Experience of high-yield culture of river crab
The suitable area of crab pond is 10-30 mu, the depth of pond is 1.2-1.5 meters, the slope is 1:(2-3), the width of ring ditch around pond is 2 meters, and the depth is 1.8-2.0 meters. The coverage area of aquatic plants should account for 40-60% of the pond area. Suitable aquatic plants include Elodea, Vallisneria, Hydrilla verticillata, etc. The quicklime dry method is adopted to clean the pond and disinfect, and the dosage is generally 100-125 kg/mu. Calcium plastic plate, aluminum plate, asbestos plate or anti-escape net can be used as anti-escape wall materials. Before Qingming, 200- 250kg of live snails are put into each mu, 160-200 crabs/kg are suitable for stocking, and the stocking density is generally 1000-1200/mu. In the early and late stages of crab feeding, animal feed is the main one, accounting for 60-70%, plant feed accounts for 30-40%, and it can be fed once a day in the evening. In the middle feeding period, plant feed is the main feed, accounting for 60-70%, animal feed accounts for 30-40%, feeding twice a day, feeding once in the morning and evening, feeding amount in the morning accounts for 30% of the total feeding amount in the day, and in the evening accounts for 70%.
Before stocking, the button crab is subjected to seedling delaying treatment, the button crab and the net bag are put into water for soaking for 1-2 minutes, taken out and placed in the air for 3-5 minutes, and the method is repeated for 2-3 times, and stocking is carried out after the button crab fully absorbs water and adapts to the water environment. Before the aquatic plants grow luxuriantly, the crab species should be isolated in a small area convenient for management when stocking, so as to prevent the crab species from damaging the growth of the planted aquatic plants. After the aquatic plants grow luxuriantly, the mesh should be removed to allow the crab to enter the aquatic plant area for feeding.
Daily management shall be strengthened during breeding period: ① Double-layer blocking net and pond escape prevention facilities set in inlet and outlet of breeding water area shall be checked frequently, and holes shall be repaired in time if any;② In flood season, attention shall be paid to managing escape prevention facilities to prevent flood from destroying escape prevention facilities;③ In crab growth period, it is prohibited to shoot weeds, release ducks and fish in breeding water area;④ Toxic and harmful substances shall be strictly prevented from flowing into breeding water area, and prohibited drugs shall be prohibited to ensure product quality and safety.
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Attention should be paid to the fattening of river crabs
At present, the river crab is shedding its shell for the last time and entering the stage of fattening and rapid weight gain. At this time, breeding and management should pay attention to the following points: first, at the stage of paying attention to the problem of water quality, although the water temperature has dropped, the storage capacity of river crabs, fish, shrimp and other ponds in the pond
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How to prevent frost in temporary culture of river crabs in winter
1. The temporary culture density of ice-breaking commercial crabs is high, and the temperature is low after snow, so it is difficult to culture and manage. By hitting the ice hole or breaking the ice, on the one hand, we can observe whether the overwintering pond is short of water and lack of oxygen, on the other hand, it can make some harmful gases escape from the water body. Lack of water
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