ventral fin

American  

noun

1. pelvic fin.

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ventral fin British  

noun

1. another name for pelvic fin

2. any unpaired median fin situated on the undersurface of fishes and some other aquatic vertebrates

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Etymology

Origin of ventral fin

First recorded in 1745–55

Example Sentences

From September 10-14, Chinook must have an adipose or left ventral fin clip to be retained. 

From Seattle Times

Chinook retention on Sundays and Mondays will be limited to hatchery fish with an adipose or left ventral fin clip.

From Seattle Times

Chinook retention on Sundays and Mondays will be limited to hatchery fish with an adipose or left ventral fin clip only.

From Seattle Times

These steelhead can be identified by having both the adipose and right ventral fin clipped.

From Seattle Times

Effective August 30 through September 1, all Chinook must be adipose or left ventral fin clipped to be retained. 

From Seattle Times