In December, with the sudden drop in water temperature, the fish began to enter the wintering period. To this end, conscientiously doing a good job of fish and pond work is the key to raising the survival rate of the fingerlings. So what are the benefits of ponds? One can learn about the production of fingerlings through ponds, the second one can provide the basis for stocking, and the third one can renovate some of the vacated fingerlings, and the fourth can make use of fish seed farms to cultivate fish in the winter to improve the utilization rate of fish seedlings. Ponds should put the following types of technologies: 1. Select and repair overwintering fish farms The requirements for overwintering fish farms are as follows: 1. Avoiding the sun, which will help improve the water temperature and reduce the thickness of the ice layer; 2. The fish farm area is not less than 2 mu, preferably 4-5 mu; 3. The dike is strong and has good water retention performance. 4. Easy water intake and drainage, good water source, easy water intake, water storage above 2.0 meters; 5. Transportation, electricity, patrol, feeding, easy to manage. After the selection of the overwintering site, the disinfection should be promptly adjusted, dry clearance, 150-200 kg of lime per acre, 1.5 meters of water after 2-3 days, 200 kg of organic fertilizer per acre, fertilization, or use of chemical fertilizers (good weather , water temperature above 13 degrees). 2. Do a good job of feeding before the pond to enhance the wintering ability of the fish In order to make full use of the suitable period of water temperature before the winter, the fish species have the strong physiological characteristics of ingesting and accumulating fat in order to prepare for overwintering, and it is necessary to insist on feeding the feed in order to keep the weight of the fish body and reserve enough wintering nutrients. Improve the survival rate of fingerlings. The daily feed is 0.5%-0.8% of the fish species weight, and it can also be fed once in 3-5 days. When the water temperature is below 6 degrees, feed is stopped. 3. During the operation of catching and transporting, human operations are lessened. During the course of pulling and handling the fish, the operation must be skillful to prevent the fish body from being injured and the large area infected with water mold after falling scales. A cumulative weight of not more than 15 kg to prevent crushing their internal organs. Before the fish species are shipped, they must be stimulated by the "draw net" intensive environment to increase the survival rate. The suitable water temperature for catching, transporting, transferring and stocking of fish species is about 15 degrees. The stock for wintering species is 500-600 kg and must not exceed 700 kg/mu. If there is a stocking plan, large-scale and robust systems will be selected and put into the water of adult fish farming. This will not only sparse the density of fish species and reduce the loss of overwintering, but also enable fish species to adapt to the environment of adult fish farming in advance. On the contrary, the growth period is prolonged and the foundation for the high yield of adult fish is laid. After the pond, the fish species must be cultivated in winter for a single pond.
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