First, early release and early release of fingerlings in fingerlings will enable fish to adapt to a new living environment earlier, eat earlier, and grow earlier, which will relatively prolong the growth period. Generally from the winter solstice to the beginning of spring is the best time for stocking fish species. Fish species should be selected for sunny days when the temperature is not too low.
Second, anti-freezing injury Cold winter often make wintering species of fish suffered freezing damage, can take the following four ways to avoid cold and warming: (a) to set up shelter and shelter. In the north side of the pond, piles are piled with wooden sticks to woven bags or straw, and artificial barriers are installed to resist the north wind. (b) Smoking and heating. During the day, the north wind whistling is a precursor to frost at night. Wet straw and firewood can be piled on the shores of fish ponds to produce smoke and heat to create heat and reduce the degree of frost. (c) put water plants. In winter, fish ponds are given a certain amount of plants to allow the fish to warm in the grass. (d) Increased water injection. After the sunny days of high temperatures, shallow-tempered ponds are injected into the fish ponds.
Third, do not flush in the evening If the fish floating head is found during the day, do not flush the new water in the evening. Due to the small amount of dissolved oxygen in the water in the evening, especially at the bottom of the water layer, it has shown an anoxic state. In the evening, flushing will cause the upper and lower water layers to mix, making the whole pool lack of oxygen and causing damage to the fish.
Fourth, fingerling disinfection and immunization fish ponds should be immersed in drug disinfection, time is 5 to 10 minutes. It is better to inject vaccines such as grass carp.
Fifth, do not apply organic fertilizer to fertilize the water quality. It is necessary to apply fertilizer to fish ponds, but avoid applying organic fertilizer. Because organic fertilizer consumes dissolved oxygen, the pond is deprived of oxygen. Organic fertilizers also decompose to produce products such as hydrogen sulfide and ammonia that are toxic to fish and deteriorate the water.
VI. Preventing pan-tangs Under normal conditions, after entering the winter, the pan-tang phenomenon has been significantly reduced. However, the fish cultured in fertilizer ponds, deep-water ponds, and cages often cause winter hypoxia floating heads or even death due to management negligence. Farmers should often visit the pond and find problems to solve in time.
Seventh, bogey open aerators Winter fish pond oxygen aerator is not scientific. Because the aerobic machine fish will start to startle and swim in the water, the only energy in the body and the oxygen in the water will be consumed quickly, resulting in the fish body becoming weaker and weaker and gradually dying.
VIII. Early prevention of diseased fish Long-term starvation during winter, causing stagnant growth and increased disease, of which the most susceptible to hydromycosis. In winter, fish diseases should be diagnosed in time, and the right medicine should be used to prevent the dead fish.
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