Winter free-range fish farming generally starts from the harvest of late rice until May of the following year, and lasts for more than 7 months. Now more than three months have passed, some time ago experienced the test of cold weather, the county's winter fish farm situation is still good, from the aquaculture area, the general mountain village has more than 10 acres, more than 40-50 acres Estimated that the county has about 7000 acres, an area slightly increased over the previous year; from the feeding situation, the number of stocking species is generally 20-30 kg per mu, more than 1-200 kg, feeding more common fertilizer, some support Households also installed plastic nets to prevent bird damage; some also increased the height of field ridges, open fields in the fields, scaffolding, soil plowing, and relatively complete field engineering facilities. However, some farmer households have extensive management and low stocking densities. They don’t feed bait, they are shallow, and they have large losses. It is difficult for fish farming in winter to be effective. In order to raise the level of fish farming in winter and leisure fields, it will be a good start for the development of fish farming in rice fields in the next year. Now the following technical measures are put forward according to the status of fish farming in the previous stage for reference by the majority of raising families. First, ensure the safety of water sources. With more rain in the near future, various localities must use favorable opportunities to deepen the water level and strive to reach 0.5 to 0.7 meters, which should not be too shallow. At the same time, it is necessary to prevent harmful toxic substances from flowing into Daejeon. Affects fish growth. Fish is a temperature-changing animal. It is very important to control the temperature of the water. It is still in the winter season and the weather is cold. Try to keep the water temperature as good as possible. If the weather is fine, you can lower the water level to warm the field water, deepen the field water at night, and keep warm. Usually pay attention to the stability of the water level and reduce the stress response of the fish. Always pay attention to the safety of Tanaka's shady shed. If it is damaged, repair it in time. Water quality management is a very important task. If you want to raise water, you need to change the new water in time. After the spring, the water temperature rises, the natural food and fish in the water grow rapidly, the water quality management work must keep up, the general water change time can be controlled in about 20 days, and at the same time, according to the change of water quality, lime can be applied from time to time. 15kg, if using photosynthetic bacteria alternately, it is better. Second, pay attention to feeding fertilizer. The general principle of feeding is to invest more in the early period, less in the medium term, and more in the later period. At present, it is in the middle period. The temperature is still low before and after the Spring Festival. The food intake of the fish is not large. The feeding rate should be controlled between 0.5% and 1% during the January-February period, and the water temperature should increase between March and March. The daily feeding rate should be 1-2. % According to the principles of "Four Dedications" and "Three Looks", it is flexible. The purpose of fertilization, first, play a role in fertilizing the water quality, the second is to make fertilizer into fish bait for fish feeding. There are two methods of fertilization: First, composting. If you already have compost piled in the field to check fertilizer fermentation, if the amount of compost is not enough, you need to increase the amount of compost, and you can control about 500-1000kg per mu, and on top of the heap. Cover the straw and apply the mud to make the fertilizer ferment naturally. After spring, as the water temperature rises, the compost should not be too much, so as not to spoil the water quality. The second is the application of fermented organic fertilizer, the method is that when the water temperature is higher than 10 °C, it can be applied organic fertilizer from time to time to facilitate the development of water quality, depending on the amount of water quality. Third, prevent bird damage. In recent years, the frequent occurrence of bird-eating accidents has become a major public hazard affecting the development of fish farming in rice fields. At present, there are prevention methods, some deepen the field water, some keep the water on the water, and some install anti-bird nets in the fields. There are various methods. Farmers can choose according to the actual situation. Although the method of installing anti-bird nets is good, it is still not universal. The main reason is that peasant households have not tasted the sweetness of fish breeding in winter and field. However, the cost of installing anti-bird nets is too large to be considered cost-effective. Based on this situation, it is recommended that pilot projects be carried out by key household sample households, and that they can also be promoted after gaining experience. The county fishery authorities should provide support in terms of input to promote the smooth development of fish farming in winter and field farming. Fourth, prevent disease. In the earlier period, the weather was cold and the disease was relatively small. As spring approaches, the water temperature rises and the disease develops. All localities must do preventive work as early as possible. Regular methods of lime application, bait injection, and diligent inspections can be used. If brucellosis, small melon worm disease, gill rot disease, anchor head lice and other diseases are to be treated with symptomatic treatment, ensure healthy culture. Fifth, flutter and stay small. With the Spring Festival approaching, the demand for aquatic products in the market has soared. Any product that meets the specifications must be launched in time to obtain the best economic benefits. Cnc Dental Milling Machine,Metal Dental Milling Machine,Dental Crown Milling Machine,Ceramic Dental Milling Machin Shandong Carved Intelligent Technology Group Co.,Ltd , https://www.demetdent.com