It is the common name of snakehead, belonging to perciformes, snakehead family,

It is the most widely distributed and highest-yielding species in the family Lepidoptera, also known as mullet, raw fish, rich fish, snake fish, salamander, black herring and so on …

Snakehead is fierce and lives in benthic organisms. It belongs to carnivorous fish and likes to live in shallow water with lush aquatic plants. Snakehead is a kind of fish with high economic value because of its delicious taste and rich nutrition. It can remove blood stasis, promote tissue regeneration, nourish and recuperate, promote granulation and enrich blood, promote wound healing, and has high medicinal value. Eating snakehead has a long history in China, and it was listed as the top grade of insect fish by Shennong Materia Medica as early as 2000 years ago.

The front of snakehead is cylindrical and the back is flat. The head is long, slightly flat at the front and slightly higher at the back. The kiss is short, round and blunt, with a big mouth, an end position, a slightly oblique mouth crack and a slightly protruding jaw. The teeth are small, the upper and lower jaws are banded, and the teeth on both sides of the mandible are firm. Small eyes, high in position, in the first half of the head, very close to the nose and mouth. There are two pairs of nostrils, the front nostril is tubular at the snout, and the back nostril has a small round hole above the eyes. The branchial fissure is large, the left and right branchial membranes are healed, the branchial harrow is short and sparse, and there are auxiliary branchial devices on the left and right above the branchial cavity, which can breathe air.

The main characteristics of Heilongjiang subspecies are: dark green and black on the back, irregular black and green on the side, the dorsal fin and caudal fin are the same color as the back, and the pectoral fin and anal fin are light. Black snakehead, a freshwater benthic fish, usually lives in waters with overgrown aquatic plants or muddy sediments, and is distributed in rivers, lakes, reservoirs, ponds, paddy fields and other waters. It has strong adaptability to environmental factors in water, especially to dissolved oxygen, water temperature and water quality. When the water is short of oxygen, it can breathe on the water with the help of the auxiliary respiratory organs in the suprabranchial cavity. Snakehead can survive at 0~4 1℃, and 16~30℃ is the optimum temperature for its growth, development and reproduction.

When the water temperature returns to above 8℃ in spring, it generally moves in the middle and upper water bodies; In summer, snakehead mostly moves in the upper water body; When the temperature is lower than 6℃ in autumn, snakehead swims slowly and often lurks deep in the water layer. When the water temperature is close to 0℃ in winter, it will be buried in the mud for the winter. Because snakehead has strong jumping ability, it often runs away. Hot weather, rain impact and rising water level will all cause snakehead to escape.

Snakehead is a carnivorous fish with fierce nature and a large appetite. The prey usually varies with the size of the fish. The larvae and juveniles mainly feed on rotifers, copepods, cladocera and chironomid larvae. Young fish mainly feed on young fish, small fish and shrimps in aquatic insects. Adult fish prey on all kinds of small fish and shrimp. The fish they prey on vary greatly in different waters, but they are usually the dominant species in the waters. For example, the snakehead in Heilongjiang mainly preys on crucian carp, carp, yarrow fish, pomfret, snake fish and so on; The Yangtze River basin is dominated by spiny, loach, loach, crucian carp and ray. In addition, snakehead also has the habit of killing each other. The food intake of snakehead is closely related to the water temperature. When the water temperature is high in summer, snakehead eats a lot. When the water temperature is lower than 12℃, it will stop eating.

Nutritional Value protein snakehead is rich in nutrition and protein. The muscle of snakehead contains crude protein 17.63% (higher than the four freshwater fish in China), and the content of amino acids in muscle accounts for 77.07%, of which 7 essential amino acids account for 29.73% and 4 umami amino acids (aspartic acid, glutamic acid, alanine and glycine). The crude protein content of snakehead muscle is 17.63% (male) and 18.89% (female), and it contains 18 kinds of amino acids, among which 8 essential amino acids are high in taste. Using amino acid evaluation model, it was found that the essential amino acids of male and female snakehead were relatively complete, and both male and female snakehead were relatively complete. The content of protein in snakehead muscle (16.94%) is higher than that in mandarin fish, grass carp, silver carp, bighead carp, soft-shelled turtle, hairtail, prawn and fish eggs.

Snakehead is a low-fat food with delicious meat, which is favored by many consumers and is especially suitable for nourishing and recuperating. At present, it is found that the fat content in snakehead is low, and the influence of feed nutrition level on the quality growth rate of snakehead is: protein >; Inorganic salt > sugar > fat, and fat is the lowest.

The above answers are for reference only.