In winter, when heavy snow falls on the surface of the ice, sunlight cannot directly enter into the pond water, and the green plants in the water cannot produce photosynthetic oxygen. In addition, most of the fish gather in the bottom of the water during the winter. If the water quality is poor, the fish is weak, and the management is not good, it can cause fish to lose oxygen and suffocate. Here is how to prevent fish hypoxia in winter:
First, remove the snow. During the winter ice-covered period, in case of snowy weather, the snow on the surface of the fish pond should be promptly removed to make the sun shine into the fish pond water, so as to ensure the normal photosynthesis of the green plants in the fish pond water, and release oxygen in time.
Second, ice breaking oxygen. After the water surface is frozen, it is necessary to open the ice surface every morning and evening. Generally, 5 to 6 square meters of ice eyes should be opened per acre of fish ponds. At the same time, it is necessary to remove the crushed ice cubes so as to avoid further Icy quickly.
Third, add new water. In addition to maintaining the highest water level for oxygenation and warmth during wintering, fish should also regularly inject new water to improve the living environment of fish and increase dissolved oxygen. Normally, water injection should be conducted once every 20 days. If the water quality of the pond is poor and there is an aging phenomenon, the old water and harmful substances in the pool should be promptly discharged. The amount of water changed every time is 1/3 of the original pond water, and then the new water is injected in time.
Fourth, appropriate fertilization. When the water in the ponds is lean, certain inorganic fertilizers can be applied at noon on sunny days to promote the growth and warmth of the phytoplankton in the water, and to increase dissolved oxygen in the water through photosynthesis. The fertilizer is mixed with nitrogen and phosphorus. .
Fifth, regularly stir the pond. The purpose is to loosen the sediment and mix the upper and lower body of water, promote the rapid decomposition of harmful substances at the bottom of the pool, and keep the fish at a certain rest period during the wintering period, so as not to cause oxygen deficiency. The method is to stir part of the bottom of the pond with bamboo rafts at noon on a sunny day. After a while, stir another part.
Six, splashed with drugs. Regular amount of lime, bleach and other chemical agents are put into ponds to increase oxygen in fish ponds and improve water quality.
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