The spring fish stocking is a key technical link in fish farming production. It is directly related to the success or failure of the whole breeding and the level of aquaculture benefits. Therefore, spring fish farming should strictly implement “four customsâ€.
One is fertilization. In the early spring, when the pond water temperature was stable at 8°C-10°C, it began to chase fertilizer materials to cultivate natural food in the water. The amount of fertilization should be determined according to the quality of water, fertilizer, and fertilizer. Generally, the amount of manure is 60 kg - 90 kg, or the amount of livestock manure is 100 kg - 150 kg. 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 kg to 7 kg, and the interval between topdressing is 5 days. 10 days. Keep the water quality of the pool yellow-brown or yellow-green, with a transparency of about 30 cm.
The second is feeding off. When the water temperature reaches 10°C, fish begin to feed and grow. The early spring feeding should be based on concentrated feed such as bean cake, bran, and corn flour, which should be fed once a day and regularly. 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 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 with the appropriate amount of terrestrial grass. How much should be fed should be 4 hours to 6 hours after casting. After eating is better. The specific amount of feeding should also be based on the water temperature, weather and fish feeding conditions.
The third is the injection of water off. In early spring, due to the low water temperature, the individuals of the fish body 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. 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 cm -15 cm, keep the pond water level about 1 meter in March - April, at the same time, to prevent the influx of sewage and enemy pests.
The fourth is preventing disease. The pond should be managed by special personnel. Stick to the patrol ponds in the morning and evening every day. Check the water quality and determine the amount of fertilization and feeding. Timely salvage the bait, keep the pool water clean, and prohibit the feeding of deteriorating feed. Drugs are regularly administered to prevent fish disease. Every 15 days, 1ppm bleach and 0.7ppm copper sulfate aqueous solution are sprayed alternately. If fish diseases are found, diagnosis and treatment should be promptly conducted.
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