Frozen fish ponds need to prevent hypoxia

In winter, fish ponds often suffer from lack of oxygen due to ice on the surface of the water. The light affects the growth of fish, and in severe cases causes the death of fish due to suffocation. The commonly used method for determining the oxygen deficiency of fish ponds is to make an ice eye on the ice surface and observe the activity of the water color and underwater organisms. If it is found that the water quality is turbid, dark, and has rancid odor, there are leeches and other plankton at the ice eye, indicating that the pond water has become deficient and deteriorated, and the water should be changed as soon as possible. If it is found that both the small fish and the breeding fish swim to the ice eyes, indicating that the fish pond has been severely deprived of oxygen, measures should be taken immediately to supplement oxygen. The oxygen supplement method is as follows:

First, choose a deeper pond water, hit an ice eye per acre, so that the water surface contact with the air, increase the amount of water soluble oxygen. Ice eyes with 2 square meters to 3 square meters is appropriate. The ice eyes should be arranged in the direction of the wind in order to use the wind to speed up the dissolution of the pond water.

Second, for dead water ponds where water has deteriorated, in addition to applying oxygen to the ice surface in accordance with the above method, water should be injected once every 3 days to 5 days to increase the dissolved oxygen of pond water and improve the freshness of pond water. degree.

3. After the snowfall, the snow on the ice surface of the fish ponds should be cleared in time to maintain the transparency of the ice and enhance the photosynthesis of phytoplankton in the fish ponds.