The overwintering pool is selected to keep the depth of the wintering pool at 2 to 2.5 meters, and the area is suitable for 2 to 5 mu. The bottom of the pool is flat, and the thickness of the sludge does not exceed 15 cm. The water retention performance of the pond is good. It does not leak water all year round and its water quality is good. It is best to have a suitable water source for the wintering of fish during the winter, and it can replenish new water as needed. Over-winter ponds must be sterilized with fresh lime ponds to prevent fish from becoming ill and improve water quality.
It is not too early for fish ponds and ponds to be used too early. Because of the high temperature, when the nets are caught and caught, the fishes are violent, and they are prone to traumatic fish. When the pond is to be selected, it should be sunny and windless, and the water temperature should be between 8°C and 10°C to prevent fish body from freezing and falling ill. Note that the fish species in the same pond should be stocked with the same specifications and should not be crowded together. The stocking density should not be too large. The depth of water in the still water surface should not exceed 150 kg per mu for 1 meter, and the water depth should not exceed 250 kg for 2 meters. The fish species to be incorporated in the wintering pond should be pre-washed with 3% saline and 3% aqueous sodium bicarbonate solution. Fish 5 to 10 minutes can effectively prevent the occurrence of fish diseases such as watery mildew.
Management measures When the pond is frozen, it is necessary to break the ice and increase oxygen. In general, two ice eyes with a length of 4 meters and a width of 3 meters are opened per acre of water. When the snow is removed in time, the larger the area cleaned, the better. For the wintering pond with leakage, fresh water should be added once every 20-30 days, but the amount added every day should not be too large. For overwintering pools, where it is difficult to make up water, inorganic fertilizers can be topped up and phytoplankton can be grown to increase the amount of dissolved oxygen in the water. Each time, 2.5 kg of urea and 2 kg of superphosphate can be applied. The method is to mix the two fertilizers into a thin-eye cloth bag and hang it under ice water. Ponds with good hydration conditions may or may not apply chemical fertilizers. If the pond has good light transmission, the plankton biomass is not large, and the water color is thick, but the dissolved oxygen status is not ideal, it may be due to the lack of fertilizer in the pool water, and timely fertilizer should be applied. Once there are a large number of planktonic organisms breeding, such as sword water or more rotifers, it will directly affect the oxygenation effect. To kill, kill it with 1-2 mg/kg crystal trichlorfon.
It is not too early for fish ponds and ponds to be used too early. Because of the high temperature, when the nets are caught and caught, the fishes are violent, and they are prone to traumatic fish. When the pond is to be selected, it should be sunny and windless, and the water temperature should be between 8°C and 10°C to prevent fish body from freezing and falling ill. Note that the fish species in the same pond should be stocked with the same specifications and should not be crowded together. The stocking density should not be too large. The depth of water in the still water surface should not exceed 150 kg per mu for 1 meter, and the water depth should not exceed 250 kg for 2 meters. The fish species to be incorporated in the wintering pond should be pre-washed with 3% saline and 3% aqueous sodium bicarbonate solution. Fish 5 to 10 minutes can effectively prevent the occurrence of fish diseases such as watery mildew.
Management measures When the pond is frozen, it is necessary to break the ice and increase oxygen. In general, two ice eyes with a length of 4 meters and a width of 3 meters are opened per acre of water. When the snow is removed in time, the larger the area cleaned, the better. For the wintering pond with leakage, fresh water should be added once every 20-30 days, but the amount added every day should not be too large. For overwintering pools, where it is difficult to make up water, inorganic fertilizers can be topped up and phytoplankton can be grown to increase the amount of dissolved oxygen in the water. Each time, 2.5 kg of urea and 2 kg of superphosphate can be applied. The method is to mix the two fertilizers into a thin-eye cloth bag and hang it under ice water. Ponds with good hydration conditions may or may not apply chemical fertilizers. If the pond has good light transmission, the plankton biomass is not large, and the water color is thick, but the dissolved oxygen status is not ideal, it may be due to the lack of fertilizer in the pool water, and timely fertilizer should be applied. Once there are a large number of planktonic organisms breeding, such as sword water or more rotifers, it will directly affect the oxygenation effect. To kill, kill it with 1-2 mg/kg crystal trichlorfon.
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