anal fin

American  

noun

1. the median, unpaired fin on the ventral margin between the anus and the caudal fin in fishes.

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anal fin British  

noun

1. a median ventral unpaired fin, situated between the anus and the tail fin in fishes, that helps to maintain stable equilibrium

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Example Sentences

See Examples For:

anal fin

Hook the head section of the mullet through both lips, and the tail portion just above the anal fin.

From Time Magazine Archive

For better distance, hook the bait through the anal fin and either let the bait settle at the bottom or flow in the current.

From Time Magazine Archive

I drew a dorsal fin on top and an anal fin on the bottom, to prevent the shark from rolling side to side when it was moving forward.

From "The Line Tender" by Kate Allen

The opal hues came out upon the anal fin, and the broad tail curled up, showing lavender tints on a background of brilliant blue.

From Tales of Fishes by Zane Grey

Only part of one basal plate of the anal fin was preserved on K. U. no.

From A New Genus of Pennsylvania Fish (Crossoperygii, Coelacanthiformes) from Kansas by Joan Echols