caudal fin

noun
the terminal vertical fin of a fish.
Also called tail fin.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
caudal fin
 
n
the tail fin of fishes and some other aquatic vertebrates, used for propulsion during locomotion

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The caudal fin is deeply emarginate and the belly lacks a keel.
The caudal fin margin is essentially straight or slightly notched.
The caudal fin is often completely destroyed and the fish may become dark
  colored.
Two distinct light brown spots surrounded by yellow are found at the base of
  the caudal fin.
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