adipose fin

American  

noun

1. a small, fleshy fin, usually lacking rays, behind the main dorsal fin in trouts, catfishes, and other bony fishes.

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adipose fin British  

noun

1. a posterior dorsal fin occurring in some fish, such as those of the salmon and catfish families

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Example Sentences

You can tell them by their intact adipose fin, on top of their bodies near their tail.

From Seattle Times • Aug. 18, 2023

When she ends up in the net, she reveals a nice, smooth back with a hard bump where her adipose fin had been.

From Washington Times • Jul. 16, 2016

New for 2012: Any Chinook and any coho may be retained, adipose fin clipped or not.

From Seattle Times • Jul. 29, 2012

Eleven pounds and no adipose fin — a hatchery salmon!

From New York Times • Oct. 22, 2011

It was rather like the adipose fin of a fish, but gaudy.

From "The Once and Future King" by T. H. White