1, appearance characteristics: the body of the blue fish lateral compression, the back is dark blue or black, the abdomen is silver-white, with obvious black spots; horse mackerel body prolongation, the back of the blue-gray, the lateral line is obvious, the side of the body there is a gold or silver stripes; shark body slightly flat, the back of the blue-black, the side of the body there is a golden stripe of 5.

2, the distribution area: the blue jumbo fish is mainly distributed in the western Pacific Ocean and the Indian Ocean warm sea; mackerel is mainly distributed in the northern hemisphere in the temperate and subtropical waters; sharks are mainly distributed in the coastal areas of East Asia, such as Japan, China and South Korea and so on.

3, ecological habits: the blue jumbo is a kind of offshore demersal fish, belongs to the migratory schooling fish, to the plankton and small fish for food; the shark is a kind of cruising fish, usually in the offshore and coastal waters, to fish, crustaceans and mollusks for food.