pelvic fin; ventral fin
The pair of fins located on the underside of a fish, corresponding to the hindlimbs of land vertebrates.
The pelvic fins of a fish help maintain its balance.
In this field guide, species are identified by the position of the ventral fins.
Standard kanji spelling using 腹 (belly) and 鰭 (fin).
Common mixed spelling with 鰭 replaced by kana びれ for readability.
Compound of 腹 (はら, belly) and 鰭 (ひれ, fin). The reading はらびれ is a straightforward combination.