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黃尾鮰

Xenocypris davidi

Not Evaluated brackish

Tsubu-iwashi

Xenodermichthys nodulosus

Not Evaluated saltwater

Deepwater conger

Xenomystax atrarius

Not Evaluated saltwater

Shadow toothcarp

Xenophallus umbratilis

Not Evaluated freshwater

Platanna klipfish

Xenopoclinus kochi

Not Evaluated saltwater

Xenotilapia albini

Not Evaluated freshwater

尾紋奇非鯽

Xenotilapia caudafasciata

Not Evaluated freshwater

黑唇奇非鯽

Xenotilapia nigrolabiata

Not Evaluated freshwater

Xenurolebias pataxo

Not Evaluated freshwater

Spiketail platyfish

Xiphophorus andersi

Not Evaluated freshwater

Puebla platyfish

Xiphophorus evelynae

Not Evaluated freshwater

Highland swordtail

Xiphophorus malinche

Not Evaluated freshwater

Mixe swordtail

Xiphophorus mixei

Not Evaluated freshwater

Mexican swordtail

Xiphophorus montezumae

Not Evaluated freshwater

Komma-Schwertträger

Xiphophorus signum

Not Evaluated freshwater

Xiurenbagrus gigas

Not Evaluated freshwater

Carachita

Xyliphius lepturus

Not Evaluated freshwater

喜泳鯰

Xyliphius magdalenae

Not Evaluated freshwater

Marmalade Razorfish

Xyrichtys blanchardi

Not Evaluated saltwater

爪哇连鳍唇鱼

Xyrichtys javanicus

Not Evaluated saltwater

Hage-yoko-eso

Yarrella blackfordi

Not Evaluated saltwater

尾斑沙鰍

Yasuhikotakia caudipunctata

Not Evaluated freshwater

Orangefin loach

Yasuhikotakia modesta

Not Evaluated freshwater

閃光沙鰍

Yasuhikotakia splendida

Not Evaluated freshwater

Yirrkala kaupii

Not Evaluated brackish

Misol snake eel

Yirrkala misolensis

Not Evaluated saltwater

Oman snake eel

Yirrkala omanensis

Not Evaluated saltwater

Yirrkala ori

Not Evaluated saltwater

汤氏裸颊鰕虎鱼

Yongeichthys thomasi

Not Evaluated both

印度裸頰鰕虎魚

Yongeichthys tuticorinensis

Not Evaluated freshwater

北盘江云南鳅

Yunnanilus beipanjiangensis

Not Evaluated freshwater

Yunnanilus longibarbatus

Not Evaluated freshwater

宽头云南鳅

Yunnanilus pachycephalus

Not Evaluated freshwater

四川云南鳅

Yunnanilus sichuanensis

Not Evaluated freshwater

Yunnanilus spanisbripes

Not Evaluated freshwater

Zacco acutipinnis

Not Evaluated freshwater