The herring is known as the Pacific herring, and in China it is called the "green herring". Herring head is small, the body is streamlined, body extension and lateral compression, the dorsal fin is located in the middle of the body and the ventral fin opposite, the dorsal side of the blue-black, the ventral side of the silver-white, for the cold-water pelagic fish, usually inhabiting the deeper waters, the body of the fat, high nutritional value, for one of the important exports of aquatic products.