Shape characteristics of herring

Body length, slightly cylindrical, flat tail, round abdomen, no abdominal ribs. The head is slightly flat and the tail is flat. The mouth is in an arc position. The upper jaw is slightly longer than the lower jaw. No need. 1 row of hypopharyngeal teeth, molar-shaped, smooth chewing surface, no grooves. The dorsal fin and the anal fin have no hard spines, and the dorsal fin is opposite to the ventral fin. The back and upper part of the body are bluish black, the abdomen is grayish white, and all fins are grayish black.

The main body is cylindrical. The abdomen is flat and round, with no abdominal margin. The tail is slightly flat. Kiss is blunt, but sharper than grass carp. The posterior end of the maxilla extends below the anterior edge. The distance between eyes is about 3.5 times the diameter of eyes. Gill harrow 15 ~ 2 1, short and mastoid. A row of pharyngeal teeth, 4(5)/5(4), generally asymmetrical left and right, with wide tooth surface and mortar shape. Scales are big and round. Sideline scale 39 ~ 45. The body is blue and black, and the back is deep; Fins are grayish black, especially lateral fins.

Spanish mackerel belongs to Perciformes, and its scientific name is mackerel. Blue mackerel is also commonly known as swallow fish, mackerel, bamboo mackerel, mackerel, green arrow and so on. Spanish mackerel is flat, silvery and shiny, with dark stripes or bluish-black spots on its back, big mouth, sharp teeth at the tip of its mouth and nose, fast swimming and fierce temperament. Generally, it is 260-520 mm long, up to 1 m, and weighs more than 20 kilograms. Distributed in the western part of the North Pacific Ocean, it is found in the East Yellow Sea and Bohai Sea in China. Spanish mackerel, a warm pelagic fish, feeds on small pelagic fish and migrates to the offshore in summer and autumn, and some of them enter the Bohai Sea to lay eggs. In autumn, it often feeds in groups near coastal islands and reefs, and is one of the economic fish in the northern waters.