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The wintering of the fish species was selected to ensure the success of pool protection
Entering a cold winter climate has an adverse effect on the safe wintering of fingerlings and is an important limiting factor in the production of fingerlings. Therefore, choosing the overwintering fish pond is crucial for improving the winter survival rate of the fish species. The wintering pool requirements are: fish pond area of ​​4-5 acres, sheltered from the sun, is conducive to raising the water temperature; dike sturdy, good water retention performance, convenient drainage, due to the winter dry season general inflow water source dry, wintering pond should have a good water source , ensure that you can enter the water; fish pond water depth of more than 2 meters; also comprehensive consideration of traffic and management convenience. The fish pond embankment can carry more than 5 tons of trucks, which facilitates the transfer of fish species and sales and transportation, and it is also convenient for patrol ponds and feeding. When the wintering pond is selected, it is timely cleaned and trimmed, water is injected 40-50 cm, 150-200 kg of lime are used for disinfection per acre, water is injected more than 1.5 meters after 2-3 days, 200 kg of organic fertilizer is applied per acre, and fertilizer is applied. Water quality. From our experiments in recent years, although the water temperature is relatively low in November, if the weather is clear and the water temperature exceeds 13°C, organic fertilizer and chemical fertilizers can be used in combination to achieve rapid fertility. The specific approach is to apply 80-100 kg of organic fertilizer per mu and apply 10 kg of ammonium bicarbonate and 30 kg of superphosphate. Appropriately increase the proportion of phosphate fertilizer, improve the phosphorus content of water, is conducive to enhancing the body's ability to resist cold. In places where the wintering conditions of the fish ponds are poor, the wintering of the cages can be selected. The healthy fish species will be transferred into cages to form a fish pond to cultivate fish species, and the cages will be linked to winter production systems. In particular, the full use of the wide water depth of the large water surface of the reservoir and the relatively stable environmental conditions for wintering the fish species will not only reduce the loss of winter fish species and management workload, but also facilitate the stocking and sale of fish species in the following year.