鰭 - fin

Wilson's phalarope (Phalaropus tricolor)

red-necked phalarope (Phalaropus lobatus)

red phalarope; grey phalarope (Phalaropus lobatus)

sailfin poacher (Podothecus sachi)

fin ray

sarcopterygians (fishes of subclass Sarcopterygii)

Actinopterygii (class of the ray-finned fishes)

making something strong even stronger; (giving) fins to a lion

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

dorsal fin

phalarope (any sandpiper of family Phalaropodidae)

pelvic fin; ventral fin