Third, the rice field crab breeding stock
1. Prepare before putting. Twenty days prior to release, clear the ditch (tang) with drugs such as quicklime to disinfect and kill harmful organisms. After the toxicity disappears, add water to control the water level in the ditch and temporary holding pool to within 0.6-1m; crabs and shrimps In polycultured paddy fields, 12-15 (tons) of livestock manure is applied per hectare (1 hectare = 15 mu) to fertilize the water quality; at the same time, aquatic plants such as Hydrilla verticillata, Malayyangzizi, and water peanut are transplanted to require ring occupation. Ditches and 1/2-1/3 of the area of ​​farms, for crabs, shrimp for food or attachment, to create a good ecological conditions for the stocking of crabs and shrimp.
2. Quality requirements. Rice field crabs require the use of crabs reared by the crabs on the Yangtze River. The number of crabs per kilogram is about 160,000. After 4 days of desalination, the salinity of the pool water is less than 5 出 when it is out of the pool. Neat, pure color, swimming crawling active. During the inspection, the crab can be drained and grabbed with water. Grab it gently and then release his hand. If he immediately flees around, he crawls quickly and proves that the quality of the crab is better. On the contrary, the quality is relatively high. difference. The species required for stocking was moderate in size, neat in size, robust in physique, active in crawling, complete in appendages, and free from disease and injury. Sources and origins are unknown, large and small trees, limbs are not homogeneous, severely injured or long-distance trafficking of crab species should not be purchased.
3. Transport method. Crab transportation can usually use wet and dry methods. The wet method can be used to transport oxygen in nylon bags with water, 5 kg of fresh water in bags, and the appropriate amount of chlortetracycline or tetracycline as a disinfectant. About 0.5 kilograms of crabs are placed in each bag. Oxygen is tightly closed and the bag is transported. box. You can also put fresh water instead of fresh water. The dry transport is to use the crab seedlings box, and a rectangular air window is opened on each side of the box. The window screens are nailed, and each 5 boxes are stacked in a group and capped and tied. Each box of crab seedlings can hold 1–1.5 kg, spread evenly, and drain the water. During the transportation process, wind, sun, rain, freezing and high temperature are prevented. For transportation of crabs, net bags can be made of polyethylene mesh. The size of the mesh is based on the principle that crab species will not climb out. When loading crabs, soak the net bags first, then grow the crabs, pack 3-5 kilograms each, and then transport them by car. Avoid stacking. During the transportation of seedlings, strengthen management, regularly spray fresh water, and prevent exposure to wind, rain and rain to improve the survival rate of transportation and stocking.
4. Seed stocking. The stocking time of crabs cultivated in paddy fields generally starts from late May to the end of June. After the crabs are bought back, a small water body is surrounded by a net in the holding pool or ring ditch, and the crabs are released as required. The fish is fed 3-5 times a day, and the feed made from the eggs and eggs is added to the crabs. After the young larvae and larvae of the bred Yixiang III were planted and turned green, they were removed from the net and water was added to the paddy fields. The young crabs were allowed to enter the paddy fields and grow up. In the rice field where crabs are cultivated, the juvenile crabs usually begin to be stocked in January and end in May. Early stocking can enable crabs to adapt to the environment of paddy fields in advance, eat food earlier, extend the growing season, and increase the market size. Young crabs purchased from other countries must be soaked in water for a long period of time. They should be soaked in water for 2-3 minutes, removed and placed for 10 minutes, and then soaked in water for 2-3 minutes before being removed and placed. Repeat this 2-3 times to rinse off the foam. After the juvenile crab is gradually sucked in enough water and then stocked in the paddy field, the survival rate of juvenile crabs can be improved. (to be continued)
1. Prepare before putting. Twenty days prior to release, clear the ditch (tang) with drugs such as quicklime to disinfect and kill harmful organisms. After the toxicity disappears, add water to control the water level in the ditch and temporary holding pool to within 0.6-1m; crabs and shrimps In polycultured paddy fields, 12-15 (tons) of livestock manure is applied per hectare (1 hectare = 15 mu) to fertilize the water quality; at the same time, aquatic plants such as Hydrilla verticillata, Malayyangzizi, and water peanut are transplanted to require ring occupation. Ditches and 1/2-1/3 of the area of ​​farms, for crabs, shrimp for food or attachment, to create a good ecological conditions for the stocking of crabs and shrimp.
2. Quality requirements. Rice field crabs require the use of crabs reared by the crabs on the Yangtze River. The number of crabs per kilogram is about 160,000. After 4 days of desalination, the salinity of the pool water is less than 5 出 when it is out of the pool. Neat, pure color, swimming crawling active. During the inspection, the crab can be drained and grabbed with water. Grab it gently and then release his hand. If he immediately flees around, he crawls quickly and proves that the quality of the crab is better. On the contrary, the quality is relatively high. difference. The species required for stocking was moderate in size, neat in size, robust in physique, active in crawling, complete in appendages, and free from disease and injury. Sources and origins are unknown, large and small trees, limbs are not homogeneous, severely injured or long-distance trafficking of crab species should not be purchased.
3. Transport method. Crab transportation can usually use wet and dry methods. The wet method can be used to transport oxygen in nylon bags with water, 5 kg of fresh water in bags, and the appropriate amount of chlortetracycline or tetracycline as a disinfectant. About 0.5 kilograms of crabs are placed in each bag. Oxygen is tightly closed and the bag is transported. box. You can also put fresh water instead of fresh water. The dry transport is to use the crab seedlings box, and a rectangular air window is opened on each side of the box. The window screens are nailed, and each 5 boxes are stacked in a group and capped and tied. Each box of crab seedlings can hold 1–1.5 kg, spread evenly, and drain the water. During the transportation process, wind, sun, rain, freezing and high temperature are prevented. For transportation of crabs, net bags can be made of polyethylene mesh. The size of the mesh is based on the principle that crab species will not climb out. When loading crabs, soak the net bags first, then grow the crabs, pack 3-5 kilograms each, and then transport them by car. Avoid stacking. During the transportation of seedlings, strengthen management, regularly spray fresh water, and prevent exposure to wind, rain and rain to improve the survival rate of transportation and stocking.
4. Seed stocking. The stocking time of crabs cultivated in paddy fields generally starts from late May to the end of June. After the crabs are bought back, a small water body is surrounded by a net in the holding pool or ring ditch, and the crabs are released as required. The fish is fed 3-5 times a day, and the feed made from the eggs and eggs is added to the crabs. After the young larvae and larvae of the bred Yixiang III were planted and turned green, they were removed from the net and water was added to the paddy fields. The young crabs were allowed to enter the paddy fields and grow up. In the rice field where crabs are cultivated, the juvenile crabs usually begin to be stocked in January and end in May. Early stocking can enable crabs to adapt to the environment of paddy fields in advance, eat food earlier, extend the growing season, and increase the market size. Young crabs purchased from other countries must be soaked in water for a long period of time. They should be soaked in water for 2-3 minutes, removed and placed for 10 minutes, and then soaked in water for 2-3 minutes before being removed and placed. Repeat this 2-3 times to rinse off the foam. After the juvenile crab is gradually sucked in enough water and then stocked in the paddy field, the survival rate of juvenile crabs can be improved. (to be continued)
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