Pond polyculture is a good project with low investment, quick effect, high yield, and convenient source of seedlings. The main techniques for the cultivation of shrimp are described below: 1. Pre-preparation 1. Disinfection of clear ponds and fertilization The water quality is strictly controlled by conventional methods. 2, set attachments. In general, weeds are planted in shallow water areas around ponds, such as Vallisneria, Hymenocallis, and Malay Oozi. Submerged plants can be planted in shallow waters to form aquatic forests. Vegetables and other floating plants can be fixed on the water with a rope. Larger ponds need to be planted with a few aquatic plants in the middle of the pond. The area of ​​aquatic plants can generally occupy about 1/3 of the total surface area. Such an environment is very beneficial to the cultivation of shrimp. Second, seed stocking in shrimp fish or shrimp fish and crab polyculture model requires the production of shrimp per mu 20 kg, 300 kg of fish, crab more than 10 kg, and their stocking were: 1, double season shrimp. In winter and spring, the ponds will be stocked with freshly-frozen shrimp species. Each mu can be stocked with 1.5 to 3 cm of young larvae of about 10,000, and the stocking will end before the end of February; the autumn shrimp will be farmed from late June to early August, per mu. Put 2-3 million prawn seedlings with a specification of 1.5 cm. 2. One-year-old shrimp rearing, that is, stocking in the winter and spring, letting about 20,000 tails of fresh and plentiful shrimps per acre, or holding 2 to 3 kg of egg shrimp per acre before the end of May. In order to improve the survival rate of the shrimp ponds in the fish and crab ponds, the conditions should first set the cages for cages or caged shrimps in the original pond and raise them until the shrimps reach a height of 1.5 cm or more. It is very obvious that the survival rate of shrimp is improved. 3, fish stocking. In order to raise the population of white pelicans and silver maggots, banned carnivorous fish, generally about 30 kilograms per acre of aquarium species and silver bream species per acre before the end of March, such as the above-mentioned varieties of large-scale species of fish stocks are insufficient, Before the end of June of the same year, it is appropriate to add 200-300 tails per mu of summer fish species, which generally meets the listing standards at the end of the year. 4, crab species stocking. The crabs are mainly seedlings that were reared in the year of stocking, with 400 to 600 beans crabs per acre with a size of 4000/kg, or 120 to 200 beans per acre before the end of the month. Third, feeding and management 1, feeding. First, the ponds that hold egg-raising shrimps and winter-spring larvae should be fed with soya milk during the breeding season of shrimps. When the shrimps reach 1.5 cm or more, they should be fed with granular materials such as wheat bran and bean cake; secondly, the polyculture ponds are generally There is no need to feed the shrimp specifically, but in the middle and late period, animal feeds, such as mixed fish and snails, etc. should be properly fed; the third is based on the feeding characteristics and living habits of the shrimps; Feeding the bait enough, the feeding time of the shrimp should be 6 to 7 o'clock in the evening to prevent the fish from catching food. In short, the polyculture pond feeding should be based on the "four set" requirements, while ensuring that the bait is fresh, palatable and nutritious, so as to improve the survival rate and yield of the shrimp. 2, the water. Green shrimp require higher water quality, especially for dissolved oxygen. In the early stage of aquaculture, the water quality must be maintained to a certain degree, and the transparency of the pool water should be maintained at 25-30 cm. During the middle and later stages of breeding, the amount of water to be changed should be increased to keep the dissolved oxygen in the water sufficient, and the transparency of the pool water should be maintained at 30-40 cm; every 15 to 20 days per acre. Application of lime 5 to 10 kilograms, adjust the pH of the pool water and promote the growth of the shrimp. In July, August and September, fresh water should be used for groundwater treatment to remove floating grass and other debris on the surface of the pond in order to prevent oxygen depletion from causing floating of the shrimps. In addition, a certain amount of plants should be planted or moved in ponds. It not only regulates water quality but also provides a good habitat for shrimp. 3, prevent disease. The disease of shrimp culture is not serious. Usually, attention should be paid to the prevention and disinfection of drugs such as quicklime and bleaching powder to prevent and control the occurrence of diseases. Drugs should be selected to use broad-spectrum, high-efficiency, prawn, crab-free drugs, trichlorfon, B-type exterminator and other drugs may not be used. Fourth, timely fishing for juvenile shrimp stocking in winter and spring to May, it should start catching big stay and catch the small round of listing. Autumn shrimp farming should be captured from September.
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