The stocking of crabs is the first process of adult crab breeding. Selection of pure breeds, robust physique, and suitable specifications for scientific stocking of crab species is the key to the success and success of raising crabs. The stocking crab species should master the following technical points.
1. Prepare well for pre-stocking: Crab species should be drained before stocking, so that the bottom of the pool can be sun-dried or frozen for a period of time. Trimming, embankment and anti-escape equipments should be trimmed and thoroughly disinfected with quicklime, tea pot, etc. Transplanting aquatic plants such as reeds, wormwood, Elodea, Vallisneria, Hydrilla verticillata, water peanuts, etc., and put a certain number of fresh snails. In order to prevent the crab species from ingesting shoots of plants and water, the area where the total area of ​​the crab pool is about 10% can be intercepted in advance with a dense mesh net to allow the crab species to be raised for a period of time, and then the net circumference is removed to make the crab into a large ecological environment. Growing and fattening in the water.
2, pay attention to the quality of the purchase of crab species: Crab species useful natural seedlings and artificial propagation of seedlings cultivated points, as well as the Yangtze River, Liaohe River, Minjiang River system of the Other. At present, the best breeding effect is the cultivation of crabs from the natural seedlings of the Yangtze River, but the number is very small. Generally used in the Yangtze River water crabs to simulate the natural conditions of reproduction of crab species cultivated crabs, but the purchase should pay attention to identification, to prevent the real shoddy. It is better to breed crabs or purchase local healthy crabs to prevent long-distance transport of imported crabs from unknown sources or “sick†crabs. At the same time, we must identify precocious crab species. The purchased crab species must have pure varieties, suitable specifications, complete limbs, active crawling, good health, and no disease or injury. ?
3, to master the stocking specifications and density: In order to improve the product of crab specifications and aquaculture efficiency, the best choice for the cultivation of the last year, every 1kg 80 ~ 160 "deduction crab" stocking. The stocking density is based on the farming conditions, breeding mode and feeding and management measures. The principle is that the balance should not be compromised. Each 667m2 of intensive cultivation should not exceed 1,200, preferably around 700, and the polyculture and extensive farming should be generally every 667m2. Stocking 200 to 600 only. ?
4. Pay attention to scientific stocking methods: Transportation of crab species: The shorter the transportation time, the better. Within 12 hours, the crab species should be packed with mesh bags or crab seedling boxes to avoid crushing and water loss. Restocking time: It should be done sooner rather than later, usually at about 10°C. Soaking treatment: After transporting the crabs, they should be soaked in water for 2 to 3 minutes before they are stocked. This is repeated 2 or 3 times to allow the crabs to suck enough water. Sterilization of crab species: In order to prevent the crab species from bringing in parasites and germs, it is placed in a prepared solution after immersing in water (50 mg of potassium permanganate, 1 to 2 mg of nitrofurazone, or 6 to 8 mg of olaquindox for every 1 kg of water). In the medium, soak and sterilize for 3 to 5 minutes, then let it climb into the farming waters. ?
1. Prepare well for pre-stocking: Crab species should be drained before stocking, so that the bottom of the pool can be sun-dried or frozen for a period of time. Trimming, embankment and anti-escape equipments should be trimmed and thoroughly disinfected with quicklime, tea pot, etc. Transplanting aquatic plants such as reeds, wormwood, Elodea, Vallisneria, Hydrilla verticillata, water peanuts, etc., and put a certain number of fresh snails. In order to prevent the crab species from ingesting shoots of plants and water, the area where the total area of ​​the crab pool is about 10% can be intercepted in advance with a dense mesh net to allow the crab species to be raised for a period of time, and then the net circumference is removed to make the crab into a large ecological environment. Growing and fattening in the water.
2, pay attention to the quality of the purchase of crab species: Crab species useful natural seedlings and artificial propagation of seedlings cultivated points, as well as the Yangtze River, Liaohe River, Minjiang River system of the Other. At present, the best breeding effect is the cultivation of crabs from the natural seedlings of the Yangtze River, but the number is very small. Generally used in the Yangtze River water crabs to simulate the natural conditions of reproduction of crab species cultivated crabs, but the purchase should pay attention to identification, to prevent the real shoddy. It is better to breed crabs or purchase local healthy crabs to prevent long-distance transport of imported crabs from unknown sources or “sick†crabs. At the same time, we must identify precocious crab species. The purchased crab species must have pure varieties, suitable specifications, complete limbs, active crawling, good health, and no disease or injury. ?
3, to master the stocking specifications and density: In order to improve the product of crab specifications and aquaculture efficiency, the best choice for the cultivation of the last year, every 1kg 80 ~ 160 "deduction crab" stocking. The stocking density is based on the farming conditions, breeding mode and feeding and management measures. The principle is that the balance should not be compromised. Each 667m2 of intensive cultivation should not exceed 1,200, preferably around 700, and the polyculture and extensive farming should be generally every 667m2. Stocking 200 to 600 only. ?
4. Pay attention to scientific stocking methods: Transportation of crab species: The shorter the transportation time, the better. Within 12 hours, the crab species should be packed with mesh bags or crab seedling boxes to avoid crushing and water loss. Restocking time: It should be done sooner rather than later, usually at about 10°C. Soaking treatment: After transporting the crabs, they should be soaked in water for 2 to 3 minutes before they are stocked. This is repeated 2 or 3 times to allow the crabs to suck enough water. Sterilization of crab species: In order to prevent the crab species from bringing in parasites and germs, it is placed in a prepared solution after immersing in water (50 mg of potassium permanganate, 1 to 2 mg of nitrofurazone, or 6 to 8 mg of olaquindox for every 1 kg of water). In the medium, soak and sterilize for 3 to 5 minutes, then let it climb into the farming waters. ?
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