Technical points of cultivating High-yield and High-quality Green Shrimp

(1) single culture of green shrimp in the pond, the pond condition area is 5-10 mu, the water depth is 0.8-1.5 meters, the ridge is strong and does not leak, the slope is 1: (2-3), the bottom is flat and slightly inclined to the drain, and the silt does not exceed 20 cm.

2. Prepare ① medicine to clear the pond before stocking: enter 20 cm of water 7-10 days before stocking. After mixing with 100kg quicklime per mu, the whole pond is evenly sprinkled for disinfection to remove wild miscellaneous fish and harmful substances; ② aquatic grass cultivation: varieties include verticillium verticillata, yellow filament grass, etc., the planting area accounts for 30-50% of the pond area, water injection fertilization. 3. Water quality management ① uses microbial preparations, such as EM bacteria, photosynthetic bacteria, etc., and biological bacteria are used once every 15 days from late August to early November to improve the pool water environment. ② micropore oxygenation: every 20 mu is equipped with a 3kw microporous aeration pump, each pond has two parallel long-side main pipes, and each mu pond is equipped with 6 disc-type microporous tube discs with a diameter of 1.5m. The dissolved oxygen requirement is more than 5 mg / L. when the dissolved oxygen in the shrimp pond is less than 5 mg / L, turn on the oxygen pump, usually from 12:00 to 16:00 in the afternoon and 24:00 to 6:00 the next morning, on rainy or sultry days. 4. The feeding management is mainly fed with different specifications of full-price compound feed of green shrimp in different periods, supplemented with rice bran and other bait in the early stage. Feed twice a day, accounting for 1p. 3 in the morning and 2 in the afternoon. Adhere to the "four look" (depending on the season, weather, water color, eating activities) and "four fixed" (timing, positioning, qualitative, quantitative). The daily dosage is 3-7% of the body weight of shrimp, the specific feeding amount is 2-3 hours, and the feed coefficient of the whole season is 1.5-1.8. (2) the pond area of mixed culture of shrimp and crabs is unlimited, generally, it is appropriate not to exceed 50 mu, and the water depth is 1.0-1.5 meters. Pond cleaning, disinfection and recommendation are carried out according to the operating rules of river crab culture. There are 5-8 silver carp and bighead carp per mu, and 200-250 kg of live snails per mu. The main aquatic plants are verticillium verticillata, yellow filamentous grass, Elorella vulgaris and so on. The coverage rate of aquatic plants is controlled at about 60%. During the growth of young prawns in autumn, proper fertilization and a small amount of powdered feed were given. The use of insecticides and disinfectants should avoid not only the molting peak of river crabs, but also the molting peak of green shrimp.