Bonito (Katsuwonus pelamis) is a large pelagic fish widely distributed in the global tropical-subtropical waters, and belongs to one of the most economically valuable species of tuna. It is named for its dark stripes on the sides of the body ("skipjack" originally means "jumping mackerel") and active cluster habits. Bonito is a typical pelagic migratory fish with a streamlined spindle-shaped body and is adapted to high-speed swimming. The tropical-subtropical waters (40 ° N to 40 ° S) of the three global oceans (Pacific Ocean, Atlantic Ocean, and Indian Ocean) are concentrated on both sides of the equator.

Also known as tuna, it is a marine fish belonging to the order of bony fishes, order of tuna, and family of tuna. Known for its fast swimming and long-distance migration, it is an important predator in the ocean. The body is streamlined with well-developed muscles, capable of high-speed swimming in water and preying on small fish and crustaceans. The body size is usually large, and adult individuals can grow up to several meters long and weigh several hundred kilograms. Widely distributed in tropical and subtropical waters around the world, it is an important component of fisheries in many countries. It holds an important ecological position and also has extremely high economic value. The meat is delicious and rich in protein and unsaturated fatty acids.