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1. Pond conditions The area of ​​shrimp culture ponds is 0.3 to 0.6 hectares (5 to 10 acres). If the old pool of fish farming is changed to shrimp ponds, the shrimp ponds must be trimmed and reinforced according to the requirements of the shrimp ponds. Chigi, Chipo, and Kaihuangou, with a slope at the bottom of the pool, set 20-30 square meters of shrimp pond at the outlet. In spring, mechanical farming and flooding the bottom of the pool lasted for 2 months. Put fresh lime in the pond 10 days before the shrimp seedlings. The water source is fresh and pollution-free.
2. Cultivation of shrimp seedlings After cultivation, exposure and disinfection, the shrimp seedling breeding pool will put 50 kg of large, well-prepared mature female eggs on May 15th. After scooping the shrimp in the pond, 20 to 22 kilograms of rice bran per hectare of water will be poured at 5 o'clock per hectare every day, and chicken manure or pig manure will be put in bag corners. Fertilizer water quality will be controlled at about 40 cm, 8~ Ten days later, juvenile shrimp can be seen by the pond. At this time, it is necessary to start pouring soy milk, soaking and refining with 12 kg of dried soybeans per hectare of water every day, and feeding them in two batches, respectively, at 8:00 am and 5:00 pm, and every day from the 10th to the end of June. 2 At 8:00 AM, soymilk is splashed with 10 kg of dried soybeans per hectare, and rice bran and wheat flour are given at 5:00 pm, 15-20 kg per hectare. Gradually add new water to gradually increase the water depth from 0.8 meters to 1.2 meters. In June, new water will be injected every 2 to 3 days. Each injection of water will start the pump for 1 hour. Fish enters. After the juveniles are detached from the brood, they will be caught on the market to catch broodstock. By the end of June, the juveniles will grow to 1.5 cm and they will be counted for stocking.
3. Reasonable stocking juvenile shrimp stocking time from the end of June to early July, the choice of windy weather is more appropriate to stocking, sunny days will have to stocking in the morning, when the wind will have to stocking in the upswing. 1.5 million juveniles of 1.5 centimetres per hectare are stocked. Since the self-bred and self-bred prawns are of good constitution and short distances for transport, the survival rate is high. Shrimp seedlings are planted with 18 thousand hectares per hectare of summer carp after 18 days.
4. Feeding and management In early July, shrimps will be fed immediately after stocking is completed. Rice bran and wheat bran are used for 15 kilograms per hectare of water every day, 30% at 7:00 am to 8:00 in the morning and 5:00 to 6:00 in the afternoon. 70%, after 8 months every day from 7:00 to 8:00 a.m. of water per hectare, feed 10 to 15 kilograms of bait, and gradually increase the amount of feed. When baiting, the boat is used for feeding. The boat travels back and forth within the pool and spreads evenly in the shallow water of 0.5 to 1.0 meters from the pool so that the bait does not accumulate, so that the shrimp can not only fully find the bait, but also does not use the bait. Deposition causes pollution. At night and in the early morning, check the feeding activities and growth of the shrimp. It is advisable to eat it in the morning or with a little surplus. Water quality management is the key to the cultivation of freshwater shrimp. Pool water is often kept green, about 40 centimeters in depth and about 1.3 meters deep. During the high-temperature season from August to September, the water temperature, PH, and dissolved oxygen should be frequently detected. The new water should be filled every 2 to 3 days. The pumping time should be 2 to 3 hours per day. If the water is too dark, the new water must be replaced in time. With a 60 mesh polyethylene net mesh. At the same time, it often cleans the algae weeds to keep the shrimp ponds clean and creates a good living environment for the growth of the shrimps.
5. Timely listing in winter Starting from mid-October in mid-April, a large number of products will be listed on the market before and after the Spring Festival. Trawling nets will be used to catch large fish. After several net fishing, half of the pool water will be drained, captured with the dense-eyed fish net, and then dried. Pool. Shrimp will not reach the market specifications and continue to raise the pool, and all out of the pool until May next year.
In the year before last, Shandong Zhanhua County Oceanic and Fisheries Bureau carried out a pilot test of self-propagation of green prawns at aquaculture farm in Xianhe Town, Dongying City, and obtained 11 million shrimp seedlings in two breeding ponds (area of ​​1.3 hectares) at 9.2. In the surface of hectares of shrimp culture, the total yield is 5900 kilograms of freshwater prawn, and the total output of squid in the pool is 4,120 kilograms, which has achieved good economic benefits. Experiments have shown that the farmed shrimps have low input, are easy to manage, and have stable yields. The main technologies for pond culture of shrimps are summarized below.