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Santa Cruz whiptail catfish

Rineloricaria strigilata

Not Evaluated freshwater

Catfish

Rineloricaria thrissoceps

Not Evaluated freshwater

Rineloricaria zaina

Not Evaluated freshwater

Rita macracanthus

Not Evaluated freshwater

Brown rivulus

Rivulus cylindraceus

Not Evaluated freshwater

Rivulus formosensis

Not Evaluated freshwater

Rivulus pivijay

Not Evaluated freshwater

Triple-banded butterflyfish

Roa australis

Not Evaluated saltwater

Deep-blackfin butterflyfish

Roa rumsfeldi

Not Evaluated saltwater

Half-moon barred butterflyfish

Roa semilunaris

Not Evaluated saltwater

Roeboides oligistos

Not Evaluated freshwater

Roestes itupiranga

Not Evaluated freshwater

Flathead

Rogadius asper

Not Evaluated saltwater

Serrate flathead

Rogadius serratus

Not Evaluated saltwater

Danube delta gudgeon

Romanogobio antipai

Not Evaluated freshwater

Greek stone gudgeon

Romanogobio elimeius

Not Evaluated freshwater

South caucasian gudgeon

Romanogobio macropterus

Not Evaluated freshwater

Kura gudgeon

Romanogobio persus

Not Evaluated freshwater

Don whitefin gudgeon

Romanogobio tanaiticus

Not Evaluated freshwater

Amur white gudgeon

Romanogobio tenuicorpus

Not Evaluated freshwater

赫恩氏宝丽鱼

Rondonacara hoehnei

Not Evaluated freshwater

Ocellate skate

Rostroraja ackleyi

Not Evaluated saltwater

Ecuatorial ray

Rostroraja equatorialis

Not Evaluated saltwater

大眼路岛峡塘鳢

Rotuma lewisi

Not Evaluated saltwater

Sekitori-iwashi

Rouleina watasei

Not Evaluated saltwater

Rubicundus lopheliae

Not Evaluated saltwater

Leatherjacket

Rudarius minutus

Not Evaluated saltwater

Roughcheek sculpin

Ruscarius creaseri

Not Evaluated saltwater

Caspian roach

Rutilus caspicus

Not Evaluated brackish

Rutilus stoumboudae

Not Evaluated freshwater

Castor oil fish

Ruvettus pretiosus

Not Evaluated saltwater

Largespotted soapfish

Rypticus bornoi

Not Evaluated saltwater

Sabanejewia baltica

Not Evaluated freshwater

Gold-Steinbeißer

Sabanejewia bulgarica

Not Evaluated freshwater

Caucasian spiny loach

Sabanejewia caucasica

Not Evaluated freshwater

Italian golden loach

Sabanejewia larvata

Not Evaluated freshwater