Shark fins used in the soup are the cartilaginous dorsal, pectoral and caudal fins. It lacks ventral fins but pectoral fins are present. Pectoral and pelvic fins have articulations resembling those of tetrapod limbs. It moves by combining pectoral, dorsal, anal, and caudal fins. It is innervated by the caudal pectoral nerves. They used paired pectoral and pelvic fins for locomotion. Its pectoral and pelvic fins are nearly adjacent. The plastron features paired gular, humeral, pectoral, abdominal, femoral, and anal scutes. The pectoral fins are short and rounded. Most species lack pectoral and pelvic fins, adding to their serpentine appearance. The pectoral and pelvic girdles are notably distinct. The pectoral and pelvic fins may vary from red to orange. The pelvic fins are large, angular, and set forward of the pectoral fins. Blue sharks are light-bodied with long pectoral fins. These fishes move by using sweeping movements of their large pectoral fins.