhinus retifer |
| River eel | Anguilliformes | Freshwater/Marine | Anguilla anguilla |
| River gar | Lepisosteiformes | Freshwater | Lepisosteus osseus |
| River garfish | Beloniformes | Estuarine and coastal marine | Belone belone |
| River goby | Gobiiformes | Freshwater/Brackish | Gobius fluviatilis |
| River halfbeak | Beloniformes | Freshwater/Brackish | Zenarchopterus dispar |
| River hatchetfish | Characiformes | Freshwater | Gasteropelecus sternicla |
| River lamprey | Petromyzontiformes | Freshwater rivers and coastal marine | Lampetra fluviatilis |
| River limia | Cyprinodontiformes | Freshwater rivers and springs | Poecilia nicholsi |
| River perch | Perciformes | Freshwater lakes and rivers | Perca fluviatilis |
| River pilchard | Clupeiformes | Freshwater/Brackish | Hypoatherina valenciennei |
| River pipefish | Syngnathiformes | Freshwater | Doryichthys deokhatoides |
| River puffer | Tetraodontiformes | Freshwater | Tetraodon fluviatilis |
| River pupfish | Cyprinodontiformes | Freshwater | Cyprinodon variegatus |
| River ray | Myliobatiformes | Freshwater | Potamotrygon motoro |
| River redhorse | Cypriniformes | Freshwater | Moxostoma carinatum |
| River seahorse | Syngnathiformes | Marine | Hippocampus kuda |
| River shark | Carcharhiniformes | Freshwater rivers and estuaries | Glyphis gangeticus |
| River snapper | Perciformes | Freshwater/Brackish | Lutjanus fuscescens |
| River stickleback | Gasterosteiformes | Freshwater/Brackish | Gasterosteus aculeatus |
| River stingray | Myliobatiformes | Freshwater rivers | Potamotrygon |
| River sturgeon | Acipenseriformes | Freshwater/Brackish | Acipenser fulvescens |
| River tarpon | Elopiformes | Freshwater/Brackish | Megalops cyprinoides |
| River tilefish | Perciformes | Marine | Malacanthus burracanthus |
| River torpedo | Torpediniformes | Marine | Torpedo torpedo |
| River trout | Salmoniformes | Freshwater/Marine | Salmo trutta |
| River whiting | Gadiformes | Marine | Macruronus novaezelandiae |
| Rivetfish | Perciformes | Marine (likely refers to Rivulus or Rivet gobies) | Rivettia |
| Roach | Cypriniformes | Freshwater rivers and lakes | Rutilus rutilus |
| Roanoke bass | Perciformes | Freshwater | Ambloplites cavifrons |
| Roanoke darter | Perciformes | Freshwater | Percina roanoka |
| Roatan Goby | Gobiiformes | Marine | Elacatinus atronasus |
| Robalo | Perciformes | Marine (Common Snook) | Centropomus undecimalis |
| Robber croaker | Perciformes | Marine | Paranibea semiluctuosa |
| Robert's corydoras | Siluriformes | Freshwater | Corydoras robri |
| Roberts' perch | Perciformes | Freshwater | Ambassis robertsi |
| Robin redbreast | Perciformes | Freshwater | Centrarchus macropterus |
| Robins' Cardinalfish | Kurtiformes | Marine | Apogon robinsi |
| Robinson's Anemonefish | Perciformes | Marine | Amphiprion robinsoni |
| Robinson's parrotfish | Perciformes | Marine | Scarus dubius |
| Robust Blenny | Blenniiformes | Marine | Ecsenius bicolor |
| Robust Lizardfish | Aulopiformes | Marine | Synodus robustus |
| Robust Perch | Perciformes | Freshwater | Perca robusta |
| Robust basslet | Perciformes | Marine | Liopropoma aberrans |
| Robust ghost pipefish | Syngnathiformes | Marine | Solenostomus cyanopterus |
| Robust ghostpipefish | Syngnathiformes | Marine | Solenostomus cyanopterus |
| Robust ghostshark | Chimaeriformes | Marine | Hydrolagus pallidus |
| Robust grunt | Perciformes | Marine | Pomadasys punctulatus |
| Robust moray | Anguilliformes | Marine | Gymnothorax robustus |
| Robust pipefish | Syngnathiformes | Marine | Syngnathus robustus |
| Robust sleeper | Gobiiformes | Freshwater/Brackish | Eleotris fusca |
| Robust wrasse | Perciformes | Marine | Halichoeres robustus |
| Rock bass | Perciformes | Freshwater lakes and rivers | Ambloplites rupestris |
| Rock beauty | Perciformes | Coral reefs | Holacanthus tricolor |
| Rock blenny | Blenniiformes | Marine | Ophioblennius macclurei |
| Rock clingfish | Gobiesociformes | Rocky shores | Lepadogaster lepadogaster |
| Rock cod | Gadiformes | Marine | Gadus morhua |
| Rock cook | Perciformes | Rocky reefs | Centrolabrus exoletus |
| Rock crab-eater | Scorpaeniformes | Marine | Sebastolobus alascanus |
| Rock croaker | Perciformes | Coastal marine | Umbrina aurata |
| Rock cusk-eel | Ophidiiformes | Marine | Ophidion rockfish |
| Rock eel | Perciformes | Marine | Pholis gunnellus |
| Rock goby | Gobiiformes | Rocky shores | Gobius paganellus |
| Rock gunnel | Perciformes | Coastal marine | Pholis gunnellus |
| Rock hawkfish | Perciformes | Marine | Cirrhitus rivulatus |
| Rock hind | Perciformes | Rocky reefs | Epinephelus adscensionis |
| Rock hopper blenny | Perciformes | Marine | Istiblennius periophthalmus |
| Rock kabilya | Scorpaeniformes | Rocky reefs | Scorpaenopsis venosa |
| Rock kelpfish | Perciformes | Marine | Chironemus marmoratus |
| Rock knifefish | Gymnotiformes | Freshwater | Eigenmannia virescens |
| Rock kurper | Cichliformes | Freshwater lakes and rivers | Tilapia ruweti |
| Rock lumpsucker | Scorpaeniformes | Coastal marine | Cyclopterus lumpus |
| Rock parrotfish | Perciformes | Marine | Sparisoma rubripinne |
| Rock pipefish | Syngnathiformes | Seagrass beds and rocky reefs | Syngnathus acus |
| Rock prickleback | Perciformes | Marine | Xiphister mucosus |
| Rock sandperch | Perciformes | Sandy and rocky bottoms | Parapercis rockallensis |
| Rock sea bass | Perciformes | Marine | Centropristis philadelphica |
| Rock snapper | Perciformes | Rocky reefs | Lutjanus mahogoni |
| Rock sole | Pleuronectiformes | Sandy and rocky bottoms | Lepidopsetta bilineata |
| Rock spotted blenny | Perciformes | Marine | Parablennius sanguinolentus |
| Rock wrasse | Perciformes | Marine | Halichoeres semicinctus |
| Rocket Frogfish | Lophiiformes | Marine | Antennarius multicellulatus |
| Rocket Garfish | Beloniformes | Marine | Tropidostethus rhothophilus |
| Rocket blenny | Perciformes | Marine | Aspidontus dussumieri |
| Rocket goby | Gobiiformes | Marine | Stonogobiops nematodes |
| Rockfish | Scorpaeniformes | Rocky reefs | Sebastes |
| Rockling | Gadiformes | Marine | Ciliata mustela |
| Rockmover wrasse | Perciformes | Marine | Novaculichthys taeniourus |
| Rockpool Blenny | Blenniiformes | Marine | Parablennius parvicornis |
| Rockpool Goby | Gobiiformes | Marine | Gobius paganellus |
| Rockskipper Blenny | Blenniiformes | Marine | Istiblennius zebra |
| Rocky Mountain whitefish | Salmoniformes | Freshwater | Prosopium williamsoni |
| Rocky shore Blenny | Blenniiformes | Marine | Salarias ramosus |
| Rocky shore clingfish | Gobiesociformes | Marine | Lepadogaster candollii |
| Rodney's tang | Perciformes | Marine | Acanthurus triostegus |
| Roe's parrotfish | Perciformes | Marine | Sparisoma roe |
| Rofus emperor | Perciformes | Marine | Lethrinus rofu |
| Rohu | Cypriniformes | Freshwater | Labeo rohita |
| Rolland's Damselfish | Perciformes | Marine | Plectroglyphidodon rollandi |
| Rollerskates | Rajiformes | Marine | Notoraja tobitukai |
| Rollestoni's stargazer | Trachiniformes | Marine | Gnathagnus rostellatus |
| Romaine's Pipefish | Syngnathiformes | Marine | Corythoichthys rompu |
| Roman snook | Perciformes | Marine | Centropomus undecimalis |
| Roman-nosed snook | Perciformes | Marine | Centropomus pectinatus |
| Roncador | Perciformes | Marine | Umbrina roncador |
| Rondelet's Flyingfish | Beloniformes | Marine | Cheilopogon rondeletii |
| Rondelet's deepwater stargazer | Perciformes | Marine | Kathetostoma canina |
| Rondelet's flyingfish | Beloniformes | Marine | Cheilopogon rondeletii |
| Rondella | Perciformes | Marine | Caranx hippos |
| Roodlefish | Tetraodontiformes | Marine | Lagocephalus sceleratus |
| Rookery fish | Perciformes | Marine (likely refers to Chromis species in rookeries) | Chromis |
| Rooster Flounder | Pleuronectiformes | Marine | Bothus mancus |
| Rooster Wrasse | Labriformes | Marine | Oxycheilinus unifasciatus |
| Rooster hind | Perciformes | Marine | Epinephelus fasciatus |
| Rooster hogfish | Perciformes | Marine | Bodianus eclancheri |
| Roosterfish | Perciformes | Coastal marine | Nematistius pectoralis |
| Ropefish | Polypteriformes | Freshwater swamps and rivers | Erpetoichthys calabaricus |
| Roper's seahorse | Syngnathiformes | Tropical marine waters | Hippocampus ropery |
| Roper's wrasse | Perciformes | Marine | Cheilinus roresii |
| Rosa blenny | Blenniiformes | Marine | Ecsenius rosae |
| Rosacea | Squaliformes | Marine (likely refers to a dogfish shark) | Centroscyllium ritteri |
| Rosada | Ophidiiformes | Marine | Genypterus blacodes |
| Rose Blenny | Blenniiformes | Marine | Meiacanthus mossambicus |
| Rose Cichlid | Cichliformes | Freshwater | Thorichthys meeki |
| Rose Eel | Anguilliformes | Freshwater | Moringua raitaborua |
| Rose Goby | Gobiiformes | Marine | Gobiodon spilophthalmus |
| Rose Skulpin | Scorpaeniformes | Marine | Scorpaena rosacea |
| Rose Spotted Blenny | Blenniiformes | Marine | Omobranchus roseus |
| Rose Velvetfish | Scorpaeniformes | Marine | Parascorpaena mcadami |
| Rose bass | Lophiiformes | Marine | Lophius americanus |
| Rose bitterling | Cypriniformes | Freshwater | Rhodeus ocellatus |
| Rose blenny | Blenniiformes | Marine | Parablennius gattorugin |
| Rose bream | Spariformes | Marine | Pagrus auratus |
| Rose perch | Scorpaeniformes | Marine | Helicolenus dactylopterus |
| Rose wrasse | Perciformes | Marine | Halichoeres marginatus |
| Rose-banded blenny | Perciformes | Marine | Parablennius incognitus |
| Rose-breasted wrasse | Perciformes | Marine | Thalassoma hardwicke |
| Rose-colored wrasse | Perciformes | Marine | Thalassoma bifasciatum |
| Rose-margined wrasse | Perciformes | Marine | Cirrhilabrus exquisitus |
| Rose-red Bass | Perciformes | Marine | Cephalopholis sonnerati |
| Rose-striped Blenny | Blenniiformes | Marine | Meiacanthus kamoharai |
| Roseate fish | Lophiiformes | Marine | Lophius budegassa |
| Roseate tern | Charadriiformes | Coastal and marine | Sterna dougallii |
| Rosefin blenny | Perciformes | Marine | Entomacrodus roseoflabrum |
| Roseland Goby | Gobiiformes | Marine | Cryptocentrus roseus |
| Roseleaf scorpionfish | Scorpaeniformes | Marine | Rhinopias aphanes |
| Roseless goby | Gobiiformes | Marine | Gobiodon rosaceus |
| Roselight fish | Stomiiformes | Marine | Maurolicus muelleri |
| Roselius' dartfish | Perciformes | Marine | Nemateleotris roseliusi |
| Rosen's pipefish | Syngnathiformes | Marine | Corythoichthys roseni |
| Rosen's tetra | Characiformes | Freshwater | Hyphessobrycon rosaceus |
| Rosenberg's Cardinalfish | Kurtiformes | Marine | Apogon margaritophorus |
| Rosenberg's Goby | Gobiiformes | Marine | Amblyeleotris steinitzi |
| Rosenblatt's Tilefish | Perciformes | Marine | Malacanthus rosenbergii |
| Rosetail pipefish | Syngnathiformes | Marine | Dunckerocampus chapmani |
| Rosette skate | Rajiformes | Marine | Leucoraja garmani |
| Rosetted moray | Anguilliformes | Marine | Gymnothorax mucifer |
| Rosomak | Salmo trutta | Scandinavia | Freshwater |
| Rosulate Goby | Gobiiformes | Marine | Gobiodon spilophthalmus |
| Rosy Blenny | Blenniiformes | Marine | Ecsenius oculus |
| Rosy Cardinalfish | Kurtiformes | Marine | Apogon dewa |
| Rosy barb | Cypriniformes | Freshwater streams | Pethia conchonius |
| Rosy bass | Perciformes | Marine | Acanthistius cinctus |
| Rosy basslet | Perciformes | Marine | Liopropoma rubre |
| Rosy bitterling | Cypriniformes | Freshwater streams | Rhodeus ocellatus |
| Rosy blenny | Blenniiformes | Marine | Ecsenius rubripinnis |
| Rosy cardinalfish | Kurtiformes | Marine | Apogonichthys rubrananus |
| Rosy darter | Perciformes | Freshwater | Etheostoma rubrum |
| Rosy dartfish | Perciformes | Marine | Ptereleotris rubristigma |
| Rosy doris | Perciformes | Marine | Anthias squamipinnis |
| Rosy dory | Zeiformes | Marine | Zenopsis conchifer |
| Rosy dottyback | Perciformes | Marine | Pseudochromis fuscus |
| Rosy drum | Perciformes | Marine | Umbrina ronchus |
| Rosy filefish | Tetraodontiformes | Marine | Cantherhines fronticinctus |
| Rosy flagtail | Perciformes | Marine | Kuhlia rubra |
| Rosy flathead | Scorpaeniformes | Marine | Rogadius pristiger |
| Rosy grouper | Perciformes | Marine | Epinephelus rosaceus |
| Rosy hawkfish | Perciformes | Marine | Cirrhitichthys rubripinnis |
| Rosy jack | Perciformes | Marine | Caranx ruber |
| Rosy jewfish | Perciformes | Marine | Protonibea diacanthus |
| Rosy perch | Perciformes | Marine | Helicolenus dactylopterus |
| Rosy pipefish | Syngnathiformes | Marine | Syngnathus rostellatus |
| Rosy platy | Cyprinodontiformes | Freshwater | Xiphophorus maculatus |
| Rosy razorfish | Perciformes | Marine | Xyrichtys martinicensis |
| Rosy red minnow | Cypriniformes | Freshwater | Pimephales promelas |
| Rosy reef bass | Perciformes | Coral reefs | Pseudanthias smithvanizi |
| Rosy sculpin | Scorpaeniformes | Marine | Sebastolobus alascanus |
| Rosy sea bass | Perciformes | Marine | Centropristis striata |
| Rosy seabass | Perciformes | Marine | Acanthistius cinctus |
| Rosy snapper | Perciformes | Marine | Lutjanus campechanus |
| Rosy soldierfish | Beryciformes | Marine | Myripristis murdjan |
| Rosy spectacle bass | Perciformes | Marine | Liopropoma rosaceum |
| Rosy stingray | Myliobatiformes | Marine | Urolophus armatus |
| Rosy stonefish | Scorpaeniformes | Marine | Synanceia horrida |
| Rosy surgeonfish | Perciformes | Marine | Acanthurus rubriolus |
| Rosy threadfin bream | Perciformes | Sandy bottoms | Nemipterus isacanthus |
| Rosy wrasse | Perciformes | Marine | Halichoeres maculipinna |
| Rosy-lipped batfish | Lophiiformes | Marine | Ogcocephalus darwini |
| Rosycheek Goby | Gobiiformes | Marine | Amblygobius nocturnus |
| Rotcod blenny | Blenniiformes | Marine | Hypleurochilus springeri |
| Rotenon fish | Perciformes | Marine (Likely a misidentification or very rare) | Rotenonichthys |
| Rough Filefish | Tetraodontiformes | Marine | Pseudomonacanthus peroni |
| Rough Puffer | Tetraodontiformes | Marine | Lagocephalus sceleratus |
| Rough Scad | Carangiformes | Marine | Trachurus lathami |
| Rough Triggerfish | Tetraodontiformes | Marine | Canthidermis maculata |
| Rough barracuda | Perciformes | Marine | Sphyraena tessera |
| Rough bass | Perciformes | Freshwater | Micropterus coosae |
| Rough blenny | Blenniiformes | Marine | Parablennius tentacularis |
| Rough drum | Sciaeniformes | Marine | Umbrina ronchus |
| Rough leatherjacket | Tetraodontiformes | Marine | Scobinichthys granulatus |
| Rough perch | Perciformes | Freshwater | Perca fluviatilis |
| Rough pipefish | Syngnathiformes | Marine | Syngnathus typhle |
| Rough scad | Perciformes | Coastal marine | Trachurus trecae |
| Rough scorpionfish | Scorpaeniformes | Marine | Scorpaena scrofa |
| Rough shark | Squaliformes | Deep marine | Oxynotus centrina |
| Rough silverside | Atheriniformes | Coastal marine | Kogia breviceps |
| Rough skin | Pleuronectiformes | Marine | Pleuronectes aspera |
| Rough tooth triggerfish | Tetraodontiformes | Marine | Canthidermis maculata |
| Rough triggerfish | Tetraodontiformes | Marine | Canthidermis maculata |
| Rough-back stingray | Myliobatiformes | Marine | Dasyatis hypostigma |
| Rough-head Blenny | Blenniiformes | Marine | Chasmodes bosquianus |
| Rough-head blenny | Blenniiformes | Marine | Acanthemblemaria hancocki |
| Rough-scaled toadfish | Batrachoidiformes | Marine | Opsanus pardus |
| Rough-snouted Flounder | Pleuronectiformes | Marine | Embassichthys bathybius |
| Rough-tail stingray | Myliobatiformes | Marine | Dasyatis centroura |
| Roughback batfish | Lophiiformes | Deep sandy bottoms | Zalieutes elater |
| Roughbass | Perciformes | Marine | Acanthistius cinctus |
| Roughfin Sole | Pleuronectiformes | Marine | Hippoglossoides elassodon |
| Roughhead blenny | Blenniiformes | Rocky reefs | Labrisomus gobio |
| Roughjaw Frogfish | Lophiiformes | Marine | Antennarius scaber |
| Roughneck Grouper | Perciformes | Marine | Epinephelus gabriellae |
| Roughneck grunt | Perciformes | Marine | Pomadasys bennettii |
| Roughnose dogfish | Squaliformes | Deep marine | Deania calcea |
| Roughridge Dogfish | Squaliformes | Marine | Oxynotus paradoxus |
| Roughscale flathead | Scorpaeniformes | Sandy bottoms | Thysanophrys chiltonae |
| Roughscale sole | Pleuronectiformes | Deep sandy bottoms | Clidoderma asperrimum |
| Roughskin dogfish | Squaliformes | Deep marine | Centroscymnus owstoni |
| Roughsnout grenadier | Gadiformes | Marine | Trachyrincus murrayi |
| Roughy | Stephanoberyciformes | Deep marine | Hoplostethus atlanticus |
| Round Head Seahorse | Syngnathiformes | Marine | Hippocampus bargibanti |
| Round barracuda | Perciformes | Marine | Sphyraena obtusata |
| Round betta | Ovalentaria | Freshwater | Betta imbellis |
| Round croaker | Perciformes | Marine | Umbrina coroides |
| Round dolphin | Perciformes | Marine (Mahi-Mahi) | Coryphaena hippurus |
| Round drum | Perciformes | Marine | Umbrina coroides |
| Round flounder | Pleuronectiformes | Marine | Bothus podas |
| Round goby | Perciformes | Freshwater/Marine | Neogobius melanostomus |
| Round herring | Clupeiformes | Marine | Etrumeus teres |
| Round lizardfish | Aulopiformes | Marine | Saurida globosa |
| Round pompano | Perciformes | Marine | Trachinotus falcatus |
| Round ray | Myliobatiformes | Marine | Taeniura grabata |
| Round robin | Perciformes | Marine | Megalops cyprinoides |
| Round rockfish | Scorpaeniformes | Marine | Sebastes nebulosus |
| Round sardinella | Clupeiformes | Marine | Sardinella aurita |
| Round scad | Carangiformes | Marine | Decapterus punctatus |
| Round scorpionfish | Scorpaeniformes | Marine | Scorpaena rascassoides |
| Round seahorse | Syngnathiformes | Marine | Hippocampus kuda |
| Round skate | Rajiformes | Marine | Raja eglanteria |
| Round stingray | Myliobatiformes | Marine | Urobatis halleri |
| Round whitefish | Salmoniformes | Freshwater | Prosopium cylindraceum |
| Rounded lizardfish | Aulopiformes | Marine | Synodus fuscomaculatus |
| Rounded triggerfish | Tetraodontiformes | Marine | Canthidermis maculata |
| Roundhead | Perciformes | Marine | Cephalopholis sonnerati |
| Roundhead Catfish | Siluriformes | Freshwater | Otocinclus cocama |
| Roundhead Parrotfish | Labriformes | Marine | Chlorurus strongylocephalus |
| Roundnose Flounder | Pleuronectiformes | Marine | Glyptocephalus cynoglossus |
| Roussel's Goby | Gobiiformes | Freshwater | Glossogobius rousseli |
| Rover | Perciformes | Marine | Labracoglossa argenteiventris |
| Roving coral grouper | Perciformes | Marine | Plectropomus pessuliferus |
| Roving coralgrouper | Perciformes | Coral reefs | Plectropomus pessuliferus |
| Royal Angelfish | Perciformes | Marine | Pygoplites diacanthus |
| Royal Basslet | Perciformes | Marine | Gramma loreto |
| Royal Blenny | Blenniiformes | Marine | Ecsenius midas |
| Royal Cardinalfish | Kurtiformes | Marine | Apogon perlitus |
| Royal Dottyback | Perciformes | Marine | Gramma loreto |
| Royal Filefish | Tetraodontiformes | Marine | Aluterus schoepfii |
| Royal Gamma | Perciformes | Marine | Gramma loreto |
| Royal Gourami | Anabantiformes | Freshwater | Osphronemus laticlavia |
| Royal Gramma | Perciformes | Marine | Gramma loreto |
| Royal Slender Mudskipper | Gobiiformes | Brackish | Periophthalmus novemradiatus |
| Royal Tang | Acanthuriformes | Marine | Paracanthurus hepatus |
| Royal angelfish | Perciformes | Coral reefs | Pygoplites diacanthus |
| Royal basslet | Perciformes | Coral reefs | Gramma loreto |
| Royal dottyback | Perciformes | Coral reefs | Pseudochromis paccagnellae |
| Royal gramma | Perciformes | Coral reefs | Gramma loreto |
| Royal pleco | Siluriformes | Freshwater | Panaque nigrolineatus |
| Royal wrasse | Perciformes | Marine | Paracheilinus cyaneus |
| Rubberlip grunt | Perciformes | Marine | Plectorhinchus multilineatus |
| Rubberman Wrasse | Labriformes | Marine | Cirrhilabrus rubrisquamis |
| Rubbernose pupfish | Cyprinodontiformes | Freshwater | Cyprinodon rubrofluviatilis |
| Rubin's Blenny | Blenniiformes | Marine | Ecsenius rubinus |
| Ruby Blenny | Blenniiformes | Marine | Ecsenius rubidus |
| Ruby Cardinalfish | Kurtiformes | Marine | Zoramia rubrisquamis |
| Ruby Red Dragonet | Syngnathiformes | Marine | Synchiropus sycorax |
| Ruby red dragonet | Callionymiformes | Marine | Synchiropus sycorax |
| Ruby snapper | Perciformes | Deep reefs | Etelis carbunculus |
| Ruby wrasse | Perciformes | Marine | Thalassoma rubrovincinctum |
| Rudalle's stargazer | Uranoscopiformes | Marine | Uranoscopus bicinctus |
| Rudd | Cypriniformes | Freshwater | Scardinius erythrophthalmus |
| Rudderfish | Perciformes | Marine | Kyphosus bigibbus |
| Ruddfish | Cypriniformes | Freshwater | Scardinius erythrophthalmus |
| Rueppell's dottyback | Perciformes | Marine | Pseudochromis rueppellii |
| Ruffe | Perciformes | Freshwater | Gymnocephalus cernua |
| Rufous Blenny | Blenniiformes | Marine | Omobranchus rutilus |
| Rufous fantail | Perciformes | Marine | Rhipidura rufifrons |
| Rufous rockcod | Perciformes | Marine | Epinephelus rufus |
| Rufous sea bass | Perciformes | Marine | Hypoplectrus unicolor |
| Rugose moray | Anguilliformes | Marine | Gymnothorax rugosus |
| Rummy nose tetra | Characiformes | Freshwater | Hemigrammus rhodostomus |
| Rummy-nose tetra | Characiformes | Freshwater | Hemigrammus rhodostomus |
| Rummynose tetra | Characiformes | Freshwater rivers | Hemigrammus rhodostomus |
| Runabout Goby | Gobiiformes | Marine | Gobiopsis macrostoma |
| Runner | Carangiformes | Marine | Elagatis bipinnulata |
| Runner Blenny | Blenniiformes | Marine | Ecsenius lividanalis |
| Rupes | Perciformes | Coral reefs | Acanthurus rupes |
| Rupiah moray | Anguilliformes | Marine | Gymnothorax rupiah |
| Rush lamprey | Petromyzontiformes | Freshwater streams | Lampetra richardsoni |
| Russetfin rockfish | Scorpaeniformes | Marine | Sebastes proriger |
| Russia wrasse | Perciformes | Marine | Halichoeres rubricephalus |
| Russian sturgeon | Acipenseriformes | Freshwater rivers and coastal marine | Acipenser gueldenstaedtii |
| Rusty Blenny | Blenniiformes | Marine | Ecsenius ops |
| Rusty Hogfish | Labriformes | Marine | Bodianus unimaculatus |
| Rusty Parrotfish | Labriformes | Marine | Scarus ferrugineus |
| Rusty Seabream | Spariformes | Marine | Boops boops |
| Rusty blenny | Blenniiformes | Rocky shores | Parablennius sanguinolentus |
| Rusty cardinalfish | Perciformes | Marine | Apogon evermanni |
| Rusty dab | Pleuronectiformes | Sandy bottoms | Limanda ferruginea |
| Rusty flounder | Pleuronectiformes | Marine | Pleuronectes ferruginea |
| Rusty goby | Gobiiformes | Marine | Gobius niger |
| Rusty parrotfish | Perciformes | Marine | Sparisoma rubripinne |
| Rusty pipefish | Syngnathiformes | Seagrass beds | Syngnathus floridae |
| Rusty sorcerer | Scorpaeniformes | Rocky reefs | Scorpaena rascacio |
| Rusty triggerfish | Tetraodontiformes | Marine | Sufflamen bursa |
| Rye fish | Perciformes | Marine | Arctoscopus japonicus |
| Rylstone goby | Gobiiformes | Estuarine | Tasmanogobius globiceps |