Under normal conditions of prevention of hypoxia, the phenomenon of flooding in pan ponds is significantly reduced after entering the winter each year, which is significantly reduced compared with the summer and early autumn high temperature seasons. However, some ponds will also have flooding pools in winter, such as fish ponds in fertilizer ponds, fishes in deep-water ponds, and fishes raised in cages. Under these circumstances, fish often suffer from winter anoxic floating heads or even serious deaths due to neglect of management, causing large economic losses to fish farmers.
Freezing and cold damage often causes wintering fish species to be chilled. How can this be avoided? These methods can be used to avoid cold and warming: First, set aside obstacles and avoid damage. In the north side of the fish pond, use wood and bamboo sticks to pile on a woven bag or straw and set up an artificial barrier to resist the north wind. The second is to warm up the manure and invest about 500 kilograms of livestock and poultry manure per acre of water. Use the principle of fertilizer fermentation, decomposition, heat release to increase the water temperature. The third is smoking and heating. During the daytime, the north wind whistling is a precursor to frost at night. Wet straw and firewood can be piled on the shore of fish ponds to create a warm atmosphere and reduce the degree of frost. The fourth is to put water plants and put a certain amount of plants in the fish ponds in winter to allow the fish to warm up in the grass. Fifth, the water injection is heating up. After a sunny day with high temperature, the shallow water surface will be injected into the fish pond through the rising temperature of shallow water.
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