High-yield culture of black fish by "two-stage method"

Ophiocephalus Argus, also known as black fish, black fish, high economic value, the current price is 15-20 yuan / kg. We use the "two-stage method" pond intensive culture mullet, the net income per mu is 0. 9-12000 yuan. Black fish is a common fish in our country, and many people like to eat it.

High-yield culture of black fish by "two-stage method"

First, the requirements for pond construction: generally, adult fish ponds can be cultured, and the bottom of the pond is the best muddy. The pond is raised 0.5 meters high with bricks, fences or plastic nets to prevent mullet from escaping. The water depth of the pond should be 1-1.5m, the water source should be adequate, neutral or alkaline, and the water temperature should not exceed 30 ℃. Fish ponds with 500-1000 square meters, adult fish ponds 2000-4000 square meters is appropriate, it is best to use micro-flow culture. There are 5 kinds of water lilies or water peanuts on the water surface for mullet to hide the sun. The water injection hole is located at a height of 30 cm from the water surface to prevent the snakehead from escaping against the water during water injection.

Second, clear the pond for disinfection: before stocking, drain the pond water, remove part of the silt, and keep the mud 20 cm thick. Each mu of ponds are cleaned and disinfected with 100 kg of quicklime.

Third, fry stocking: the first stage is to strengthen the cultivation of large-size fish species, which is carried out in the fish pond. In the first ten days of September, the mullet fry with an average tail weight of 43 grams were strengthened to grow into large mullet fry with a stocking density of 7500 mullet per mu in 8 months. The second stage of stocking is in the first ten days of May of the following year, and the large-sized fish species cultivated in the first stage are put into adult fish ponds with a stocking density of 450-500 fish per mu. Mullet fry and fingerlings should be soaked in 3-4% salt water for 10-20 minutes before stocking.

Fourth, feed feeding: mullet is a fierce carnivorous fish, the key to the success or failure of culture lies in feed feeding. If the feed is insufficient, the phenomenon of cannibalism is serious. At present, the main sources of feed are live feed (small tilapia, small river fish, wheat ear fish, Loach, shrimp, etc.) and artificial compound feed. If all the mullet in intensive culture are fed live fish, the cost is high, and it is necessary to domesticate them to eat artificial formula feed. Domestication starts from an early age by mixing 80% minced fish meat and 20% flour or other binders into pellet feed. At the beginning of domestication, this feed can be mixed with water fleas, and gradually reduce the number of live baits such as water fleas, until in the end, all of them are fed with artificial pellet feed without water fleas. In the future, it can gradually transition to diet and feed. The diet uses pellet feed, and the content of crude protein is more than 40%.

Reference formula: animal feed (blood meal, livestock and poultry and aquatic products scraps, fish meal, etc.) 50%, plant feed (wheat bran, corn meal, etc.) 48%, bone meal 2%. Feed once every day from 7 to 8 a.m. and from 17 to 18:00 in the afternoon. Daily feeding amount: 5-8% of the stored fish weight in the peak fish growth season and 3-5% in other seasons. The actual feeding amount should be controlled flexibly according to the season, weather, fish activities and feeding conditions. The feed can be put in the radish basket and lifted into the pond for mullet to feed.

Fifth, water quality regulation: water should be added every 10-20 days, 20-30 cm each time. In summer and autumn, change the water once every 5-7 days, and it is better to keep the water running slightly.

6. Prevention and treatment of fish disease: water mildew disease can be sprinkled with 0.1 mg / kg bleach and 0.5 mg / kg methyl blue mixture; melon disease can be sprinkled with 0.1-0.2 mg / kg mercurous nitrate; myxosporidiosis can be sprinkled with 0.25-0.5 mg / kg crystal trichlorfon. Usually every 10-15 days, you can use 20-30 mg / kg bleach to sprinkle the whole pool, the disease prevention effect is good.

7. Timely fishing: mullet can be caught on the market when the specification reaches more than 500 grams. If only part of the fish is caught, in addition to pulling the net, the mullet can also pour new water into the pond according to the characteristics of the mullet, and set a net at the outlet to make it jump into the net to catch. If all the fish are caught, the pond water can be drained and the mullet can be pulled out of the mud with a mud plank.

How to raise black fish

1. Pond construction: choose the east-west direction, rectangular pond, the bottom of the pond is soil, the depth of the pond is 2-2.5 meters, the water depth is 1.5-2 meters, the inlet and drainage should be equipped with anti-escape facilities, and 100kg / mu of quicklime should be thoroughly disinfected 15 days before breeding.

2. Fish stocking: before entering the pond, the fish should be soaked in 3% to 5% salt water for 10 minutes for 15 minutes, and then put into the pond. The fish species with a body length of 10 centimeters and 14 centimeters will have a stocking density of 9000 million fish per mu and 16 fish species per mu, and the stocking density is 8000 fish per mu.

3. Daily management: pay attention to observe the feeding, activities, morbidity trend and environmental changes of black fish. Change the pool water 4 times a week in spring, a small change every 3 days in the high temperature season, a big change every 7 days, enter and drain to catch the escape net, and the pool ridge is more than 50 cm above the surface of the water. For the discharged sewage, the necessary sewage treatment should be carried out.

4. Feed feeding: feed for black fish, including artificial compound feed, small miscellaneous fish of fresh water or sea water, and scraps of livestock and poultry after slaughter. Before feeding, small miscellaneous fish need to be sorted to remove fish with hard spines, such as Pelteobagrus fulvidraco. Before feeding, use slapping as a signal to concentrate distant fish near the bait table to reduce feed waste. The initial feeding amount is 10% of body weight, and then it can be appropriately reduced to about 5% of body weight. It should be fed with one spoonful, so that the waste of feed is less.

Nutritional value of black fish

Black fish has high nutritional value, it is weak, hypoproteinemia, malnutrition, spleen and stomach qi deficiency, anemia has a very good food effect, eating black fish has a very good anti-inflammatory effect on the wound. Black fish itself is relatively thick meat, compared with other fish taste is not so good, it is not very delicious, but using black fish to make soup, the taste is invincible!

The vitality of black fish is very strong, and the meat is sweet, it contains a lot of iron, calcium, phosphorus and other minerals, nutrients are also very rich, including fat, protein, vitamin A, B vitamins and so on. In addition, every 100 grams of black fish, the protein content can be as high as 20 grams, second only to shrimp, and eating black fish is easy to be digested and absorbed by the human body, often eating black fish can enhance resistance.

Secondly, black fish also has the medicinal value of promoting blood circulation and dredging collaterals, invigorating spleen and promoting dampness, appetizer, warm lower qi, and has a good nourishing and therapeutic effect on patients with kidney and spleen weakness, ulcer, edema, asthma, tracheitis and diabetes; for postpartum pregnant women, it can also replenish deficiency and lower milk. In the cold and windy winter, the taste of black fish is especially delicious. Eating blackfish often can not only keep fit, but also lose weight, help to lower blood pressure and blood lipids, and prolong life. Traditional Chinese medicine believes that black fish can not only replenish deficiency, but also warm lower qi, promote diuresis and reduce swelling. Braised black fish is very effective in the treatment of gastrointestinal bleeding and vomiting.

Black fish culture in China is still relatively common, there are many black fish culture methods, farmers in culture, not only in the existing technology and methods of continuous innovation, but also research and development of new technology, in order to obtain more profits.