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Pond high-yield culture method
In order to change the current situation that the yield of pond and shrimp culture is low, adopting technical measures such as double-season shrimp rearing and feeding full-grain pellet feed can achieve better aquaculture economic benefits. The main technical points are as follows. 1. Pond requirements. Prawns have high oxygen consumption and are not tolerant to hypoxia. At the same time, they are also benthic animals and have poor swimming skills. They like to move at the bottom of the pool. Therefore, the pond area for cultured green shrimp should not be too large. Generally, the pond area for shrimp farming is 3-8 acres, with a slope ratio of 1:3 to 1:3.5, a water depth of about 1.5 meters, and no silt at the bottom of the pool. The water source is non-polluting and meets the national fishery water standards. The first half of the seedlings were thoroughly cleared with quicklime and installed in each pond. 2. Plant plants. Green prawns are crustaceans with shelling and mutual disability. Therefore, in order to avoid the phenomenon of mutual disability of the green prawns, suitable plants must be planted to prevent the shrimps from interfering with each other. There are two main types of plants for water plants: one is water peanuts planted around shallow waterways near the pool; the other is submerged plants planted at the bottom of ponds with shallow water, with black-leafed black algae, Elodea, etc. Rapid, so when there are too many plants in the pond, the sparse water can be removed by artificial means, so that the distribution of aquatic plants in the pond is the best. Under normal circumstances, the proportion of watergrass growth area to the total pond surface area should be controlled at about 30%. 3. Set up the mesh. In the middle of the shrimp pond, 10 to 33 mesh unscented summer flower nets are set, fixed with a bamboo frame, and set at a height of 20 to 40 cm below the surface of the water, with a gradient of 15 to 20 degrees so that the shrimp can crawl up and down. The width of the film is 3 to 4 meters, and the length is determined by the pool. Generally, about 5 acres of ponds can have 2 rows of mesh. 4. Seed stocking. The growth rate of shrimp is fast, and the breeding cycle is short. In the case where the culture environment is appropriate and the feed is sufficient, the shrimp seedlings can reach a commercial specification of 3 grams or more per rearing after 2 months of culture. Therefore, two breeding modes of spring and summer and two-year-old breeding can be adopted. Summer stocking is conducted around July, and about 40,000 to 60,000 shrimps per acre of about 1 cm are placed on the mu, and a small amount of carp species is released after 10 to 20 days. When stocking, they must have neat specifications and a strong physique. The stocking time should be selected when the morning is sunny or when the cloudy days are not sultry, and the seedlings should avoid the peak of shelling during stocking. By the end of August-September, there will be a batch of spawning hatchlings of small shrimps. These shrimps can grow to 2 to 3 centimeters by the end of the year. They can be used as spring stocking seedlings, and usually have 30,000 to 50,000 mu. tail. 5. Feeding management. According to the feeding habits of the shrimp, adhere to the principle of feeding. Normally, it is fed twice a day for 8 to 9 hours and 5 to 7 in the morning, and the total amount is 1/3 in the morning and 2/3 in the afternoon. The bait should be thrown in a shallow area with long aquatic plants, and evenly distributed. The daily feed rate of shrimp seedlings is generally controlled at 3% to 5%, and it is mainly fed with fine-grained feeds. With the increase of individual shrimp, appropriate pellet feeds can be fed. When feeding, observe carefully the eating conditions of the shrimp. Usually, the amount of each feeding should be within 2 to 4 hours. 6. Water quality management. In the hot season, it is necessary to add water or change the water once a week, drain the bottom old water first, and add 15 to 20 cm deep new water. At night or in the early morning, the floating head of the shrimp must be found. The aerator must be opened and the new water must be filled. Especially in the weather before the sweltering heat or thunderstorm, measures should be taken to add water and change the water 24 hours a day to keep the pool water flowing. 7. Daily management. Every half month disinfect the water with quicklime or dibromohydantoin, chlorine dioxide and other disinfectants to kill pathogens and pathogens. At the same time observe whether the ciliate body attached to the green shrimp, can be used Quanchiposa copper sulfate aqueous solution, the whole pool of the concentration of 0.7ppm, every 7 days and then again. 8. Get caught at a proper time. Green shrimp grow up to 4 to 5 centimeters can be arrested and listed. General spring release seedlings from May to July from the listing, summer seedlings from September to November to catch the listing.