Raising green prawns in rice fields in winter

Raising shrimp in paddy field in winter is a mode of raising shrimp in winter by making use of the winter leisure time after rice harvest. The main points of breeding techniques are introduced as follows: first, timely stocking. After the shrimp harvest, immediately select some rice fields with deeper water level and better conditions in the shrimp ditch, dig out too much silt in the shrimp ditch, renovate and strengthen the ridges, and inject fresh river water. If a season of rape or wheat is to be planted in the rice field, the water level in the shrimp ditch can be maintained at 1.2 meters; if you do not grow rape or wheat, the whole rice field can be used to cultivate green shrimp. 20 000 ~ 25000 shrimp species can be raised on the surface of shrimp ditch per mu, with specifications of 2 cm ~ 4 cm. The best stocking time is mid-December. Second, put in enough bait. The prawns can feed and grow throughout the winter, and they should "grab both ends and take the middle" in the bait. That is, it is necessary to seize the 15-20 days after the shrimp species are released, mainly with refined feed, and the daily feed amount is 5% of the body weight of shrimp in the field; from January to February, some bait can be fed at noon in sunny and warm weather; from March, the feeding intensity of green shrimp gradually increased, the daily feeding amount was 3%-5%, and increased to 6% in April. May is the stage of laying eggs and holding larvae of green shrimp, and it is also the fastest growing season of green shrimp. The daily feeding amount can be increased to 8%, and it can be fed 3 ~ 4 times a day. Strive to make the specification of green shrimp more than 5 cm in late May. Third, strengthen management. While doing a good job of baiting, we should also do a good job of feeding and management. In the cold weather from January to February, field inspection should be strengthened. if the water surface is frozen, it is necessary to break the ice and increase oxygen in time to prevent the prawns from suffocating to death due to the water surface freezing. From March to May, the management of water quality should be strengthened and the frequency and quantity of water replacement should be determined according to the concentration of water quality. When injecting water, we should choose sunny and warm weather around 11:00 in the morning, when the water temperature of the outer river is close to that of the shrimp ditch, so as to avoid excessive temperature difference and keep the water temperature and water level of the shrimp ditch stable. Fourth, harvest at the right time. Shrimp are usually caught in dry ponds in late May, when most of the female shrimps with specifications of more than 5 cm have already laid eggs, and some of them can be used as parents for breeding shrimp seedlings, and the rest can be sold.