First, remove the snow cover During the winter ice-covered period, if it encounters snowy weather, it is necessary to timely remove the snow on the surface of the fish pond ice, so that sunlight can reach the fish pond water to ensure the normal photosynthesis of green plants in the water. Second, after the ice-breaking, oxygenated 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, and at the same time, the ice cubes must be crushed. Out, so as not to quickly freeze again. 3. In addition to adding new water In addition to maintaining the highest level of oxygen-increasing heat during the wintering of fish, new water should be injected regularly to improve the fish's living environment, increase dissolved oxygen, and water injection should be conducted once every 20 days. If the water quality of the pond deteriorates and aging occurs, the old water and harmful substances in the pool should be discharged in a timely manner. 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 fish pond water quality is thin, you can apply certain inorganic fertilizer at noon on sunny days, which can not only promote the growth and warmth of phytoplankton in water, but also increase dissolved oxygen in water by photosynthesis. Fertilizer should contain nitrogen and phosphorus. Two ingredients. 5. Regularly stirring ponds The purpose of regularly stirring ponds is to loosen the sediment and mix the upper and lower water bodies to promote the rapid decomposition of harmful substances at the bottom of the pool. At the same time, it is necessary to ensure that the fish will not be deprived of oxygen during the wintering period. The method is to stir some of the bottom of the pond with bamboo rafts at noon on a sunny day, and then stir the other part of the pond over a period of time. Sixth, splashing agents regularly put appropriate amounts of lime, bleach and other chemical agents in ponds to increase dissolved oxygen in fish ponds and improve water quality.
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