1. Species of Crab Species Currently, there are many varieties of crabs on the market, and there are many kinds of crabs. There are natural river crabs of the Yangtze River, artificially cultivated crab species, Liao crab, Oujiang crab, small old crab, sexually mature crab species, etc. Seen from the rearing effect, natural Yangtze River water crabs and artificially cultivated first-line crab species in the Yangtze River water system have good feeding effect, long growing period, high catch-returning rate, and high aquaculture production, while Liao crab and Oujiang crab have short growth period and return. The catch rate is low. Young crabs and sexually mature crabs have matured gonads. They cannot grow normally during the growing season. They will die in large numbers and have no feeding value. Therefore, for crab culture, natural crab species in the Yangtze River system and artificially cultivated first-instar crab species should be preferred.
Second, stocking density and specifications With the formation of the crab buyer's market, high-quality large-size crab is the only way for future crab production. In the stocking mode, a thin, large and high stocking mode should be implemented. Sparse, ie, sparse stocking densities, large stocking specifications to be large, eventually raising yield, good efficiency crabs. The pond raises crabs and the general mu stocking crabs are 600 to 800, and the specifications are 240 to 280 per kilogram; the large water surface to raise crabs generally has 400 to 600 pieces of crabs, and the specifications are 200 to 220 pieces per kilogram.
Third, disinfection into the pool With the expansion of the scale of crabs, aquaculture production increase, and the introduction of species increased between regions, crab disease is becoming more serious. The disinfection of crabs is an important measure to prevent crab disease. When stocking crabs, they can be soaked with 3% to 5% of salt water for 10 to 15 minutes to sterilize and kill pathogens on the surface of crabs.
Fourth, the crab species body stocked crab species requires a strong constitution, uniform specifications, white crust, crustacean complete appendage, no disease, no injury, no algae attachment, can quickly climb down the river after falling to the ground.
Fifth, stocking methods Crab species after long-distance transportation, long time away from the water, crab species silk shrink, such as direct access to the pool, crab species because of silk suddenly absorb water and swell. In order to increase the survival rate of crab species, the crab species should be soaked in water for 5 minutes, then placed on the shore for 20 minutes, repeated 2 times to 4 times, and the crab species should be sucked into the water and then put into the pool.
Sixth, transportation methods Currently, crabs are transported using net bags. The net bags are small in size, soft and afraid of pressure, and the crab species climb and climb each other. Together with bumps along the way, they are easy to damage the crab body. After the animals are released, they are susceptible to the disease and die. . The transportation of crabs should promote the shipment of crab seedlings, and the space is large. Crabs have more room for action and can avoid crabs squeezing each other. Before shipment, evenly put a small amount of plants in the box. Each box is shipped with 1200 to 1,600 pieces of crabs. The route should be selected for the nearest route. The transportation time should be controlled within 4 hours to 6 hours, and the water should be sprayed every 1 hour on the way.
Second, stocking density and specifications With the formation of the crab buyer's market, high-quality large-size crab is the only way for future crab production. In the stocking mode, a thin, large and high stocking mode should be implemented. Sparse, ie, sparse stocking densities, large stocking specifications to be large, eventually raising yield, good efficiency crabs. The pond raises crabs and the general mu stocking crabs are 600 to 800, and the specifications are 240 to 280 per kilogram; the large water surface to raise crabs generally has 400 to 600 pieces of crabs, and the specifications are 200 to 220 pieces per kilogram.
Third, disinfection into the pool With the expansion of the scale of crabs, aquaculture production increase, and the introduction of species increased between regions, crab disease is becoming more serious. The disinfection of crabs is an important measure to prevent crab disease. When stocking crabs, they can be soaked with 3% to 5% of salt water for 10 to 15 minutes to sterilize and kill pathogens on the surface of crabs.
Fourth, the crab species body stocked crab species requires a strong constitution, uniform specifications, white crust, crustacean complete appendage, no disease, no injury, no algae attachment, can quickly climb down the river after falling to the ground.
Fifth, stocking methods Crab species after long-distance transportation, long time away from the water, crab species silk shrink, such as direct access to the pool, crab species because of silk suddenly absorb water and swell. In order to increase the survival rate of crab species, the crab species should be soaked in water for 5 minutes, then placed on the shore for 20 minutes, repeated 2 times to 4 times, and the crab species should be sucked into the water and then put into the pool.
Sixth, transportation methods Currently, crabs are transported using net bags. The net bags are small in size, soft and afraid of pressure, and the crab species climb and climb each other. Together with bumps along the way, they are easy to damage the crab body. After the animals are released, they are susceptible to the disease and die. . The transportation of crabs should promote the shipment of crab seedlings, and the space is large. Crabs have more room for action and can avoid crabs squeezing each other. Before shipment, evenly put a small amount of plants in the box. Each box is shipped with 1200 to 1,600 pieces of crabs. The route should be selected for the nearest route. The transportation time should be controlled within 4 hours to 6 hours, and the water should be sprayed every 1 hour on the way.
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