Tuna, also known as mackerel (scientific name), bony fish, Perciformes, Sparidae. There are many kinds of mackerel, such as mackerel, spotted mackerel and Kangshi mackerel. The common names of mackerel are swallow fish, mackerel, bamboo pod fish, pointed mackerel, green arrow fish and so on. Sharp teeth, agile swimming, fierce temperament, generally 0.26-0.52m long, the longest up to 1m, weighing 20kg. Distributed in the western part of the North Pacific Ocean, found in Bohai Sea, Yellow Sea and East China Sea. It belongs to warm pelagic fish. It feeds on small pelagic fish, migrates in groups in summer and autumn, and some of them enter the Bohai Sea to lay eggs. In autumn, they often forage in groups near coastal islands and reefs.

Fish [bà] has a flat side, bright silver body, dark stripes or black-blue spots on its back, a big mouth, sharp teeth, fast swimming and fierce temperament. The specimen of "Bayu King" in Dalian Natural Museum weighs more than 260 kilograms, 2.64 meters and is in his twenties.

At present, the main fishing grounds of Spanish mackerel are in Zhoushan, Lianyungang and the southern coast of Shandong. Spring is April-June, autumn is 7- 10, and the fishing season is May-June. Fishing methods include drift net, belt wheel trawl and hook fishing. In the 1950s and 1960s when resources were abundant, May-June was a good season to catch Spanish mackerel in Bohai Bay. The sun touched the mountain, the net floated, and the awn stretched for more than ten miles. From the next morning, there are often three or four thousand fish weighing three or four kilograms. Spanish mackerel is fierce by nature, and often swims to the shallow water on the shore to catch food from June to mid-October every year. Its streamlined shape, extremely high swimming speed and sharp teeth are like cheetahs chasing prey. Frightened small fish flee everywhere and often rush to the shore reef to "get up", which surprises the spectacular sight of Spanish mackerel flying to catch food. During this duty time, anglers enjoy throwing Spanish mackerel on rocks and sides, hoping to take the bait. Spanish mackerel is a great pleasure for anglers because of its large size, fast eating and exciting fishing feeling.