Q: how to increase the production of green shrimp?

At present, the pond is mainly used to raise shrimp. If the average yield per unit area can be increased to 80 kg/mu, better economic benefits can be obtained. The key techniques to improve the yield per unit area of shrimp in pond culture are introduced as follows: 1. Pond conditions. (1) Water sources. Sufficient water supply, clean water quality without pollution, in line with fishery water standards, convenient water intake and drainage. (2) Shrimp ponds. The area should not be too large, 0.201-3.35 hectares is better. (3) Slope and depth of shrimp pond. Slope 1:2.5-1:3, water depth 1.2- 1.5m. (4) Substrate. The silt does not exceed 10 cm, and the bottom has a certain slope to the drainage. 2. Preparation before stocking. (1) Clear the pond. 7-10 days before stocking, sprinkle 75 kg quicklime water in the whole pool to completely eliminate wild miscellaneous fish and pathogens. (2) Water injection. After 4 days of clearing the pond, water injection is 50 cm. (3) Apply basal fertilizer. 300- 400kg fermented organic fertilizer is applied per mu before water injection. (4) Planting water plants. Aquatic plants such as bitter grass, Elodea and Potamogeton marai are planted in shallow water around the pond. The planting area of aquatic plants accounts for about 40% of the shrimp pond area. Three, stocking model (two crops stocking) ① the first crop yield of about 50 kg. The stocking time is from late July to early August, and 40,000 - 50,000 shrimp seedlings with a specification of about 2 cm are stocked per mu. Stocking should be carried out early and late in sunny days, avoiding direct sunlight during the day, and putting enough at one time. In order to regulate water quality and control autumn propagation, it is necessary to match with fish such as silver carp. There are two kinds of mixed culture methods, one is mixed old-age silver carp, with 30 silver carp of 0.3 kg/tail per mu; the other is mixed culture of silver carp and summer bream, 800 fish per mu. The first crop ends in December. (2) In the second crop, from December to January, young shrimps with a specification of about 3 cm are stocked, and 20 kg are stocked per mu. Monoculture, not polyculture fish. It ends at the end of June of the following year. IV. Feeding management. (1) Water quality. Good water quality and suitable water level should be maintained at all times during cultivation. According to the water color and transparency of shrimp pond, timely injection, drainage, regulation of water quality, maintain sufficient dissolved oxygen and fresh water quality, promote shrimp growth and molting. In the later stages of feeding, water should be changed frequently. If you change the water frequently without conditions, you can regularly sprinkle an appropriate amount of photosynthetic bacteria and substrate improver. During feeding, quicklime and phosphate fertilizer should be applied timely according to the pH value of pool water and the content of calcium and phosphorus. The dosage of quicklime is 10- 20kg per mu each time, and the dosage of calcium superphosphate is 8- 10kg per mu each time. Generally, cast once every 15 days or so. (2) Feeding and fertilization. The feed should be mainly shrimp pellet feed, shellfish and small miscellaneous fish and other fresh bait supplemented, pellet feed protein content should reach more than 35%. The suitable temperature for eating shrimp is about 25℃. Feeding should be "four fixed"(timing, quality, quantity and fixed person). At the initial stage of feeding, it is advisable to sprinkle the palatable feed all over the pool, and then put it into the shallow water around the pool and feed belt, and set up a feeding point every 1-2 meters. Feeding times, generally 2 times a day, in the water temperature of 25-30℃, should be fed 3 times a day. 1/3 in the morning, 2/3 in the afternoon. Feeding should be uniform, so that the whole pond shrimp can eat and eat. The daily feeding amount of artificial compound feed can be tested according to 2.5-5% of the weight of shrimp in the pond, and then adjusted according to the feeding situation of shrimp. It is usually eaten within 1-2 hours after feeding. The stock of shrimp can be roughly estimated from the average number per unit area and the average weight of shrimp. In order to multiply the natural food organisms in the shrimp pond, appropriate topdressing should be applied according to the water color and transparency of the shrimp pond. Water color to yellow-green or tea brown is more appropriate, transparency to maintain about 30 cm is appropriate. (3) Aquatic plants. According to the growth of aquatic plants, sprinkle fertilizer solution in planting area in time. The concentration of fertilizer solution should not be too large to avoid causing fertilizer damage. (4) Daily management. Shrimp pond must be managed by special personnel, patrol the pond 3-4 times a day, and take corresponding measures in time when problems are found. Pay attention to the environmental sanitation of shrimp ponds and strengthen the prevention and control of diseases and insect pests of shrimp.