The caudal fin is a fin located on the tail of many aquatic animals: jawless animals, fish, some marine mammals (cetaceans and sirens), and some extinct marine reptiles. Its shape is closely related to the type of locomotion.

The types of caudal fins are distinguished as follows:

1) isobate (tuna, mackerel);

2) hypobatic (flying fish);

3) epibatic (sharks, sturgeons).

Isobate type of caudal fin - found in fish that have upper and lower lobes of equal length (carp, herring).