The Digital Fish Library

During Carangiform locomotion, only the posterior part of the fish is flexed and side to side undulations are confined to the last 1/3 of the length of the body. The caudal fin is stiff and deeply forked with elongated upper and lower lobes, reducing water turbulence and drag. To minimize yaw, these fish are relatively laterally compressed and deeper bodied, with stiffened unpaired fins, and narrow caudal peduncles.