Mackerel is the perch order mackerel family mackerel genus fish, also known as mackerel, oil carcass fish, blue mackerel, Japanese mackerel and so on. Body length up to about 64 centimeters, body shape similar to the spindle, the caudal fin into a deep forked. The dorsal side of the body is blue-black, with dark blue irregular markings, the abdomen is silver and white with a little yellow. The maximum life span is 11 years. The mackerel is widely distributed in the northwest Pacific coast, China, Japan and Korea and other waters are distributed. It is a warm-water pelagic fish. It has strong nocturnal phototropism, and has the phenomenon of vertical movement during the day and night. Wide diet, feeding on planktonic crustaceans and juvenile fish. Strong swimmer, capable of long-distance migration. It mostly inhabits the middle and upper layers in spring and summer, and forms large groups to spawn offshore during the reproductive season. The reproductive period is from March to June, the peak period is from April to May, and the eggs are spawned in batches. Eggs are round, floating, transparent, with oil balls.