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1. Refurbish the fish pond. The ponds with poor conditions must be transformed to make small ponds, shallow ponds, and dead pools become large ponds, deep ponds, and living ponds suitable for the wintering growth of fish species. Even if the pond is in good condition, necessary maintenance must be carried out to dry the pool water. After sun exposure or freezing, remove excess silt and keep only 15 to 20 centimeters thick silt, remove weeds, and reinforce the pool.
2. Clear pond fertilization. Commonly used clear pond drugs mainly include quicklime, bleaching powder and so on. The quicklime effect is the best. It not only effectively kills pathogenic microorganisms, but also increases calcium in the pool. Disinfection should be done on a sunny day, let go of excess water in the pool, keep the water depth in the pond 5 to 10 cm, calculate the amount of lime used by lime 120 to 150 kg per mu, and spread it evenly, stir it thoroughly, and thoroughly sterilize it. disinfection. Disinfection 5 to 7 days after drug volatilization, will fill the pool water, per acre applied 150 to 200 kilograms of decomposed human dung as base fertilizer, rapid fertilization of water quality, increase the biological bait in the water.
3. Select fish species. Winter fish species must be selected from species with similar age, uniform specifications, robust physique, complete scales, non-destructive fins, thick back muscles, bright color, lively swimmers, and body lengths greater than 12 cm. Before entering the pool, fish must be soaked with 2% to 3% saline or 3% to 5% bleach for 15 minutes to kill pathogenic microorganisms on the surface. Conditional fish farms can also be used to immunize the herring and grasses with an "inactivated vaccine for bleeding disease." Injecting 0.5 ml per tail at more than 18 cm and 0.3 ml per tail at less than 18 cm can effectively control the epidemic of hemorrhage.
4. Clever breeds. According to the water quality, depth and bait levels of fish farming waters, determine the appropriate stocking species and stocking capacity. For more grass feed can raise more squid, pond water fertilizer can be more flowering white quail, the bottom of the bait can be more than eel, squid. The specific matching ratio is: eat fish and flower peony by fertilizer ponds 20% to 30%: 70% to 80%, general waters 25% to 45%: 55% to 75%, flowing water or ample pond 60% to 80% : 20% to 40%; the ratio of middle and lower layers of fish is 55% to 65%, 35% to 45%.
5. Strengthen management. In winter and spring, the temperature is low, and the management of fish species should be focused on the “four preventionsâ€: the first is to prevent the shallow waters of the ponds from being frozen; the second is to prevent the feeding of water to pollute the water quality; the third is to prevent the icing and oxygen deficiency from causing the fish to suffocate; Plankton blooms cause flooding. Especially for frostbite prevention and control is very important, when the water temperature drops to 1 °C, the fish enters a paralyzed state and falls below -3 °C below zero, grass, cockroaches, squid, etc. will freeze to death, should deepen the pool water or take it above the pond. Plastic sheds and other methods of insulation and antifreeze.
As the saying goes: "The fish in winter is three minutes long." Practice has proved that the winter solstice to the beginning of the spring is the best time to put fish species. During this period, the fish species are strong, with tight fish scales, strong adaptability, combined with low water temperature, weak fish activity, and high survival rate in the fishing and stocking process. The troubles caused by wintering in Tangtang have made it easier for fish species to be evacuated earlier, which is very conducive to early spring growth. But how can we improve the survival rate of winter fish?