Green shrimp often live in rivers, lakes, reservoirs, ponds and other freshwater waters. It is a new breed of pond culture that is currently advancing the adjustment of industrial structure. In 2001, Gushi County, Henan Province, raised 2,000 mu of freshwater shrimp and used three-dimensional breeding techniques. It has achieved very good results, so that the majority of farmers have obtained considerable benefits in the year. In 2002, the number of shrimp farmers in the county was greatly increased, which promoted the adjustment of the industrial structure. In this regard, we have summarized the experiences summarized in practice as follows: 1. Pond Preparation 1. Shrimp tank selection; Qingpen pond selection of good ventilation performance, adequate water supply, drainage and irrigation facilities and water pollution-free ponds. 2. Shrimp pond area: generally about 5 acres is good, shrimp pond slope ratio is generally 1:2.5-3; depth is 1.2-1.5m; flat bottom, mud requirements below 10cm. 3. Inlet and outlet facilities: 40 mesh and 60 mesh screen meshes at the inlet of shrimp ponds are used to filter influent water, while drain outlets are sealed with dense mesh or wire mesh to prevent shrimps from escaping. 4. A 1.5kw aerator is fitted to each shrimp pond. Second, weed cultivation and mesh setting This is a key measure for the three-dimensional culture of green shrimp. We have set a certain area in the middle of the shrimp ponds, in addition to planting a certain area of ​​aquatic plants in accordance with the biological characteristics of the shrimp. Summer flower mesh to increase the habitat of fresh shrimp, the specific approach is: 1. Transplanting water plants: Water plants such as peanuts, water spinach and water lilies are planted around the ponds in the shallow water zone 1m away from the pond. The grass has a width of about 1m, and the area accounts for 10% to 20% of the surface of the pond. When aquatic plants grow vigorously in summer, they must be properly controlled for removal. The first thing to cultivate aquatic plants is to create a good habitat and a hidden place for the shrimps to avoid mutual food. The second is to reduce the temperature of the water in the hot season and avoid direct sunlight, which is conducive to the growth of shrimp. The third is to make the pool water fresh and stable, adequate dissolved oxygen, and control the floating head of the shrimp. The fourth is to make full use of the pond space to provide fresh plant food. 2. Mesh setting: In the middle of the pond, a double or single layer of mesh is used to build a row or two rows of inhabitants, and the bamboo frame is fixed in a “^†shape, accounting for about 25% of the total area of ​​the pond. The distance between two layers of mesh is approximately 30cm, the upper layer of mesh grafted water spinach cover the top, so that its root system extends through the second layer of mesh, shrimp shell. Habitat and feeding provide good environmental conditions. Mesh nets are 10-33 mesh nets. Third, shrimp stocking l. Preparation: 0 days before stocking, 0 days, 75kg-100kg fresh lime pond disinfection per acre. 2. After 4 days, the clear pond began to be filled with water, the water depth was 50cm-70cm, and 150kg to 200kg of manure was applied per mu to cultivate plankton. 3. Shrimp stocking: In the middle and late June, choose a cloudy or sunny morning stocking shrimp, stocking density of 20,000 to 40,000 per mu, specifications 1.5. m above. 4. After half-a-day of stocking, the rearing and summer fish species of 55 white mulberry were raised. Fourth, feed feeding 1. Green shrimp like to eat bean cake, bran, flour, animal food more like food, screw, small trash fish, fish meal, etc., according to 30% to 40% animal food, 60% -70% vegetable food preparation Granulated feed, particle size 2mm-4mm. 2. Feeding time and quantity: Each time around 8 am and 5 pm, they were fed one time. The amount of feed in the morning accounted for 30%, the amount of feed in the afternoon accounted for 70%, and the daily feeding amount was generally controlled by the total weight of the shrimp. %-5%. 3. Feeding method: evenly put in the net in the pond, or the shallows around the pond. 4. From September to early October, freshly milled fresh snails are fed once a day, and the daily feeding amount is about 10% of the total weight of the shrimps to enhance the fattening effect. Fifth, shrimp pond management Shrimp pool water quality: The shrimp ponds need to keep fresh water, adequate dissolved oxygen, but also have a certain degree of fatness, transparency is controlled at about 40cm. Regular water injection methods are used to regulate water quality, with less water injection in the early stage, and water injection in the middle and later stages to keep the water quality fat, live, tender and cool. Appropriate application of phosphate fertilizer, promote the growth of plankton. In the summer, the injection and replacement of water can be strengthened. Each injection of water is 10-20cm. If the water quality is too fat, some of the pool water may be drained and then filled with water. 2. Eradication of the enemy is often required: Every 15 days to 20 days, shrimp ponds are splashed with quick lime 20kg/mu?m to achieve bactericidal calcium supplementation. Adjust the role of water quality. 3. Day-to-day management: Stick to the morning and evening patrols to observe shrimp eating, clam shells, growth, activities and dead shrimp, and make a good record of patrol ponds. In the hot summer, we must increase the number of patrols in the morning and evening. If we find that the side of the shrimp is on the side of the water, on the grass or on the side of the pool, it indicates that the pool water has been deprived of oxygen, and it should be filled with water or an aerator to rescue it. Sixth, the disease prevention and control of shrimp disease is stronger, less incidence, mainly to disinfection and prevention. In practice, we mainly use quicklime, which is usually applied twice every 7 days to 10 days. Each time we use 10kg/mu, the quicklime is poured into the whole pond for sprinkling. This not only sterilizes and prevents diseases, but also increases calcium in the water. Good for shrimp oysters. VII. Adult Prawns Crawling In the middle and late November of November, the shrimps can begin to be gradually listed in batches, adopting multiple rounds of catching and catching large and small measures to increase output value.
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