In winter and leisure fish farming, rice is grown in the paddy field before the rice grows in the late rice field and grows until the early spring of the next year. It is usually to raise fish and fish. Winter rice paddy field has long time accumulation of water, plankton rich, there are grains, grass seeds and other residues, can become a good food for fish, it is suitable for fish farming. The use of winter free field fish culture can cultivate large-scale fish species for ponds and reservoirs, remove field weeds, eat pests, increase organic fertilizer in soil, and have low investment and high economic benefits. The first year of stocking in November, and harvesting in May of the following year, the average yield of fresh fish can be more than 25 kg. The main technical measures for winter fish farming are as follows: First, choose a good winter farm. Generally, we should choose winter fields with abundant water, abundant sunshine, convenient drainage and irrigation. After harvesting single-season or late-season rice, we need to plow up the soil and raise the earthworm 60-80 centimeters immediately to prevent water leakage and keep water at 50 centimeters. about. Liquor must be disinfected with quick lime before stocking. Use 25 kg of lime per acre. After the toxicity of lime disappears, add water and keep the water temperature at 15-25°C. Second, dig a fish pit and set up a fish shed. In winter, fish farming in the field is slower due to the cold weather and low water temperature. For safe wintering, on the sheltered side of rice fields, a 10-millimeter pit is to be dug, 50-70 cm deep. Put a shelter on the fish pit, covered with straw or branches to keep warm. Under the shed, pigs, cow dung and other fertilizers were used as bait. It can increase the temperature of water and it is also conducive to the growth of fish. Third, the impoundment of water, fertilization water quality. Before the fish is introduced into the fields, it is necessary to apply sufficient basal fertilizer to fertilize the water quality so that the fish species can live in winter in the fertilizer water. In general, 5% to 10% of pigs or cow dung should be used per mu, or 3-5% of human excrement. Fourth, fish stocking, reasonable "close planting." In winter, free-range fish farming is to be polycultured, mainly by carp, supplemented by fish such as grass carp, carp, and silver carp. Generally about 400 stocking species per mu. If there are not enough fish species, it is also possible to raise a few species individually or less. Fifth, meticulously reared and strengthened management. Fish is a temperature-changing animal. Water production below 12°C produces slowly, and growth stops below 5°C. Therefore, to achieve the amount of feeding before the Spring Festival from more to less, after the Spring Festival from less to more. To do timely and appropriate. At the same time, it is necessary to carry out inspections and inspections of fishing facilities, constantly observe the activities of water color, water level, and fish, remove remaining residues and other corrupt materials, and add new water in a timely manner to maintain a certain water level. Six, prevention and treatment of fish diseases. In winter, the water temperature is low, and there are fewer fish diseases, mainly fishy mildew. Control methods: Before the fishes are planted in the fields, the fish body is soaked and sterilized with 5% salt water. The leaching time is generally 10-20 minutes.
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