pelvic fin

(in fishes) either of a pair of fins on the lower surface of the body, corresponding to the hind limbs of a land vertebrate; ventral fin.

1905–10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pelvic fin
either of a pair of fins attached to the pelvic girdle of fishes that help to control the direction of movement during locomotion

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
There is a small triangular projection at the base of the pelvic fin.
Hatchery fish were distinguished from naturally produced fish by a pelvic fin
Usually a small flap of skin present at the base of each pelvic fin.
Scissors were used to collect a genetic sample from the left pelvic fin of all
  bull trout upon initial capture.
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