Crayfish rice field culture refers to the use of rice fields as potential waters for crayfish culture. 1. The conditions for shrimp culture in rice fields are fields with good water quality, sufficient water, no pollution sources around, strong water retention capacity, convenient irrigation and drainage, and no flooding in shrimp culture in rice fields, ranging from several acres to dozens and hundreds of acres. Shrimp ditches should be dug around the inside of the rice field ridge, with the width of 1. 5 m, depth 1m, if the field area is large, a field ditch should be dug in the middle of the field, with a width of 1m and a depth of 0.5 m. The area of shrimp-raising ditch and field ditch accounts for about 20% of the total rice field area. Reinforce and raise the ridge of the field with the soil dug out from the shrimp ditch to level the field surface. When strengthening the ridge, each layer of soil should be compacted to prevent the ridge from collapsing in the next storm. The width of the ridge is more than 3 meters, and the height of the ridge is 1 meter. The entrances and exits should be enclosed with barbed wire or fences to prevent crayfish from escaping and the enemy from entering. The water inlet channel is built on the ridge, and the water outlet is built at the lowest part of the shrimp ditch. According to the pattern of high irrigation and low drainage, ensure irrigation and drainage. At a distance of 0/m from the ridge/kloc-0, a pile with a height of 1 .5 m is drilled every 3 meters, which is erected with bamboo, and there are melons, beans and gourds. Planted on the edge of the ridge. After the vines are put on the shelves, they will play the role of shading the sun and cooling off the heat in hot summer. Aquatic plants, such as Sophora alopecuroides, Haematococcus verticillata, Ceratophyllum japonicum and other submerged plants, should be transplanted in shrimp ditches and ridges, and the coverage of aquatic plants should be 30%, especially scattered and scattered, which is beneficial to the smooth flow of water in shrimp ditches. Build an escape wall around the site with plastic film, cement board, asbestos tile or calcium plastic board to prevent crayfish from escaping. Second, when stocking crayfish larvae or shrimp species, the larvae and shrimp species should be tested. After testing the water safely, the shrimp can be released. There are two ways to raise crayfish: First, in the first ten days of September after rice harvest, the shrimps are directly put into the rice fields and allowed to breed by themselves. According to the actual situation of rice field culture, generally, 20 kilograms of crayfish with individuals over 40 grams are cultured per mu, and the sex ratio is 3: 1. Second, after transplanting in May, put 1500-2000 larvae/mu or 30 kg/mu, with the size of 2-4 cm. When stocking crayfish, attention should be paid to the quality of young shrimps, and the stocking specifications in the same field should be as neat as possible, and all crayfish should be stocked at one time. Stocking in sunny morning or rainy day, using 3% ~ 4% salt water bath for disinfection 10 minute when raising shrimp, carefully disinfecting seeds and seedlings in high temperature weather, and it is best not to use salt water bath when entering seedlings, and using 10 kg/mu quicklime for disinfection water after entering seedlings. Third, daily management insists on field inspection every morning and evening to observe the change of water color, shrimp activities, eating and growth in the ditch. Field management is mainly about drying rice fields, using drugs and preventing escape and harm. Rice should be lightly roasted in the sun, and the water in the field can't be completely drained. The water level can be lowered to the surface of the field for a short time. If the crayfish are found to have abnormal reaction, water should be injected immediately. Crayfish are very sensitive to many pesticides. The principle of shrimp culture in rice field is to use it resolutely when not in use, and use high-efficiency and low-toxicity pesticides and biological agents when necessary. When applying pesticides, we should pay attention to strictly controlling the safe use concentration of pesticides to ensure the safety of shrimp. We should try to spray pesticides on rice leaves, and it is best to use them in different regions. To control rice borers, spray 200ml of 18% insecticide and 75kg of water per mu; In order to control rice planthopper, 50 grams of 25% chlorpyrifos wettable powder and 25 kilograms of water were sprayed per mu; To prevent and control rice stripe disease and rice blast, 40 grams of 50% bactericide should be sprayed per mu; In order to control rice sheath blight and false smut, 250 ml of synergistic jinggangmycin was sprayed per mu. When applying pesticides to rice, we should try to avoid using pesticides containing pyrethroids, so as not to harm Procambarus clarkii. Spraying water solution should be carried out in the afternoon, because the rice leaves are dry in the afternoon, and most of the liquid medicine is adsorbed on the rice. At the same time, add water to 20 cm in the field before application, and change the water in time after application. Four. The basic fertilizer for feeding and managing crayfish in rice fields should be sufficient, and the decomposed organic fertilizer should be mainly applied to the plough layer before transplanting to achieve the purpose of lasting fertility. Topdressing is usually once a month, with urea 5 kg/mu, compound fertilizer 10 kg/mu, or applying organic fertilizer. It is forbidden to use ammonia water, ammonium bicarbonate and other fertilizers harmful to crayfish. When topdressing, it is best to drain the shallow field water first, let the shrimp concentrate in the ring ditch and the field ditch, and then apply fertilizer, so that the chemical fertilizer can be quickly deposited in the bottom field mud and absorbed by the field mud and rice, and then deepen the field water to the normal depth. Shrimp farming in rice fields generally does not require feeding. In the peak season of crayfish growth, some animal feed, such as crushed snails, mussels and leftovers from slaughterhouses, can be properly fed. From August to September, plant feed is the main feed, and more animal feed is fed in June from 5438+00-February 12. The daily feeding amount is 6% ~ 8% of the shrimp weight. Feed 1 time every 3-5 days in winter, and the daily feeding amount is 2% ~ 3% of the shrimp weight in the field. From April of the following year, the feeding amount was gradually increased. Water quality management in hot season from August to September, changing water every 10 day 1 time, changing water every time1/3; Spray quicklime water 1 time every 20 days to adjust the water quality. Daily management visits the site once a day. Do a good job in flood control and escape prevention. More aquatic plants are raised in the shrimp ditch, and the quantity is insufficient to be replenished in time. Don't flush or interfere when shrimps molt a lot. Feed high-quality animal feed after molting. Five, commercial shrimp fishing. When crayfish are raised in rice fields, as long as enough shrimp species are put in at one time, after two months of breeding, some crayfish can meet the commodity specifications. Long-term fishing is an important measure to reduce costs and increase production. Crawfish that meet the commodity specifications will be caught and sold on the market, and those that do not meet the specifications will continue to be cultured in rice fields, reducing the density of crayfish in rice fields and promoting the rapid growth of small-sized crayfish. From mid-May to mid-July, shrimp cages and ground cages were used for fishing, and the effect was good. You can also copy the net back and forth in the shrimp ditch, and finally dry the water in front of the rice field to catch all the shrimp. Young shrimps are released in February and March, and the fishing peak is generally 9- 10. Cultured shrimps are released from September to June, and generally enter the fishing peak from May to June of the following year. Fishing is prohibited during the breeding season.