pelvic fin

noun
(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.

Origin:
1905–10

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World English Dictionary
pelvic fin
 
n
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
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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
  clips.
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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