What is the correct name of the fin used for propulsion in fish?

The caudal fin is the primary fin responsible for propulsion in fish. Located at the rear end of the fish, this fin is shaped to provide thrust as the fish swims through the water. When a fish moves its tail (the caudal fin) side to side, it creates a forward motion. This movement is crucial for swimming, allowing the fish to accelerate, decelerate, and change direction effectively.

The other fins, while important for various functions, do not play a primary role in propulsion. The dorsal fin helps maintain stability while swimming, the pelvic fins aid in balance and steering, and the pectoral fins are involved in maneuvering and can assist in braking. However, none of these fins provide the driving force that the caudal fin does. Understanding the function of each fin is key to recognizing the essential role of the caudal fin in a fish's locomotion.