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

Hatchery fish have a clipped adipose fin, which is just above the tail fin.

From Washington Times

Federal officials are expected to decide on a plan to allow anglers to keep wild fish, which have the adipose fin, in early September.

From Seattle Times

The season is for hatchery fish only, meaning fish that have the adipose fin between the tail and dorsal fin clipped off.

From Seattle Times

But those that have been tagged can be identified because their adipose fin has been removed.

From Washington Times

This means hatchery-marked coho salmon with a missing adipose fin that are 12 inches or longer may be kept as part of a trout daily catch limit.

From Seattle Times