They include dorsal, anal, and caudal fins. The dorsal fin grows along the back and helps a fish keep upright. Almost all fish have at least one dorsal fin, and many have two or three. The anal fin grows on the underside near the tail. Like a dorsal fin, it helps a fish remain upright.
Some fish have two anal fins.
The caudal fin is at the end of the tail. A fish swing its caudal fin from side to side to propel through the water and to help in steering. Paired fins are two identical fins, one on each side of the body. Most fish have both pectoral and pelvic paired fins. Paired fins are used mainly to turn, stop, and make other manoeuvres.