1. Biological oxygenation. Before freezing, some fertilizers containing phytoplankton should be injected for introduction, but the amount of water injected should not exceed 1/5 of the total amount of pond water. If the winter pond water is lean, 0.5 to 1 kg of urea and superphosphate can be applied to each mu of water, but no organic fertilizer can be applied to avoid polluting the water. Fertilization time should not be too early, it is best to be carried out immediately before freezing, in order to avoid premature propagation of algae, and reduce the oxygen content of later water. 20 days of lime splashing, each time 1 meter per mu with lime 10 kg, will help improve water photosynthesis capacity.
2. Fill water with oxygen. During winter, when there is a lack of water or oxygen in fishponds, water can be diverted directly into the pond. If the oxygen content in the water source is low, the water flow can be subjected to a certain process and drop, and the oxygen content can be increased and then injected into the pond to improve the effect of supplemental oxygen. It should also be noted that excess iron-containing water must be subjected to a certain amount of time of storm gas, oxidation and precipitation before it can be injected into the pond in small quantities. Take water injection and oxygen supplement measures, we must pay attention to early implementation to prevent the lack of oxygen due to a water injection too much or water injection time is too long, leading to rapid changes in pond water temperature and fish swimming. Each time the water injection and the amount of water injection should be based on specific circumstances. To minimize the water injection time, the depth of ice water is generally about 2 meters.
3. Inflation oxygen. Use a windmill or other power to drive the air pump to press the air into the hose set under the ice water, attach a filter on the top of the hose, or directly pierce the holes in the hose to let the air diffuse into the water with very small bubbles. Increase air-water contact area and increase dissolved oxygen in water.
4. Chemical oxygenation. For small water bodies such as wintering in greenhouses and overwintering in aquariums, in the event of hypoxia, chemicals may be added for oxygenation and first aid. Currently used chemical oxygenation agents are: ammonium peroxodisulfate, calcium peroxide and hydrogen peroxide. The amount of ammonium peroxodisulfate used was 10 grams per cubic meter of water, and the amount of calcium peroxide and hydrogen peroxide was 10-20 ml per cubic meter of water. The amount should not be too much, so as to avoid damage to the fish.
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