Weishanhu snakehead
Blackfish is a kind of fish with large yield in Weishan Lake. Strong adaptability and large reproduction. It is a famous "filial fish" and is deeply loved by people in the lake area. The snakehead meat is plump and delicate. Can be made into many dishes, which can be used as main ingredients, auxiliary materials and velvet antler. It is a fish raw material that many chefs like to use. There is a saying in the lake area that "it is better to lose the intestines of mullet than to lose mom and dad". Ophicephalusargus: Also known as snakehead, it is black, gradually becoming lighter in color from the back to the abdomen, with round scales. Get into the mud during hibernation. In the warm season, snakehead often needs to put its head out of the water to help it breathe after a period of activity in the water.
Grouper belongs to Perciformes, Suborders Perciformes, Epinephridae and Heracles. Commonly known as: snakehead, talented fish, mullet, black stick, snakehead, raw fish. English name: Argussnakeheadfish, the head of the northern snake. The body is slender, with a cylindrical front and a flat back. The head is pointed and flat, and the skull top, cheeks and gill cover are covered with scales. The mouth is big, the end position, and the lower jaw is slightly prominent. The maxilla, mandible, vomerous bone and flap bone all have sharp teeth. There is a wide suprabranchial cavity above the pharynx, which can breathe air. The bases of dorsal fin and gluteal fin are large, and the caudal fin is round. The body color is dark, with many irregular black spots on the side, two vertical and horizontal black stripes on the head side, and black and white stripes on the dorsal fin, gluteal fin and caudal fin; The pectoral fin and ventral fin are light yellow, and there is a black spot at the base of pectoral fin.
The snakehead is a fierce benthic carnivorous fish. It usually likes to live in shallow water with weeds at the bottom of the coastal mud, lurks in the weeds and waits for opportunities to hunt for food, and sometimes swims in the upper layer of the water at night. Usually swimming is very slow. In anoxic water, you can use the auxiliary respirator in the suprabranchial cavity to breathe from time to time, and a certain amount of gas is stored in the depression above the throat. Can survive for a long time after leaving the water body. In winter, in deep water, people bury their bodies in the soil for the winter and generally seldom eat. Spring and autumn are the peak seasons of feeding, and parent fish basically do not eat during spawning. Sexual ferocity, larvae feed on zooplankton; Young fish feed on aquatic insects, shrimp and small fish; Adult fish prey on other fish. The snakehead grows to maturity at the 2nd instar, and the number of pregnant eggs is 1.4-34000. From May to July, parent fish breed in still water shoals with lush aquatic plants. Parent fish are very active in pairs in the spawning ground, sometimes jumping out of the water. The male fish uses his mouth to build aquatic plants into a "fish nest" with a diameter of about 1 m. Before the quiet sunrise, the female fish first enters the fish nest, belly up, lying on her back, and her body slowly shakes to lay eggs; Then so does the male fish 0. After laying eggs, the male and female fish stay at the bottom of the nest together to protect the eggs and prevent the enemy from invading. After 2-3 days, the larvae hatch. Larvae live in groups in coastal aquatic plants, and males protect them with the group. When the young fish grow to 4-5 cm, the parent fish is no longer protected, and the young fish live independently in scattered camps. The snakehead grows rapidly, with the maximum individual length reaching 700 mm and weighing about 5 kg.
Blackfish are widely distributed. In addition to the western plateau, it is found in rivers, lakes, reservoirs, ponds and other water bodies from Heilongjiang to Hainan, and is produced in western and southern Korea abroad.
The range of origin of snakehead in Weishan Lake is Weishan Lake waters in Weishan County, Shandong Province (126600 hectares).
I. Source
Snakehead dragon
Second, the origin of water quality
1. Water source: Weishan Lake or well water.
2. Water quality requirements: the aquaculture water meets the national fishery water quality standards, and the sediments in the aquaculture area meet the environmental conditions of the national pollution-free food freshwater aquaculture origin. Sediment ≤20cm, water depth 1.5m to 2.5m ... water transparency ≥25cm, pH ≥ 6.5-8.5, dissolved oxygen ≥ 4mg/L. ..
Thirdly, aquaculture management.
1. Fish species standard: the first generation fish species bred by wild snakehead in Weishan Lake area or the fine variety bred by wild snakehead. The specification is 150g to 200g, and the fish has smooth surface, normal mucus, no injury or disease, and normal activity.
2. Culture method: pond culture.
3. Stocking time: from late March to the end of April, the water temperature is above 15℃.
4. Stocking density: 2000 ~ 3000 heads per mu.
5. Feed feeding: mainly feed fresh freshwater wild miscellaneous fish, such as wheat ear fish, rice strips, _ _ fish, broken crucian carp, etc. And feed the small miscellaneous fish with iced seawater. Frozen marine fish should be thawed, washed with lake water and fed. Feed 1 time every day from March to April. Feed twice a day from May to September, once at 9: 00 am 9:00- 10/0, once at 4: 00 pm, and once a day after 10. Feeding method: spread your hands evenly on your head, and stop feeding most fish after eating and swimming, and the feeding time is about 30 minutes each time.
6. Environmental and safety requirements: the feeding environment and the prevention and control of epidemic diseases must comply with the relevant provisions of the state and must not pollute the environment.
Fourth, fishing.
It can be fished all year round, and the fishing specification is ≥ 500 g.
The quality characteristics of verbs (abbreviation of verb)
1. Sensory characteristics: plump figure, round and long figure, gray-black body, dark back and head, pale white abdomen, seven-star stripes on head and back, many irregular black patches on the side, shiny, complete scales, not easy to fall off, turbid mucus and elastic muscle tissue. The meat is delicate, dense and delicious.
2. Physical and chemical indexes: the protein content of snakehead in Weishan Lake is ≥ 18.8%, and the fat content is ≥0.8%.
3. Quality and technical requirements such as safety: Quality and technical requirements such as product safety must comply with relevant national regulations.