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caudal fin

the terminal vertical fin of a fish.
Also called tail fin. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for caudal fin
  • 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.
  • Orbital bars are present, as is a distinct bar or spot at the base of the caudal fin.
  • Two prominent features of the swamp darter are a bar under the eye and one distinct spot at the base of the caudal fin.
  • The dorsal fin is long, extending from the pectoral fins almost to the base of the convex caudal fin.
  • The caudal fin is slightly notched, and the top of the upper lobe is white on all but extremely large individuals.
  • The trailing edge of the caudal fin is rounded or almost triangular.
  • The caudal fin is square and there is a pronounced adipose fin.
British Dictionary definitions for caudal fin

caudal fin

the tail fin of fishes and some other aquatic vertebrates, used for propulsion during locomotion
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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