It is one of the largest species of tuna. The body is short and sturdy, with a conical shape and crossed tail fins. The body length is generally 1-3 meters, and the weight can reach 200-400 kilograms, with the largest reaching over 3 meters and weighing more than 700 kilograms. The back is greenish black, the abdomen is silver white, the tail is raised with black ridges, and the whole body is covered with small round scales. It is a migratory fish species in the middle and upper layers of the ocean, which likes to form groups and swim fast. It mainly feeds on fish, cephalopods, and crustaceans. Distributed in temperate and tropical waters of the Atlantic, including the East China Sea. The meat is delicate, rich in oil, light red in color, and has an excellent taste, making it expensive.