First, enhance the body composition of overwintering fish, improve their cold-resistance and disease resistance. Strengthen feeding and management before winter, increase fish fat accumulation, and increase fish's fullness. After the fall of water temperature in the fall, seize the opportunity to feed fat-containing foods with high sugar content for fattening purposes. The experience of overwintering in the past has proved that the survival rate of wintering fish is high when the fish is of high constitution and fullness, while the survival rate of wintering fish is generally low when the constitution is weak and the plumpness is small. To ensure safe wintering of fish, it is necessary to select and cultivate some hardy species, such as some hybrid varieties. Second, a reasonable arrangement of fish overwintering density of fish under the ice winter, the need for a certain amount of water environment and dissolved oxygen, if the overwintering fish density is too large, it will cause lack of oxygen and even suffocation death. When the water temperature is 2°C to 4°C and the dissolved oxygen is 1 mg per liter, the fish will have trouble breathing. Overstocking occurs, and once severe hypoxia occurs, a large number of deaths are likely to occur, resulting in losses. It is also unfavorable for the physiological mechanism of the fish to be in an oxygen-deficient environment for a long period of time. In addition, excessive stocking density may also cause the spread of fish diseases. Third, timely feeding, fertilization water quality winter fertility required to ensure oxygen. According to the water quality conditions, the decomposed poultry manure can be used as a fertilizer to cultivate algae and other phytoplankton, so as to enhance the oxygen-generating function of the wintering pond water. During the winter, the feed can be fed properly in good weather to ensure the water body fatness. 4. During the winter when new water is added at the appropriate time, new water should be added at a proper time to ensure sufficient water and dissolved oxygen. When the water quality is turbid or dark brown or even accompanied by stench, it is a precursor to deterioration of water quality due to deterioration of water quality. In this case, new water must be injected in time to dissolve dissolved oxygen in the water and reduce the concentration of toxic substances. The new water is usually filled every 20 days to 30 days. The amount of water injected depends on the dissolved oxygen in the water. V. Prevention and control of diseases during wintering First of all, 100 kg of quicklime per acre can be used to dry clear ponds in the wintering pond to kill pathogens and wild fish. Care must be taken when catching overwintering fish to avoid injuring fish. For fish transferred from Qingchi, cages need to be trapped for 1 day or 1 night in a clear water tank. The overwintering fish can be made into a syrup with a mixture of 3 parts of “trichlorphonâ€, 5 parts of copper sulfate, and 2 parts of ferrous sulfate before entering the wintering pond, and soaked for 1 minute. In addition, fish disease was found to be promptly treated. Treatment can use a mixture of copper sulfate and potassium permanganate 5:2, so that the pool of water showed a low concentration of 0.3ppm ~ 0.4ppm. About 24 hours to 38 hours can kill the more harmful parasites.
Dehydrated Vegetables
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