Chase fertilizer material. In spring when the pond water temperature stabilizes at 8°C to 10°C, fertilization begins. The amount of fertilization should be determined according to the quality of the water and the quality of the fertilizer. Generally, 60 to 90 kg of excrement per person per mu, or 100 to 150 kg of livestock manure. If chemical fertilizers are used, the ratio of nitrogen, phosphorus, and potassium is 1:1:0.5. When topdressing, the total amount of water per acre is 3 to 7 kilograms, and the interval between topdressing is 5 to 10 days.
Feed the bait. Feeding in the spring should be mainly concentrated feed such as bean cake, bran, and corn flour, which should be fed once a day and at regular intervals. The amount of each feed should be 1.5% to 3% of the fish's body weight. Afterwards, as the water temperature rises, the number of feedings is gradually increased, and feeding is repeated twice a day. At the same time, appropriate amount of plants should be fed to the pond that raises the grass carp, and the feeding amount should be 4 to 6 hours.
Water injection technology. In early spring, due to the low water temperature, the individuals of the fish are small and their food intake is small. The pool water should not be too deep. As the water temperature rises, the fish body increases and gradually deepens the water level. It is better to change the water once in the early spring and replace it by 1/2 of the whole pool. After 15 days of water injection, raise the water level by 10 to 15 centimeters each time, keep the pond water level 1 meter from March to April, and at the same time, prevent the inflow of sewage and enemy pests.
Disease prevention and control. Ponds should be managed by special persons, and they should stick to the morning and the evening to inspect the ponds, and timely salvage the residual food to keep the pool water clean. It is forbidden to feed deteriorating feed. Drugs are regularly administered to prevent fish disease. Sprinkle once every 15 days with bleach and copper sulphate solution. If fish disease is diagnosed and treated in time.
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