Green shrimp culture technology: how to raise green shrimp? How to increase the yield of green shrimp culture

At present,    mainly raises green shrimp in ponds. If the average yield per unit area can be increased to 80 kg / mu, better economic benefits can be obtained. In this paper, the key techniques for increasing the yield per unit area of green shrimp in ponds are introduced as follows:

First, pond conditions. ⑴ water source. The water source is sufficient, the water quality is clean and pollution-free, meets the fishery water use standard, and is convenient for entry and drainage. ⑵ shrimp pond. The area should not be too large, and it should be 0.201-3.35ha. Slope and water depth of ⑶ shrimp ponds. Slope 1. 5-1:3, water depth 1. 2-1. 5m. ⑷ substrate. The silt is no more than 10 centimeters, and the bottom is tilted to the drainage.

Second, the preparation before stocking. ⑴ cleans the pond. 7-10 days before stocking, sprinkle the whole pond with 75 kg of raw limed water to completely eliminate wild miscellaneous fish and pathogens. ⑵ water injection. After 4 days of clearing the pond, inject 50 cm of water. ⑶ applied base fertilizer. 300-400 kg of fermented organic fertilizer was applied per mu before water injection. ⑷ grows aquatic plants. Along the shallow water around the pond to plant bitter grass, Eloe algae, Rabdosia malayensis and other aquatic plants, aquatic plant planting area accounts for about 40% of the shrimp pond area.

Third, the stocking mode (two-crop stocking) the yield of ⑴ in the first crop is about 50kg. The stocking time is from late July to early August, 40, 000-50, 000 shrimp fry with a size of about 2 cm per mu. Stocking should be carried out in the morning and evening on a sunny day to avoid direct sunlight during the day. In order to regulate water quality and control autumn reproduction, it is necessary to breed silver carp and other fish. There are two kinds of mixed culture methods, one is mixed culture of silver carp with 0.3 kg / tail per mu, and the other is mixed culture of silver carp and tuantou summer flowers, each 800 per mu. The first crop ends with the dry pond in December. From December to January in the second crop of ⑵, juvenile shrimp of about 3 cm in size are released, with 20 kg per mu. Monoculture, not mixed fish culture. It ends at the end of June of the following year.

Fourth, feeding and management. ⑴ water quality. Good water quality and suitable water level should be maintained at all times during culture. According to the water color and transparency of shrimp ponds, and timely injection, drainage, regulation of water quality, keep sufficient dissolved oxygen in pond water and fresh water quality, and promote the growth, development and molting of shrimp. In the later stage of feeding, the water should be changed frequently. If you change water unconditionally and often, you can regularly sprinkle an appropriate amount of photosynthetic bacteria and bottom quality improver. During the feeding period, quicklime and phosphate fertilizer should be applied timely according to pond water and pH value and the content of calcium and phosphorus. The dosage of quicklime is 10-20 kg per mu, and that of superphosphate is 8-10 kg per mu. In the same way, it is released every 15 days or so. ⑵ feeding and fertilization. The feed should be mainly green shrimp pellet feed, supplemented by fresh bait such as Corbicula and small miscellaneous fish, and the protein content of pellet feed should reach more than 35%. The suitable feeding temperature of green shrimp is about 25 ℃. Feeding should be "four fixed" (timing, quality, quantity and person). At the initial stage of feeding, it is appropriate to sprinkle palatable feed in the whole pond, and then put it on the shoal around the pool and on the feeding belt, setting up a feeding point every 1-2 meters. The feeding frequency is usually 2 times a day, and should be fed 3 times a day when the water temperature is 25-30 ℃. Throw 1x3 in the morning and 2Action3 in the afternoon. Feeding should be uniform, so that the whole pool of green shrimp can be eaten and full. The daily feeding amount of human compound feed can be tried according to 2.5-5% of the body weight of prawns, and then adjusted according to the feeding situation of shrimp. Generally speaking, it is finished within 1-2 hours after feeding. The stock of green shrimp can be roughly estimated according to the average number of shrimp per unit area and the average body weight of shrimp. In order to increase the natural bait organisms in the breeding pond, topdressing should be applied timely and appropriately according to the water color and transparency of the shrimp pond. The water color of the pool is yellowish green or tea brown, and the transmittance should be kept at about 30 cm. ⑶ aquatic plants. According to the growth of aquatic plants, sprinkle fertilizer in the planting area in time. The concentration of fertilizer solution should not be too high, so as not to cause fertilizer damage. Daily management of ⑷. Shrimp ponds should be managed by special personnel, patrol the ponds 3-4 times a day, and take corresponding measures in time when problems are found. Pay attention to the environmental hygiene of shrimp ponds and strengthen the prevention and control of diseases and insect pests of green shrimp.