Bonito can be distinguished from other tunas by the presence of seven or more (often 9-12) oblique dark stripes on the dorsal side of the fish. The back of the fish is steel-blue or blue-green and the flanks and belly are silvery to whitish. The body is entirely covered with scales, which are very small except in the pectoral region. Bonito have large conical teeth on both the upper and lower jaw. No swimbladder is present, and there are 16-24 gill rakers on the first gill arch. The pectoral fins are very short, and there are 20-23 fin rays on the 1st dorsal fin. The right and left lobes of the liver are elongate, while the center lobe is short. Common size: 25 inches.