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Soil-closed shrimp farming
1. Shrimp Pond Condition The water quality of the sea area where the shrimp pond is located should be clean, and industrial wastewater discharged from sugar-free plants, paper mills, and starch factories should be contaminated. The natural water depth should be more than 60 cm, and the minimum annual salinity change of seawater should be no less than 1 ‰. Second, the intake gate is set to adopt closed earth culture in the earthen pond, which does not need to receive water from the sea during the later period. Therefore, the pond only needs to be installed into the water gate. Each 10 mu shrimp pond is equipped with a 1-meter-wide intake sluice, 3 sluice gates are installed in the sluice chamber, and the filter mesh is installed in the outer sluice. Gates are set in the middle sluice, each sluice is about 20 centimeters wide, which facilitates the adjustment of shrimp pond water level. The inner tank is equipped with a conical filtration watertight net. 3. Preparation before laying seedlings 1. Drill the well on the shrimp pond in the shrimp pond. The depth of the well must be able to meet the continuous water supply needs of the shrimp pond. A water pump with a flow rate of 100 cubic meters is installed for each 5 mu pond. 2. Into the pool after the sun 10 cm, lime per acre 80 kg, when the lime emulsified, with a shovel or bamboo raft to lime spill evenly. 3. After the disinfection, drain the pool water, install a 60-mesh sieve-shaped conical mesh bag (8 meters to 100 meters long), and use a cotton cloth or sack to lock the bottom of the gate, leaving no gaps. When entering the water for the first time, one or two gates are reserved at the bottom of the gate to prevent excessive water from flowing into the mesh bag and causing the mesh bag to break. In 2 days to 3 days, the water is poured into a depth of 60 cm to 70 cm, and the gate is sealed with clay to prevent the pool water from penetrating through the gap in the gate. Fourth, the stocking density of shrimp seedlings is determined according to the depth of storage of shrimp ponds. The depth of water is 1m to 1.3m, and the larvae of white-spotted prawn are each planted with 0,800 to 10,000 seedlings per mu, the white shrimp are 10,000 to 12,000 larvae per mu, and the water depth is 1.4 to 1.8 meters. 10,000 to 13,000 tails, and 130,000 to 15,000 tails per acre were planted. Stocking specifications (body length): Prairie prawn 1 cm to 1.2 cm, and Penaeus vannamei 0.8 cm to 1.2 cm. Fifth, the bait feed bait feed should be implemented on the principle of small meals, body length 6 cm before feeding 3 times a day, more than 6 cm after feeding 4 times a day. Sixth, water quality issues 5 days after the seedlings began to add well water to the shrimp pond, add water once every two days, each adding water 5 cm, until the shrimp pond reaches the depth of water storage. Summer hot weather should fill the pool. The water is added to the upper limit of the shrimp pond 1 day to 2 days before the rainstorm, so that the falling rainwater will naturally overflow through the upper edge of the gate to prevent the rainwater from salinizing the shrimp pond and the pH value will drop drastically, affecting the growth of the shrimp or causing the dead shrimp. . 7. Disease prevention and control As the change of the water color and the blackening of the bottom of the pool, the pool of shrimps is disinfected and the sediment quality is improved. Persistently disinfect shrimp ponds with 1.5ppm bleach every 15 days, and improve the bottoms with zeolite (20kg/mu) or lime mud. A course of medicine is given every 15 days. Each course of treatment lasts for 3 days to 5 days. The baits are made with 3 ‰ vitamin C, 2% allicin and appropriate amount of cod liver oil.