Black herring is also called black pomfret and snail green. Bony fish, CYPRINIDAE. The body is nearly cylindrical, bluish-black, and the fins are gray-black. The head is wide and flat, and the mouth end position is unnecessary. Pharyngeal teeth are molars. Habitat in the middle and lower levels, the staple food snails, mussels, shrimp and aquatic insects. Laying eggs in the upper reaches of rivers can be artificially propagated. The individual is big and grows fast. It is the main freshwater fish culture object in China. It is distributed in major water systems in China, mainly in the plain south of the Yangtze River. Fish gall is poisonous. Spanish mackerel, also known as mackerel, is a bony fish, Perciformes, Shoeraceae. Spanish mackerel is long and flat on its side, bright silver in color, with dark stripes or black-blue spots on its back, big mouth, sharp teeth, fast swimming speed and fierce temperament.

Herring:

Herring is a fish of CYPRINIDAE and Herring. Body length can reach 145 cm. Body length is 3.3 ~ 4. 1 times of body height and 3.5 ~ 4.4 times of head length. The body is stout, nearly cylindrical, with a round abdomen and no abdominal ribs. The dorsal fin is located above the ventral fin, without hard spines, and the outer edge is straight. The body is bluish gray, the back is deep, the abdomen is gray, and the fins are all black. The individual is large, and the maximum can reach more than 70 kilograms. Black herring usually lives in the middle and lower layers of water and is inactive by nature. Its main food sources are snails, clams, clams and so on. , occasionally preying on shrimp and insect larvae. Mainly distributed in China, Russia, Vietnam, Albania, Armenia, Austria, Bulgaria, Costa Rica, Cuba, Czech Republic, Hungary, Japan, Kazakhstan, Latvia, Malaysia, Mexico, Moldova, Morocco, Panama, Serbia, Slovakia, Thailand, Turkmenistan, Ukraine, the United States and Uzbekistan.