homocercal fin

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Definitions from WordNet

Noun homocercal fin has 1 sense

homocercal fin - symmetrical tail fin extending beyond the end of the vertebral column as in most bony fishes
--₁ is a kind of tail fin, caudal fin
Antonyms: heterocercal fin

Definitions from the Web

Homocercal Fin

Definition: A homocercal fin is a type of tail fin found in certain fishes, in which the upper and lower lobes are symmetrical, resulting in a vertical median plane.

Examples:

The homocercal fin allows the fish to swim efficiently and maintain stability in the water.
Sharks and bony fishes such as perch and salmon have homocercal fins.
The symmetrical shape of the homocercal fin helps the fish change direction quickly.