pectoral fin

noun
(in fishes) either of a pair of fins usually situated behind the head, one on each side, and corresponding to the forelimbs of higher vertebrates.

Origin:
1760–70

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World English Dictionary
pectoral fin
 
n
either of a pair of fins, situated just behind the head in fishes, that help to control the direction of movement during locomotion

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
We are also currently investigating underestimation of fish aging using
  pectoral fin-rays.
The pectoral fin is short and does not reach the nostril when bent forward
  beside the head.
The short, rounded pectoral fin does not reach the nostril when bent forward
  along the head.
Fish attributes were recorded and a pectoral fin ray was removed for aging.
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