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Chub mackerel is thick and slightly flat, in spindle shape. The body is covered with small round scales, the back of the body is cyan black or dark blue, and the pectoral fins on both sides of the body

There are irregular dark blue insect etchings above the horizontal line. The abdomen is white and slightly yellow. Mackerel is a kind of food with high protein, low fat and easy to be absorbed by human body; Mackerel also contains eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). EPA can dilate blood vessels and prevent blood coagulation; DHA plays an extremely important role in the growth and development of brain cells, especially brain nerve conduction and synapses.

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