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Nile minnow

Leptocypris niloticus

Not Evaluated freshwater

Nise-soko-shiro

Liparis burkei

Not Evaluated saltwater

Nimbapanchax melanopterygius

Not Evaluated freshwater

Niobichthys ferrarisi

Not Evaluated freshwater

Niwaella xinjiangensis

Not Evaluated freshwater

Nomorhamphus bakeri

Not Evaluated freshwater

Nomorhamphus kolonodalensis

Not Evaluated freshwater

Nirami-amadai

Opistognathus iyonis

Not Evaluated saltwater

Nise-borokasago

Rhinopias xenops

Not Evaluated saltwater

Nippon Baratanago

Rhodeus smithii

Not Evaluated freshwater

Nishikibera

Thalassoma cupido

Not Evaluated saltwater

Northern four-eye

Anableps dowii

Not Evaluated both

Northern sole

Limanda aspera

Not Evaluated saltwater

Northern purplespotted gudgeon

Mogurnda mogurnda

Not Evaluated freshwater

Northwest dace

Mylocheilus caurinus

Not Evaluated brackish

Northern madtom

Noturus stigmosus

Not Evaluated freshwater

Northern whitefin gudgeon

Romanogobio belingi

Not Evaluated freshwater

North Pacific squirrelfish

Sargocentron spinosissimum

Not Evaluated saltwater

Northern lampfish

Stenobrachius leucopsarus

Not Evaluated saltwater

North Pacific lanternfish

Tarletonbeania taylori

Not Evaluated saltwater

Acará

Cichlasoma dimerus

Not Evaluated freshwater

Norway bullhead

Micrenophrys lilljeborgii

Not Evaluated saltwater

Notacanthus arrontei

Not Evaluated saltwater

Notacanthus indicus

Not Evaluated saltwater

Notarius armbrusteri

Not Evaluated saltwater

Nuakata shrimpgoby

Tomiyamichthys stuarti

Not Evaluated saltwater

Numa-chichibu

Tridentiger brevispinis

Not Evaluated both

Obliquebanded stingfish

Minous dempsterae

Not Evaluated saltwater

Obscure goby

Mugilogobius fusculus

Not Evaluated brackish

Nybelinella brevidorsalis

Not Evaluated saltwater

Obliquogobius cometes

Not Evaluated saltwater

Obliquogobius fulvostriatus

Not Evaluated saltwater

Obliquogobius yamadai

Not Evaluated saltwater

Oblong slipmouth

Photolateralis stercorarius

Not Evaluated saltwater

Obscure pipefish

Phoxocampus diacanthus

Not Evaluated saltwater

Nutting's hatchet fish

Polyipnus nuttingi

Not Evaluated saltwater