Definition that contains pelvic fin
- catfish large ferocious northern deep-sea food fishes with strong teeth and no pelvic fins
- superclass agnatha superclass of eel-shaped chordates lacking jaws and pelvic fins: lampreys; hagfishes; some extinct forms
- biplane flying fish having both pectoral and pelvic fins enlarged
- blennioid elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins
- order apodes elongate fishes with pelvic fins and girdle absent or reduced
- snailfish small tadpole-shaped cold-water fishes with pelvic fins forming a sucker; related to lumpfish
- wolf fish large ferocious northern deep-sea food fishes with strong teeth and no pelvic fins
- blennioid fish elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins
- liparis liparis small tadpole-shaped cold-water fishes with pelvic fins forming a sucker; related to lumpfish
- sea snail small tadpole-shaped cold-water fishes with pelvic fins forming a sucker; related to lumpfish