Dorsal and Caudal fins of the Ocean Sunfish Mola mola, #39407
Dorsal and Caudal fins of the Ocean Sunfish Mola mola, as it Swims in the Open Ocean, near San Diego. The caudal fin is not a true tail but is a tail-like structure called a clavus that serves as a rudder. The dorsal (top) and anal (bottom) fins are used for propulsion. California, USA