electric eel

hagfish (jawless proto-fish of class Myxini)

variant of 鱸鰻|鲈鳗[lu2 man2], giant mottled eel (Anguilla marmorata)

(Tw) giant mottled eel (Anguilla marmorata), aka swamp eel or marbled eel; (coll.) (alternative for the nearly homonymous 流氓[liu2 mang2]) gangster

short-finned eel (Anguilla australis)

lamprey (jawless proto-fish of family Petromyzontidae)

lamprey (jawless proto-fish of family Petromyzontidae)