The shrimp and crab polyculture method has the advantages of low investment, quick turnover, high efficiency, low risk, easy to grasp, etc. The specific operating techniques are as follows:
1. Pond conditions: pool pond area of ​​3-5 acres. Two-layer anti-escape facilities are provided. The outside edge of the pool is covered with linoleum or calcium-plastic plate. The height is 55 cm to prevent rats and frogs. The pool edge is then re-used with a 0.8 mesh polyethylene net to form a fence. 120 cm, under the lining 60 cm high plastic cloth. Renovate the pond before putting it aside and clean up excess silt. The bottom of the pool is required to be flat and solid. In the second half of February, 100 kilograms of quick lime will be used for disinfection per acre. About 20 centimeters of water will be poured around February 20, and the water inlet will be filtered with a 50-mesh sieve to prevent the entry of predator organisms.
2. Water-grass transplantation: On the 10th of March, submerged plants such as Hydrilla verticillata and Malay Oozi were started to be transplanted, accounting for more than 60% of the water surface area. Another put snail 300 kg/mu.
3. Seed rearing: Before and after the end of February, stocking shrimp with 1.8-2.0 cm in stocking size, stocking 750-800 eggs per acre, stocking 3-4 young crabs on April 20 and stocking 750-800 per mu. only.
4. Feeding management: Based on the full use of aquatic grass and snails, it mainly depends on artificial feeding. Early feeding of boiled small junk fish (mixed with wheat flour); mid-term feeding of chopped small junk fish with bran, corn, and wheat concentrates; followed by concentrates, with corn and wheat boiled and fed Add animal feed once every 7 days. 3.5-4 kilograms of refined material per day, about 3 kilograms of animal feed, depending on the remaining situation of the residual bait decided to change the amount of feed. Feeding was done in the shallow water of the pool and was fed at 6 pm every day.
5. Water quality management: The water level in the early stage of cultivation is about 60 cm. When the water temperature reaches 20°C, the water level is adjusted to 70 cm. When the water temperature reaches 25°C or more, the water level rises to about 1 meter. When the water temperature exceeds 30°C, the water level is controlled at 1.5. Meters around. 2-3 days change: water once, each time the total amount of water for 1/3.
6, disease prevention; water temperature is 20-25 °C, every 20 days with 0.5x10-6 concentration of lime water Quanchiposa, 25 °C above every 10 days with 1x10-6 concentration of lime water Quanchiposa. The pH of the pool water is maintained at 7.5-8.5, and the bait is periodically fed at the peak of the disease. 6 grams of oxytetracycline per kilogram of bait is mixed with 5-6 days as a course of treatment.
7. Fishing: The fishing methods include cage net capture, shore capture and dry pool capture.