Technology of cultivating black fish in summer flower cement pond

Black fish I think many people have eaten in life, people who have eaten black fish know that its meat is very delicious, and the nutrition is very rich, whether it is braised or stewed is a delicacy. Therefore, at present, in China's aquaculture industry, blackfish is more popular with farmers.

Technology of cultivating black fish in summer flower cement pond

1. The structure and disinfection of the cement pool: the size of the cement pool is designed to be 5 square meters and 80 centimeters high. The inlet and outlet are equipped with anti-escape facilities, and the bottom is ploughed from the inlet to the outlet. Each pool is equipped with a food table, which is about 20 centimeters below the surface of the water. The cultivation pond is covered with a plastic greenhouse to keep the environment relatively stable. When designing the cultivation pool, we should also take into account the convenience of operation and management and disease prevention and treatment.

The cultivation pond should be strictly disinfected before throwing seedlings. If a new cement pool is built, it must be soaked in clean water half a month to 20 days in advance, the alkalinity in the new pool must be removed, and then it will be thoroughly disinfected and cultivated into a tender green. The water quality can be cultivated in the reservoir.

2. Stocking density: water-stop culture, 400,500 larvae per square meter. Micro-flow cultivation, up to 600 million per square meter, the highest up to 1000 per square meter.

3. Feed and feeding methods: the larvae in the pond still feed on live zooplankton, feeding 0.2-0.3 kg zooplankton per 10,000 larvae per day, but should be adjusted according to the actual food intake of fish fry. Make sure it has enough to eat so that its growth rate can be guaranteed and it has a strong physique. Overfeeding will cause zooplankton to compete for oxygen with fish fry, and at the same time, a large number of zooplankton will soon die and pollute the water quality, resulting in the death of fish fry. After the fish fry reached 2 centimeters long, in addition to feeding live red worms, 1 or 2 bags of dead red insects were hung on the table and began to be domesticated to feed on dead red insects. There are 500 grams of red worms per ten thousand fish fry, an increase of 300 grams and 500 grams every 5 days. If the red worm is in short supply, dry yeast and surimi can be added to the dead red worm. Practice has proved that the feeding amount must be sufficient to make the fish fry grow fast and the survival rate is high, otherwise the fish fry will be significantly reduced. When feeding in hanging bags, the quantity of each bag should not be more, but the number of hanging bags should be more, so that the fish fry will have more chances to eat and grow evenly.

4. Aquaculture management

① water quality regulation: the dissolved oxygen in the water body in the seedling cultivation stage is not less than 3.2mg / L, while in the cement pond cultivation stage, due to small area, shallow water, high stocking density, more organic matter accumulation and rapid change of water quality. Therefore, stop-water cultivation should change water frequently, change once or twice a day, remove the residual bait on the table before changing water, absorb dirt at the bottom, etc., and then replace it with 1 pound, 3 pounds, 1 pound and 2 ponds of water. Timely increase oxygen, water surface green to improve the water environment.

② timely separate culture: according to the actual observation, when the fry is about 2 cm long, there is not only size differentiation, but also cannibalism, especially in the case of insufficient feeding. Therefore, when the fish fry is more than 2 cm long, it is necessary to divide the fish fry on a regular basis, generally changing the pond once every 7 to 10 days, and sieving the fish fry. After 2-3 times of separate culture, the fry is up to 3-4 cm long and can be moved into a cage or soil pond to cultivate fish fry.

③ strengthen pond patrol: pay attention to observe the feeding, activity and water quality changes of fish fry. If it is found that food intake is reduced, there are clusters stagnant on the water surface, slow response, wandering alone and abnormal body color should be paid attention to. Starting from water quality monitoring, fish body inspection and adjusting the amount of feed, we should take disease prevention and treatment measures in time; find out the problems existing in the production process and correct them in time; when patrolling the pond, we should also pay attention to whether the escape facilities are in good condition to prevent the escape of seedlings.

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.

The culture cycle of black fish

The fry of black fish are generally released from May to July, depending on the differences in regional air temperature, water temperature, climate and other conditions.

It is difficult to determine how long it takes for black fish to grow to 1500 grams, which is related to your culture technology level, bait quality and other factors, depending on the actual culture environment and so on. It is recommended that you choose good ponds, high-quality seedlings and good-quality bait in the process of culture, and do a good job in daily management and disease prevention in peacetime, so as to shorten the culture cycle of black fish as much as possible.

If the culture method is correct, the culture cycle of black fish can be one and a half to two jin a year.

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.

Although there is a great market demand for black fish and the prospect of culture is very good, farmers still need to master certain culture techniques and skills and master some daily knowledge of culture, which is very helpful to culture.