How to do fish pond hypoxia in winter? How to cure?

The activity of fish decreases in winter, although the oxygen demand is not high, because the fish pond freezes, the water surface can not directly dissolve oxygen into the air, and the oxygen production of aquatic plants and other plants in the water decreases due to the decrease of temperature and the weakening of photosynthesis. it's easy to cause hypoxia in the water. How to do with lack of oxygen in fish ponds in winter? How to treat it?

1. Sweep away the snow

During the freezing period in winter, if you encounter snowy weather, the snow on the ice surface of the fish pond should be swept away in time to make the sun shine into the fish pond water to ensure the normal photosynthesis of green plants in the water.

2. Ice-breaking oxygenation

After the water surface is frozen, it is necessary to break the ice every morning and evening. Generally, 5-6 square meters of ice holes per mu of fish ponds should be broken. At the same time, the crushed ice should be fished out so as not to freeze quickly again.

3. Add and change fresh water

During the overwintering period, in addition to maintaining the highest water level to increase oxygen and heat preservation, new water should be injected regularly to improve the living environment of fish and increase dissolved oxygen. Generally, water is injected every 15 to 20 days. If the water quality of the pond becomes worse and there is an aging phenomenon, the old water and harmful substances in the pond should be discharged in time. The amount of water exchanged each time is 1x3 of the original pool water, and then new water is injected in time. Another reason for the lack of oxygen in the pond in winter is that the water quality is not properly treated in autumn, and the bottom of the pond should be treated before stopping, because we have to put a large amount of fish into the pond every day to feed the fish. the large amount of fish feces discharged into the pond results in a large amount of organic matter at the bottom of the pond, and the first and foremost problem is oxygen consumption, and the second problem is that rotifers like an environment with large organic matter. At this time, the content of organic matter is reduced by artificial treatment.

4. Appropriate fertilization

When the water quality of the fish pond is thin, a certain amount of inorganic fertilizer can be applied at noon on a sunny day. In this way, it can not only promote the growth and warmth of phytoplankton in water, but also increase dissolved oxygen in water through photosynthesis. fertilizer should contain nitrogen and phosphorus.

5. Stirring ponds regularly

The purpose is to turn the sediment to mix the upper and lower water bodies, promote the rapid decomposition of harmful substances at the bottom of the pond, and at the same time ensure that the fish will not be deprived of oxygen during the overwintering period. The method is to stir part of the bottom of the pond with bamboo sticks at noon on a sunny day, and then stir another part of the bottom after a period of time.

6. Sprinkle medicament

Add appropriate amount of quicklime, bleach and other chemicals to the pond regularly to increase the dissolved oxygen in the fish pond and improve the water quality. One of the reasons for the low dissolved oxygen in fish ponds in winter is that there are few algae in the water, rotifers occur in the water, the oxygen consumption of rotifers is very large, and there is an imbalance between rotifers and algae. After the algae are eaten by rotifers, the photosynthesis is low. The transparency of the remaining oxygen-producing algae is increased, and the water color is light. If this period is not treated artificially, it will cause great losses, such as fish surface bleeding at the edge of the fish arch in winter. Often swim in the upper layer, the upper water temperature is low, the fish body frostbite is serious (anoxic dead fish).