First, stocking should be "three levels"
According to the local food and water quality conditions, determine the main breeding species. Rich in aquatic plants, it is advisable to raise grass carp and carp. The source of fertilizer is sufficient, and it can raise squid, squid, squid and tilapia. The areas of snails and clams can raise herring and salmon. The amount of stocking depends on the conditions of the pond and the level of feeding and management. Intensive culture of fish ponds generally put 1,500 to 2,000 tails per acre, and crude fish ponds have 500 to 1,000 tails per mu. The following three levels should be taken into consideration during the stocking process:
1. Clear disinfection of the pond. The pond must be thoroughly rectified before stocking. Pump dry ponds, remove excess silt, repair pond bases, and access sluice gates. Then use 100 kg of lime and 60 kg of tea bran per acre. After breaking the water for 48 hours, the whole pool will be splashed.
2. Disinfection of fry. Fry disinfection is a practical and effective method of cutting off pathogens and preventing fish diseases. Before the fish fry under the pond, they should be washed with 10 mg/kg bleaching powder or 8 mg/kg copper sulfate solution for 20 minutes, or they can be soaked with 4% saline solution for 20-30 minutes.
3. Fry stocking off. Choose sunny fry when temperatures are high and avoid rain, snow, and windy weather. Stocking sites should be chosen to shelter from the sun.
Second, adjust the water quality to be reasonable
Within the appropriate temperature range, fish will increase food intake and increase growth as the water temperature rises. Therefore, the water level of the fish pond in early spring should be controlled at 0.6-0.8 meters, so that the water temperature can be raised quickly to facilitate the full play of the fertilizer effect and promote the fish to eat earlier. In case of continuous rainy weather, the depth of pool water should be increased to prevent the water temperature in the pool from changing too much.
In the course of breeding, if water quality is found to be aging and acidic, 20 cm deep new water can be injected, and 20-30 kg of quicklime can be splashed into the water per acre. When the water quality is lean, appropriate organic fertilizer should be applied to maintain the medium-fertilizer quality. The water body transparency should be 30-40 cm.
Third, investment and fertilization should be scientific
1. Fertilization. In the early spring, organic fertilizers are mainly used to cultivate plankton.
2. Feeding. Timely feeding of nutritious artificial compound feeds to enhance the body composition of fish and accelerate their growth. The practice of opening food: when the surface water temperature of the fish pond reaches 3°C, feed once a week; when the water temperature of the surface of the fishpond rises to 10°C when the weather is warm, it is necessary to feed it once a day or every other day. Each feeding amount is about 1/6 of the amount of feeding in summer and autumn, or eating in 3-5 hours. At the same time, domestication can be carried out by feeding a small amount of fine scraps in the vicinity of the food table during the first 3-5 days to attract food, and then gradually narrowing the spread until it is fed on the table. It can improve the utilization of bait.
Fourth, fish disease prevention should pay attention
If the fish is starved for a long time, it will cause growth stagnation and increase disease. Therefore, strengthening the early feeding and management of fish is an effective way to increase fish disease resistance. Diseases of fish should adopt the principle of “prevention from prevention and combination of prevention and treatmentâ€. In the spring, each month, 20 kg of lime in lime should be splashed or disinfected with bleach solution. If there are parasites such as trichomonads, maggots, etc., a solution of copper sulphate and ferrous sulphate (5:2) can be used to sputter.
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