Aspects to be done in intensive Culture of Green Shrimp in Autumn and Winter

At present, it is the key season for shrimp stocking in autumn and winter. It is the most important thing to control the substrate, germplasm, bait and water quality, and to prevent disease and floating head at the end of the year. The following five aspects are discussed about the technology of shrimp intensive culture for reference by the majority of farmers.

I. Do a good job in infrastructure construction of shrimp ponds. Pay close attention to the work of drying ponds, clearing ponds, eliminating pests and drying ponds before stocking, and change the practice of only raising ponds without drying ponds. Because a large number of bacteria are produced in the pond after one year of cultivation, the increase of sludge in the pond is easy to make shrimp hypoxia float. The wide pool ridge should be reformed, and the thin pool ridge should be raised and widened. The suitable pond area is 8 mu ~10 mu, the water depth is 1.2 meters ~1.5 meters, and there should be a certain area of shrimp beach, there is a shrimp collection ditch in the middle, and the water inlet and drainage system is matched. The bottom of the pond is disinfected by sprinkling 60 - 70 kg quicklime per mu, and exposed to sunlight for 15 - 20 days. Second, timely fertilization is mainly to cultivate the early water quality, so that shrimp seedlings can have a proper amount of open zooplankton after stocking, mainly using fermented organic fertilizer, 150 kg ~250 kg per mu. In addition, chicken manure granular fertilizer is advocated. The principle is that the fertilizer is not easy to pollute the water environment after high temperature disinfection treatment, and chicken manure contains potassium fertilizer element, which is beneficial to the growth of shrimp shell. Fertilization time is 4 ~5 days before putting shrimp, 10 ~15 kg per mu in old pond and 15 ~20 kg in new pond, and the whole pond is splashed. If the water quality is still light after stocking, the fertilizer can be increased by 5 kg to 7.5 kg to achieve the fertility, vitality, tenderness and freshness of the pool water, and to prevent the appearance of moss and blue algae. 3. Reasonable stocking of shrimp in autumn is from late July to early August. Shrimp seedlings are selected from Taihu Lake to cultivate wild shrimp seedlings. The principle is that wild shrimp has strong disease resistance, neat specifications and high listing rate. The stocking specification is 1.5 cm ~1.8 cm, and the amount per mu is 60,000 ~ 80,000. 800 ~1000 silver carp summer flowers and 800 ~ 1000 bream were bred in 10 ~15 days after stocking. Fourth, feeding and water quality management stocking shrimp seedlings should choose sunny days, if there is a palatable amount of red worms in the pond, 1 day to 2 days can not feed, wait for red worms to be eaten up before feeding bait. The bait should choose the high quality shrimp special feed, like the big river brand feed. The first 15 ~20 days feeding broken feed, medium for No. 1 feed, late for No. 2 feed, and add animal fish. The yield of autumn shrimp per mu is 100 kg, which requires 150 kg of granular feed, 50 kg of small miscellaneous fish or 750 kg of snails, with a feed coefficient of 1.8~2 and a feed cost of 500 ~600 yuan. Five, do a good job of disease prevention, anti-floating head and other management work after 15 days to 30 days of stocking shrimp seedlings, choose sunny days to apply 4 kg to 5 kg of quicklime per mu, such as bacterial shrimp disease can be applied chlorine dioxide or "strong chlorine essence", generally applied 200 grams per mu. Pool water plants should be retained one-third, moss can be added fertilizer, appear green salamander algae can be added flower silver carp fat fish. A 3000 watt aerator can be used for every 6 mu ~7 mu. After stocking for 20 days, it should be started for 1 hour ~2 hours at noon every day, and started in the middle of the night and early morning on rainy days to ensure that anti-floating work is done well. Double-channel net (60 mesh, 80 mesh) shall be adopted for water inlet to strictly filter wild miscellaneous fish.