Refers to the fin of a fish or other aquatic animal. The reading はた is obsolete.
魚のひれが水の中で動いている。
The fish's fins are moving in the water.
魚の鰭
The fish's fin was visible above the water.
dorsal fin
sailfin poacher
pectoral fin
adipose fin
Usually written in kana; the kanji 鰭 is rare and may not be recognized by many readers.
Kanji form; rarely used in modern writing.
Native Japanese word. The historical derivation is uncertain.