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First, break ice and increase oxygen. After the fish ponds are frozen, in order to increase the amount of dissolved oxygen in the water, ice caves will be conducted once a day in the morning and evening, and the ice cave area per acre will be 5-6 square meters. Pull out the ice cubes in time.
Second, inject new oxygen into the water. During the winter, when oxygen deficiency occurs in the fingerling pool due to lack of water, diversion can be directly introduced into the pool. When the fish pond is filled with fresh water, it should be as short as possible and with a small amount of water. Note that the temperature difference between the new water and the pool water should not exceed 4°C to prevent the pond fish from catching a cold.
Third, circulating water increases oxygen. The original winter pool will be pumped out and then sprayed back. This method can not only increase the oxygen in the pool water, but also discharge the harmful gas in the pond. However, care must be taken not to set off sludge on the bottom of the tank when pumping water.
Four, plant oxygenation. Maintaining a certain amount of phytoplankton in the pool of still-water overwintering species, and keeping the ice translucent, is conducive to increasing the dissolved oxygen in the pond through photosynthetic use. For overwintering pools where water quality is thin, 1.5 kg of urea and 2 kg of superphosphate should be applied per mu in the initial stage of freezing to promote the reproduction of hi-light and low-temperature flagella. However, organic fertilizers cannot be applied to avoid polluting the water.
Fifth, remove snow. In the snowy days, the snow on the pond's ice should be promptly removed so that the sun can shine into the fish ponds, and the green plants in the ponds can normally perform photosynthesis and release oxygen.
Six, inflatable oxygen. Use a low pressure blower, air compressor, etc. to directly inflate oxygen in the pool water.
VII. Strengthen oxygenation. Use oxygen aerators or oxygen jets to intensify oxygenation to the pool water. If it is found that the overwintering fish species is in anoxic condition, oxygen cylinders can be used to directly send pure oxygen through the hoses to the water under the ice, allowing it to gradually diffuse, and supplement oxygen and increase salvation.
Eight, adding oxygen. Regular amount of quicklime, bleaching powder, etc. are put into the pond to increase the dissolved oxygen in the pool water and play a role in purifying the water quality.
Nine, chemical oxygenation. The use of chemical oxygen activators such as ammonium bisulfite, calcium peroxide, or hydrogen peroxide to increase the amount of dissolved oxygen in water is a rapid and highly efficient oxygenation method. The amount of calcium disulfate used was 10 mg/l, ie 10 g/m3, which is harmless to fish. Calcium peroxide and hydrogen peroxide can increase oxygen by 1-2 mg/L in 10-20 mg/L of water per cubic meter of water. However, do not use too much, so as not to harm the fish body. Due to the high cost of chemical oxygenation agents, they are generally used when rescuing fish floating heads.
Because of the low water level in winter fish ponds, the amount of dissolved oxygen in water after freezing by ice and snow is easily exhausted earlier, resulting in the death of overwintering fish species. Therefore, winter fish ponds need to take measures to artificially increase oxygen. Here are some ways to introduce: