Preparation before black fish culture

When it comes to blackfish, we are still familiar with it. Blackfish is very common in our lives. It not only has high nutritional value, but also has certain medicinal value. But for novices who raise blackfish, there are still a lot of things they don't understand. Let's learn about it with Xiaobian.

Preparation before black fish culture

1, the choice of pond and water depth, after years of culture experience, the culture pond area is generally 1-3 mu, too large management is inconvenient. The best water depth is 1.5-1.8m, the water is too shallow, the capacity of the water is small, the water is too deep, and the water temperature at the bottom of the water should not be increased.

2. The ponds and fish bodies should be disinfected. Half a month before the fry is released, the ponds should be disinfected by dry ponds, and the ponds should be cleared with 100,150 kilograms of quicklime per mu. And kill or catch the old snakehead to prevent damage to the seedlings. Fish fry may be injured and infected with bacteria before stocking, so they should also be disinfected and go into the pond, that is, the fish can be soaked in 10-15min with 3% 5% salt water, or with 15g/m potassium permanganate solution for about 10 minutes.

3. The selection and release of fry. If the fry is released every other year, it can be released from March to April. 30005000 fry with a length of 16-20cm are generally released in March-April. If the stocking specifications are basically the same, there is no need for screening and separate culture after going into the pond. After 6-8 months of breeding, it can be listed in the same year. If the fry of the current year are released, 30-50g fry with a length of 3-5cm can be released from June to July, and 50007000 fry can be released, but they should be screened and separated 2-3 times to avoid killing each other, and they can be put on the market in the coming year.

4. escape prevention and infrastructure, snakehead is good at jumping and swimming against the current, so the pond inlet and outlet should have anti-escape measures, fences or nets should be set around the pond, and other equipment such as water pumps and aerators are needed.

Culture conditions of black fish

I. Pond selection

The pond of black fish culture should not be too large, and the general area should be 3-5 mu. The depth of the pond is 1. 5-2. 0 meters, bottom pool thickness 15 cm-20 cm, sufficient water source, convenient drainage and irrigation.

II. Release of fish species

The specifications for the release of fish species are based on the specifications of commercial fish in the market. At present, black fish weigh 0.7-2.0 kg and sell well. Therefore, the specifications for stocking fish seeds should be 75-100 grams per tail.

Stocking density should be determined according to feed sources, feeding techniques and other factors. Generally, 2000-2500 fish fry are put in per mu. At the same time, it can raise 400-500 silver carp fingerling, and the specification of each fish is 100-150 grams.

3. Feed feeding

Blackfish is a ferocious solid-eating fish, eating both live and dead food. Regular and fixed-point domestication and feeding methods were adopted in artificial feeding. Feed twice a day, 10:00, 3 pm, the general fish species can all float to the surface for food after 5-7 days. When feeding, carefully observe the eating situation of black fish near the table. For example, when there are few black fish near the table and the rush for food is not intense, it indicates that the fish is full and can stop feeding.

IV. Feeding and management

Black fish have a large diet and a lot of excrement, which can quickly fatten the pond water. Fertilizer and water can make plankton multiply in large numbers, which is easy to cause hypoxia in pond water. Therefore, special attention should be paid to the changes of dissolved oxygen in water. Once the hypoxia is more serious, we can take the method of killing part of the water surface, that is, sprinkling larvae on the surface of 2-3 meters on the edge of the pond, the concentration is 0.5-1.0ppm.

Mixed culture of black fish

1. Mixed culture of domestic fish in black fish ponds

Due to the long-term feeding in the main black fish pond, the residue in the pond is increasing, and the fish excrement is also increasing, so the pond fertilizer and water is faster and easy to age. After mixed culture of some domestic fish, it can give full play to the mutually beneficial role between them, which can not only regulate the water quality, but also increase the fish yield.

2. Mixed culture of black fish in the main fish pond

Due to the strong ability of self-reproduction of common carp and crucian carp in the main domestic fish ponds, there are more seedlings of common carp and crucian carp, as well as more wild miscellaneous fish, which is not conducive to the growth of domestic fish. Adding a small amount of black fish can eat the self-propagating seedlings of wild miscellaneous fish and common carp and crucian carp, which can not only avoid the competition for oxygen and food of the seedlings, but also benefit the growth of domestic fish, but also obtain high-quality black fish and increase the benefit.

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.

Through the introduction of the above editor, presumably for the novice of black fish culture, they already have a preliminary understanding of black fish culture, but some problems that will be encountered in the specific culture process still need to communicate with other farmers and learn from each other's experience.