either of a pair of fins attached to the pelvic girdle in fishes that help control the direction of movement; correspond to hind limbs of a land vertebrate 同义词：ventral fin,
例句与用法
1.
Details of the discovery are published today in the journal proceedings of the royal society of london , series b . the male fish grow to 8 . 6mm , and boast enlarged pelvic fins with exceptionally large muscles relative to the size of the rest of their bodies 布利兹指出： “这种曾经遍及东南亚的泥煤沼泽地如今已经消失了许多，而生活在其中的动物也在濒临灭绝。 ”布利兹等人的最新发现被刊登在了最新一期的英国伦敦皇家学会会报， b辑上。
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