As shown in the figure, it may be

Silurus belonging to Siluridae of Siluridae

The following picture shows Silurus soldatovi, commonly known as Silurus japonicus and Silurus japonicus, which are native to Heilongjiang Province, and are distributed in Songhua River, Wusuli River, Nenjiang River and some large lakes. Silurus asotus has strong adaptability to the environment, tolerance to hypoxia, fast growth, easy feeding and high catching rate, and its fry can be developed into commercial fish in the same year.

long body, flat tail and head. The head is long and flat. The kiss is blunt and round. The mouth is large, sub-superior, the upper jaw is shorter than the lower jaw, and it extends back beyond the posterior edge of the eye; Jaw teeth exposed; 1 pair of maxillary whiskers, reaching the pectoral fin; There are 2 pairs of mandibular whiskers, and the anterior whiskers are longer than the posterior whiskers.

I prefer to live in main rivers and tributaries, but I don't like to go to lake areas and flood areas. For the middle and lower layers of fish. Sex is not very lively, mostly inhabiting the bottom of water during the day and swimming to shallow water for food at night. After autumn, they live in deep water or spend the winter in sludge. The feeding intensity is weakened in winter. It is a fierce carnivorous fish, feeding on fish and other aquatic animals. The age of sexual maturity is 3 winter years or older. The growth rate is fast, and the body length can reach about 56-58 mm in 2 winter age and 675-685 mm in 3 winter age. According to records, the largest individual is 2 meters long and weighs 4 kilograms.