It is not appropriate for pond fish and pond wintering
When the temperature of the pool water in the early winter falls below 8°C, the fish basically stop feeding. At this time, it is most appropriate to carry out over-wintering in ponds. However, there are six exceptions for safe wintering of Tangchi fish: 1. Silt should not be too much. The silt in the wintering pond should not exceed 20 cm at most. Excessive sludge will deplete organic matter and consume large amounts of oxygen in the water. As a result, carbon dioxide rises sharply. When the carbon dioxide content in the water exceeds 80 mg/L, fish will have difficulty in breathing, affecting metabolism and causing extensive death. 2, pool water should not be too shallow. Overwintering ponds should be selected where there is good water retention, close to the water source, and water quality should not be contaminated. The depth of the pool water should be 2-3 cm. The water in the pool is too shallow to keep warm, the water temperature is low, and the fish is vulnerable to freezing. In addition, fertilizers containing suspended matter can be injected into the pool before wintering, or organic fertilizers can be used to grow phytoplankton in advance in the pool to promote photosynthesis and increase dissolved oxygen in the pool. 3, and ponds should not be too early. It is too early for the pond to overwinter, the water temperature is too high for the fish to swim actively, and the fish is easily injured when the net is pulled. In addition, some fish have not stopped feeding. If they are put into the wintering pool too early, they will not be able to eat. The physical consumption will also affect the winter. However, ponds should not be too late, too late the water temperature is too low, the fish body easily frostbite. The specific time may vary from place to place, and it is generally appropriate to control the water temperature down to about 8°C. 4, the density should not be too high. The stocking densities for overwintering fish ponds should be based on specific conditions such as dissolved oxygen in water, size of water surface, size of fish, type of fish, and management measures. For ponds with good water retention capacity, the average acre is about 20-300,000 fish species about 10 centimeters, or about 2.5-3.5 kilograms of broodstock is about 80 fish (the winter water pool can be increased by 1 times), New Year's Day, Spring Festival The listed commercial fish can be stored at 600-800 kg. 5, squid should not put more. The carp is active, strong in resistance, and lives in the bottom of the pool, often turning mud in the bottom of the pool, making the pool water turbid, not conducive to photosynthesis of phytoplankton, reducing the source of oxygen in the water, and making other fish unquiet. It is best that wintering squid is stocked separately so as not to affect other fish, especially fish ponds. If you really need to go with stocking, the percentage must be controlled below 10%. 6, management should not relax. Many people believe that after the ponds, fish are basically not fed, and there is no need to control the fish. As everyone knows, the management during the wintering period is very important, not only to regularly check the water quality, water color and fish activity, inject new water every two weeks or so, but also pay special attention to the regular determination of dissolved oxygen, when the dissolved oxygen in the water is lower than When taking 3 milligrams per liter, oxygenation measures must be taken immediately to prevent the fish from being alerted, and to prevent the fish from being snarled after being frightened, consume physical energy, and increase oxygen consumption. When the weather is warm and the water temperature rises above 8°C, the fingerling ponds and broodstock ponds should also be fed with a small amount of fine material, and the feeding amount should be 1-2% of the fish body weight. When the water is frozen, it is necessary to play ice-eye ventilation to prevent fish from dying and suffocating.
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