鰭 - fin

adipose fin

sarcopterygians (fishes of subclass Sarcopterygii)

Actinopterygii (class of the ray-finned fishes)

shark fin

shark fin soup

shark fin

long-finned pilot whale (Globicephala melas)

white cloud mountain minnow (Tanichthys albonubes); Canton danio

pinnipeds (seals and walruses)

caudal fin; tail fin

sailfin poacher (Podothecus sachi)

short-finned pilot whale (Globicephala macrorhyncus)