Prevent shallow water overwintering pool shallow, rapid changes in water temperature, temperature difference, adverse to fish growth. After the water level drops, the fish population density increases accordingly, and it is easy to cause lack of oxygen and stop the fish from growing or even die. Therefore, winter ponds should maintain normal water levels.
Anti-hypoxia Under normal circumstances, hypoxic pans occur mostly in the summer and autumn high temperature season, and rare in winter. However, in the Feishui Fish Pond, Shentan Deadwater Fishpond, and cage culture conditions, dead fishes with hypoxia can also occur in the winter. In the above waters, as the temperature drops, the temperature of the surface water drops, the density increases, and it sinks. The lack of oxygen in the bottom layer and the ooze-free floating of water will cause severe oxygen deficiency in the upper water. In addition, the photoperiod in the winter is short, the photosynthesis of the phytoplankton in the water is weakened, and the oxygen production is reduced, which also results in insufficient oxygen in the aquaculture water. Woven Bags Therefore, oxygenation measures should be taken timely in these waters to prevent flooding.
Cold winter cold-resistant winter fish species are vulnerable to cold damage, can take the following measures to avoid cold and warm: (1) shelter from cold. Piling on the north side of the pond, weave a woven bag or straw curtain as a barrier to reduce the cold currents. (2) warming by manure. About 500 kilograms of fermented and cooked manure was applied per acre pond, and the water temperature was increased by utilizing the heat released from the fermentation of fertilizers. (3) Smoke heating. During the winter day, the north wind whistled, and there was often frost at night. It was possible to use fire and straw to burn smoke on the shore to reduce frost. (4) Putting water plants. In winter, fishes are put into the fish ponds to allow them to avoid the cold in the grass. (5) Increase water injection. After a sunny day with high temperatures, the water in shallow water ponds with higher water temperature is injected into fish ponds to raise the temperature of fish ponds.
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