鰭 - fin

pinnipeds (seals and walruses)

fin (e.g. of a fish)

caudal fin; tail fin

sailfin poacher (Podothecus sachi)

fin ray

adipose fin

mid-sized konoshiro gizzard shad (i.e. about 15 cm in size)

shark fin

bones supporting the fins of a fish

sarcopterygians (fishes of subclass Sarcopterygii)

Actinopterygii (class of the ray-finned fishes)

short-finned pilot whale (Globicephala macrorhyncus)