Techniques of Fish Culture in Paddy Field in Winter

Raising fish in winter idle rice fields can not only improve the utilization rate of rice fields, but also increase the economic income of farmers, reduce diseases and insect pests of grain seedlings, and reduce the expenditure of pesticides and chemical fertilizers in the coming year. In addition, when planting grain seedlings in spring, no tillage can be achieved, labor can be saved, and a bumper harvest of rice and fish can be obtained. through rice field engineering transformation, scientific stocking and management, the yield of commercial fish per mu can be 150,200kg, the net profit per mu is about 800yuan, and the ratio of input to output is 1:2. Good economic and ecological benefits can be obtained. In this paper, the technique of fish culture in winter idle rice field is introduced. (1) the choice of rice field. Choose paddy fields with sufficient water sources, fresh water quality and convenient drainage and irrigation. (2) Paddy field engineering construction. After the rice is harvested, the rice field is returned to the field for fish feed and fertilizer. The ridge of the field is increased by 1 meter with the soil around the original field, so that the width of the base of the ridge is 50 cm, the width of the top is 30 cm, and the diameter of the inlet is 15 cm. At the outlet, the flood outlet is made of steel mesh smaller than that of the fish. Sprinkle and disinfect with 75 kg of raw lime water per mu of field. Rotten manure was applied as base fertilizer 150 / 250 kg per mu of rice field. (3) stocking of fish species. ① fingerling removes wild fish from the field with a small amount of quicklime or bleached sugar before stocking, and then irrigates to 50 centimeters. When filling, tie the 40-mesh mesh bag to the plastic pipe at the inlet to filter the water to prevent the wild fish from living in the field. Before giving up, ② fingerling was soaked in 23% salt water for 10 minutes, and the stocking capacity was 300 fish / mu, including 90 grass carp weighing 100g, 10 silver carp weighing SD grams, 180carp with body waste of 10cm, strong physique, complete scales, disease-free and injury-free. ③ stocking time: the stocking time of fish fingerling is from the beginning of October to the middle of October, about 5 days after water storage in paddy fields (after disinfection, the feet can be carried out. (4) planting of ryegrass. To plant ryegrass on the ridge and on the open land at the edge of the field, the recommended area is 10% of the paddy field area, and the recommended yield is 5 tons for grass carp. Fish and rice fields are equipped with 0.6 mu of recommended fields or land per mu. Sow Xingen ryegrass in suitable weather at the end of September or early October, using 3 kg of seeds per mu. Fertilizing ryegrass three days before harvesting ryegrass can shorten the time of two harvests and increase the yield of ryegrass. (5) feeding and management. Fish fry generally do not feed in the first week, carp can eat plankton, organic debris and lost rice in the field, and grass carp can eat rice leaves. A week later, feed 5% of the body weight of grass carp with cornmeal and love to teach, and 40% of the weight of grass carp with green vegetable leaves. After ryegrass can be harvested in November, grass carp mainly invest in ryegrass and 2% pellet feed every day from November to December. From January to February, the water temperature gradually picked up, and the food intake of fish gradually increased. 5% of the pellets were fed with clear feed every day to the degree that it was not left the next morning. (6) daily management. Just put the fish seed when irrigating 30 centimeters, so that the rice can emerge and grow for grass carp to eat. According to the growth of ratooning rice and the feeding of fish, the water level was gradually deepened. The water level deepened to more than 60 centimeters in November. The daily feed intake is 3% of the fish's body weight, once in the morning and once in the afternoon. After entering December, as the weather gets colder and colder, the bait is changed to every eight times, and the lunar leather is still carried out at noon every day on the principle that there is no leftover after eating, and the daily feed intake is 12% of the body weight of the fish. Feed is not allowed after entering the winter. However, it is still necessary to feed grass every day to maintain a stable appetite of grass carp. After the Beginning of Spring in February, with the weather getting warmer and warmer, the feeding of grass gradually increased. Formula feed can be properly fed after March, with a daily feed amount of 1 Mel 3%. After the end of March, fish enter a large growth period, and the feeding amount of grass carp needs to be properly controlled to the extent that grass carp can get 80% full. excessive feeding will cause fish diseases such as grass carp enteritis. Every morning and evening, we should go to the edge of the field to check the activity of the fish to avoid the death of floating head due to lack of oxygen and timely detection of fish disease. (7) Prevention and treatment of fish disease. During the period of weight cultivation in winter idle paddy field, the time of low temperature is longer and the disease is less. In early November, bleach, nitrogen dioxide and other disinfectants were used for prevention and disinfection, and regularly mixed or soaked in pellet feed and grass, such as garlic, rhubarb, oxytetracycline and other drugs to achieve the purpose of comprehensive disease prevention. (8) harvest. Before planting in one night, the fish will be caught on the market, and the net yield will be about 200 kg per mu of rice field. After fishing, the rice field does not need to be ploughed, but can be planted overnight.