In early Qingtang, 7 to 10 days before the stocking of fish species, the water depth of 1 meter per mu of pond is reduced by 135 kilograms of quicklime, and the water level of the pond is reduced to 10 to 20 centimeters in depth. 75 kilograms of lime are used per mu. After splashing, splash. This will not only kill all kinds of bacteria and wild fish, prevent the occurrence of fish diseases, but also increase the calcium content of fish pond water. When the temperature of the water is stable above 8°C after early spring, the fish species must be released. Fish species are required to be physically strong and have neat specifications. Before ponds, fish should be soaked with 3% to 5% saline or 0.08% to 0.1% bleach solution for 20 to 30 minutes. Early fertilization When the pond water temperature reaches 5°C, fertilization should be used to develop plankton in the water. Fertilization depending on the pool water and fat is thin, usually per acre pond can be spilled fresh human excrement 50 to 100 kg or wet livestock excrement 150 to 250 kg. When chemical fertilizers are applied, nitrogen and phosphorus fertilizers are mainly used, supplemented by potassium fertilizers, and the ratio is 2:2:1, which is applied once every 7-10 days. Early-feeding grass carp, herring, and squid began feeding when the water temperature rose to 10°C. After the beginning of spring, the plants and concentrates are mainly fed, followed by plants and dry grass.
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