Grass Anguilla is actually blackfish,

it is the common name of snakeheads, which belongs to the family of perch, snakeheads,

It is the most widely distributed and productive species of snakeheads, and it is also known as blackfish, sang-fu, zaifu, snakehead, fireheads, and black snakeheads, etc.

Blackfish is fierce, and it is a bottom-dwelling fish, which belongs to the predatory fish, preferring to live in the shallow water with lush grasses, and it is also known as the "blackfish", and it is also called the "blackhead", and it is also called the "black snakehead. It is a carnivorous fish that prefers to live in shallow waters with lush vegetation. Blackfish meat taste delicious, nutritious, loved by consumers, is a kind of high economic value of fish; can remove blood stasis and new, nourishing and tonic, muscle tonic blood, promote wound healing, has a high medicinal value. China has a long history of eating snakeheads, which was listed as the best wormfish in the Divine Husbandman's Classic of the Materia Medica as early as 2,000 years ago.

Snakehead snakeheads are cylindrical in the front of the body and later laterally compressed. The head is long, slightly flattened at the front and slightly elevated at the back. The snout is short and rounded, the mouth is large and telescopic, the mouth cleft is slightly oblique and extends to the lower edge of the back of the eyes, and the lower jaw is slightly protruding. Teeth small, banded in upper and lower jaws, firm on both sides of lower jaw. Eyes small, superiorly lateral, residing in the anterior half of the head, rather close to the muzzle. Two pairs of nostrils, the anterior nostrils located at the end of the muzzle are tubular, and the posterior nostrils are located above the front of the eye, a small round hole. Gill slits are large, the right and left gill membranes are fused and not connected to the cheeks gill rakers are thick and short, sparsely arranged, and there is a gill epiglottis with an auxiliary function above the gill cavities on the left and right, which is capable of breathing air.

The main characteristics of Heilongjiang subspecies are: dark green-black dorsal color, irregular black-green color on the side of the body, dorsal and caudal fins are the same color as the dorsal, and the pectoral and anal fins are light in color. Life habits snakehead belongs to freshwater benthic fish, usually inhabiting the water grass or silt substrate, all over the rivers, lakes, reservoirs, ponds, paddy fields and other waters, the environmental factors in the body of water has a strong adaptability, especially to the dissolved oxygen, water temperature and water quality has a strong adaptability. When there is a lack of oxygen in the water body, it is able to breathe at the surface of the water with the help of the auxiliary respiratory organs in the upper gill cavity. Snakeheads can survive in water temperatures ranging from 0~41℃, and 16~30℃ is the optimal temperature for growth, development and reproduction of snakeheads.

When the water temperature recovers to above 8℃ in spring, the snakehead is usually active in the middle and upper layer of the water body; in summer time the snakehead is mostly active in the upper layer of the water body; when the temperature is lower than 6℃ in fall, the snakehead is slow to swim at this time, and often lurks in the depths of the water layer; in winter, when the water temperature is close to 0℃, the snakehead will be buried in silt to overwinter. Because of the strong jumping ability of snakeheads, the phenomenon of escape often occurs, the weather is hot, rain impact, rising water, etc. will cause the escape of snakeheads.

Snakehead snakehead is a carnivorous fish, fierce nature, large amount of food. The predator generally varies with the size of the fish. The young fish mainly feeds on rotifers, flexipeds, branchiostoma and larvae of mosquito; the young fish mainly feeds on the larvae of aquatic insects, small fish and shrimps, etc.; the adult fish feeds on a variety of small fishes and shrimps. The prey fish in different waters have great differences, but usually more for the waters of the dominant species. For example, snakeheads in Heilongjiang mainly prey on crucian carp, carp, Yaluo fish, suspensory fish, snakeheads and so on; the Yangtze River Basin is dominated by loach, loach, loach, crucian carp and suspensory fish. In addition, snakeheads also have the habit of killing each other. Snakehead's food quantity has a close relationship with the temperature of the water body, when the temperature of the water body is high in summer, snakehead's food quantity is very big; when the temperature of the water body is below 12℃, it will stop feeding.

Nutritional value of protein snakehead is rich in nutrition, rich in protein, snakehead muscle contains 17.63% of crude protein (higher than China's four major freshwater fishes), muscle amino acid content accounts for 77.07% of the total amount of amino acids, of which the total amount of seven essential amino acids is 29.73%, and four kinds of flavor amino acids (aspartic acid, glutamic acid, alanine. glycine) is 31.73%, and four kinds of amino acids (aspartic acid, glutamic acid, alanine. glycine) is 31.73%, Glycine) was 31.01%, which may be the reason for the delicious flavor of snakehead. The crude protein content of snakehead muscle was 17.63% (male) and 18.89% (female), and it contained 18 kinds of amino acids, among which 8 kinds of essential amino acids and flavor amino acid content were higher. Using the amino acid evaluation model, it was found that the composition of essential amino acids in each part of the male and female snakeheads was more complete, with the male muscle having a score of 53 points, and the female muscle having a score of 50 points. The protein content of snakehead muscle (16.94%) was higher than that of Siniperca chuatsi, grass carp, silver carp, bighead carp, Chinese soft-shelled turtle, scallop, shrimp and egg.

Snakehead snakehead is a low-fat food with delicious meat flavor, favored by many consumers, especially suitable for nourishing and tonic. Current research has found that the fat content in snakehead is low, and the effect of feed nutrient levels on the growth rate of snakehead quality in aquaculture is as follows: protein > inorganic salts > sugars > fat, with fat showing up as the lowest.

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