I. Pond conditions Shrimp ponds should have sufficient water sources, good water quality, no pollution, quality of water quality in accordance with the provisions of GB11607; the bottom of the pool is flat, there is less silt, and drainage is convenient; the area is 3-10 acres, and the optimum area is 3-5 acres. Water depth 1.8-2.5 meters; Each pond needs to be equipped with 2-3 aerators. Second, prepare before transplanting 2. Cultivate basic bait. 5 to 7 days before seedling emergence, the microbial composite preparation EM was exposed 1-1.5 kg per mu. Then, 2 days before planting, appropriate amount of urea and superphosphate are applied per acre pond so that the transparency of the pool water is 25-30 cm, and the water color is dark brown or yellow-green. 3. Adjust the water salinity. For pure freshwater ponds, 1 to 2 days before planting, cast 150-200 kg of coarse salt or sea crystal per acre, and adjust the pool water salinity to 1 ‰ to 1.5 ‰. Third, shrimp selection and stocking 2. Stocking of lamp-raising seedlings: The stocking time was selected for the first seedlings in the middle and early May, and the water temperature was stable at more than 20°C. Stocking density of 3.8-4.0 million / mu is appropriate. The second stocking density is 2.8-3.0 million mu per acre, which should not be too high, otherwise it will affect the growth and out-of-pool specifications of the second mussel. Fourth, feeding and management 2. Feed feeding. Feed selection Whitebait is a full-priced pellet feed. First of all, ensure that the feed quality is not bad and the particle size is suitable. The second is to control and adjust the amount of feed, and the daily feed is controlled by 30% to 5% of the shrimp's weight. However, in actual aquaculture production, it depends on the shrimp's feeding conditions, water quality, and temperature, and it can be done in small quantities several times. Fifth, disease prevention adheres to the principle of “prevention and health managementâ€. Every 15 to 20 days, alternately disinfect once with environmental protection drugs such as quicklime, dibromohydantoin, photosynthetic bacteria, and EM. If artificial feed is fed, then 1‰-2‰ vitamin C, immune polysaccharides, etc. are regularly added to enhance the immunity of shrimp. When the water is changed, it is not a big irrigation and the water quality is relatively stable. 6. The method of harvesting the marketed white prawns of South America is mainly trapped in the ground cage nets, and finally caught in dry ponds. Harvest time is determined according to market demand, price and growth conditions. When the South American white shrimps are bred for 70-80 days, the specifications can reach 60-90 tails/kilograms and they can be caught and kept small, harvested and marketed in batches, and finally dried up. The first shrimp will be fought in late July and early August so as not to affect the stocking and growth of the second prawns too late. Perching Stool With Wheels,Perching Stool Height Adjustable,Perching Stool With Pvc Back,Perching Stool With Pvc Padded Seat Active Life Healthcare Co.,Ltd , https://www.alh-med.com
1. Clear pond disinfection. For new ponds, advanced water soaking, and then drug disinfection; the old pond or fish pond transformation into shrimp ponds need to dry 20-25 days exposure to dry, completely remove the sludge and weeds and then disinfection, and then use quicklime 80- 100 kg/mu thoroughly disinfected.
1. Selection and desalination of shrimp. Penaeus vannamei seedlings should be selected to be robust and disease-free. Before entering the shrimps, they must be quarantined at the local quality and quarantine department, striving to prevent the virus from being brought in from the affected area to prevent the introduction of the virus. Stocking specifications are better than 1.0 cm. For the first time, the cultured shrimps were kept in a nylon greenhouse (or greenhouse) due to earlier time and lower temperature, and they were diluted for 10-15 days. During desalination, the daily reduced salinity does not exceed 1 Torr until the salinity drops to 1 ‰ - 1.5 ‰. When the larval size reaches 1.0 - 1.5 cm, it is put into the outdoor shrimp pond. The second cultured shrimp seedlings are first surrounded by a nylon cloth in a square yard of a temporary holding pool or a large pool and placed in a dense net cage to desalinate the rough for 7-8 days, and then put into the shrimp pond. Farming.
1. Water quality management. The quality of water directly affects the growth and survival rate of shrimp. In the early stage of cultivation, water is mainly added; in the middle and later stages, more water and water are changed, and the water is changed every 5-7 days, but the amount of water exchanged does not exceed 30%. At the same time, it is necessary to open the aerator in time according to changes in climate and water quality. Apply photosynthetic bacteria or EM dew every 15-20 days to improve sediment and purify water quality.
How do South American white prawn breed freshwater bream?
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