Question

Why do fishes have fins?

Answer 1

The key function of fins is to help the fish balance and turn as it swims.

Apart from the tail or caudal fin, fins have no direct connection with the spine and are supported by muscles only. Their principal function is to help the fish swim. Fins can also be used for gliding or crawling, as seen in the flying fish and frogfish. ... In bony fish, most fins may have spines or rays.