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Second, feeding off: When the water temperature reaches 10 °C, the fish began to feed and grow. Feeding in early spring should be concentrated feed such as bean cake, wheat bran, and corn flour, which should be fed once a day and regularly at a time. Each feed should be 1.5 to 3% of fish's body weight. Later, as the water temperature increases, the number of baits is gradually increased, and they are fed twice a day. At the same time, the ponds that raise the grass carp should be fed appropriate amounts of aquatic grasses. How much should be fed, they should be eaten for 4 to 6 hours after casting. It's better. The specific amount of feeding should also be based on the water temperature, weather and fish feeding conditions.
Third, the injection of water off: Early spring due to low water temperature, individual fish small, active food intake, pool water should not be too deep. As the water temperature rises, the fish body increases and gradually deepens the water level. In early spring, it is best to change the water once, and change it to 1/2 of the whole pool. Every 15 days after the water injection, raise the water level every time 10 to 15 centimeters, from March to April to maintain the pond water level about 1 meter, at the same time, to prevent the influx of sewage and enemy pests.
Fourth, disease prevention: the pond must have special management, adhere to the daily morning and evening patrol pond, check the water quality fat, determine the amount of fertilizer and feeding. Timely salvage the bait, keep the pool water clean, and prohibit the feeding of deteriorating feed. Drugs for the prevention of fish disease are regularly carried out. Every 15 days, 1PPm bleach and 0.7 ppm copper sulfate aqueous solution are sprayed alternately. If fish diseases are found, diagnosis and treatment should be promptly conducted.
Open spring fish farming "four customs"
First, fertilization off: In the early spring when the pond water temperature is stable at 8 °C ~ 10 °C, that began to chase fertilization material to cultivate natural food in water. The amount of fertilization should be determined based on the quality of water, fertilizer, and fertilizer. Generally, 60 to 90 kilograms of human excrement are used in Mu, or 100 to 150 kilograms of livestock manure. If chemical fertilizers are used, the ratio of nitrogen, phosphorus, and potassium is 1:1:0.5. After topdressing, the total amount of water per acre is 3 to 7 kilograms and the interval between topdressing is 5 to 10 days. . Keep the water quality of the pool yellow-brown or yellow-green, with a transparency of about 30 cm.