Rice field farming shrimp technology
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March 16 21:11:51, 2019
The scientific name of Japanese shrimp, Macrobrachium praecox, is one of the important breeds of freshwater prawn. It has the characteristics of complex feeding, strong fertility, wide adaptability, short breeding cycle, and high market price. The cultivation of green shrimp in paddy fields is the best use of rice field resources. The systematic project to improve the ecological benefits and economic benefits of rice fields has the characteristics of less investment, quick results, and large profits. It is an important way to revitalize the rural economy and guide farmers to become rich. 1 Paddy field construction 1.1 Paddy field selection. Select paddy fields with sufficient water sources, good water quality, no pollution, and convenient irrigation and drainage, the area may vary, generally 2000-7000m2 is appropriate, the bottom quality requirements are fertile, and the water retention performance is good. 1.2 Field project construction. Including ring ditch, field ditch and holding pool. The ring ditch is the main site for the activities of the shrimp, and it is required to excavate along the inner side of the field and require a ditch width of 4m and a depth of 1m. The field ditch is connected with ring ditch and paddy field, and depending on the size of the field block, it is dug into a horizontal ditch or "10" or "well" ditch. The ditch is 1m wide and 1m deep. The holding pool is used for cultivating juvenile shrimp, raising shrimp species and harvesting commercial shrimp. The specification is 10 m4m1m and is located in front of the outfall of rice fields. The above three parts account for about 15% of the rice field area. The earthwork of the project construction is about 300m 3 to widen the field rake 1-2m and increase the height by 0.5-1m. The foundation of the inlet and outlet shall be compacted, 0.5m wide, and sealed with tight-gauge wire mesh. The Yifan area should also dig two flood discharge gaps and require the same inlet and outlet. 2 Stocking of shrimp 2.1 Preparation before stocking. 15 days before stocking, thoroughly clear the pond with clear lime, kill wild fish and harmful bacteria, inject 7 days after disinfection, inject 0.5m deep water, fertilize the pig manure 600kg per mu, and fertilize water quality; in order to favor the habitat of the green shrimp, At the bottom of the shrimp ditch, submerged plants such as Hydrilla verticillata and Malay Oozi are transferred, which accounts for about 1/3 of the area of ​​the shrimp ditch. 2.2 Shrimp stocking. There are two kinds of stocking methods. One is to raise shrimp seedlings that have been cultivated directly. The specifications for breeding from June to July are 1.5cm or more, and 20,000 stocks are kept per acre. One is to hold the eggs of shrimps, which is generally held in the 4-5 months of stocking size 4-8cm of holding eggs shrimp, stocking 0.25-0.5kg per acre, after more than a month of cultivation, can also be bred into 1.5cm shrimp more than 20,000 tails. 3 Feed Management 3.1 Feed Feeding. In the early stage of the shrimp pond, in addition to maintaining the water's fatness to cultivate aquatic organisms, it is also necessary to feed enough concentrated feed, such as rice bran, wheat bran, etc., or directly feed special feed for giant shrimp, with a protein content of more than 30%. Green shrimp grow faster. From July to October can be used with some vegetable feed. In October, some animal feeds were started. They were fed twice a day. They were fed at 8 a.m. and 6 p.m. each time. Since the shrimps had habits of nocturnal emission, they were fed in the afternoon at the rate of 70. %, daily feed is 3%-8% of shrimp body weight. 3.2 Water Quality Management. The growth of fresh shrimp requires fresh water and adequate dissolved oxygen. Therefore, special attention should be paid to adjusting water quality. In hot summer season, change the water once a week. Change water 1/3 each time. If you find water quality is too thick or rainy days, you should flush water in time. . 3.3 daily management. The first is to inspect the field every day, check whether the barbed wire at the inlet and outlet is firm, observe the changes in water quality in the ditch, and remove frogs, leeches, and other predators. Second, rice cultivation is carried out according to conventional methods, but it should be noted that the green shrimp are particularly sensitive to pesticides. Special attention must be paid to rice when using pesticides. The concentration of pesticides and fishery drugs should be strictly controlled, and the correct method of application should be adopted to ensure the safety of the shrimp. 4 Green Pelagic Fishing Green Pelagic fishing is usually done by catching large fish and catching small fish. First half of the ditch water is drained, and then shrimp shrimp with a net of 4 cm or more is harvested and fished. After 4 cm, the rearing of the shrimp is continued or the seedlings are transferred to the field as seedlings. Restocking.