Paddy field crabs
The economic benefits of crab cultivation in paddy field are better, which is one of the contents of the adjustment of rural industrial structure and the development of efficient agriculture. However, crab breeding must have a certain breeding environment conditions and strong technical skills. Based on the situation of the south rice area in our district, combined with the experience inside and outside the province, we summarized the technical points of crab cultivation in the paddy field. First, Wai Tian engineering design. In paddy field, aquaculture should be selected from the water source, with convenient drainage and drainage, no pollution and good water retention performance. The paddy field is surrounded by open trenches (or pushes) to build the water in the surrounding fields, and the water inlet and outlet are laid with culvert pipes. The embankment is about 1-1.5 meters high, with a width of 2 meters and a slope of 1:2.5. The cofferdam should be compacted after planting. Second, anti-escape facilities. Rice field acreage should be set to prevent escape. Can choose to use strong anti-oxidation calcium plastic plate, aluminum printing plate or nylon plastic film and other materials, along the four sides around the field, the bottom buried 10-15 cm of soil, the top 50-70 cm above the ground, both sides of the wood Pile support, four corners must be made into a circular arc. The inlet and outlet openings are closed with fine wire mesh to prevent crabs from fleeing. Third, completely clear. After the field was cleared of rice blast and exposed to sunlight, one month before stocking, the water was drained. After 100-150 kg of lime per acre was used, the whole pool was splashed and the water could be released after half a month. Fourth, the field of grass planting. Along the side of the pond field, the water is transplanted with phyllanthus verticillata, philodendron (water peanut), water hyacinth, and water celery. Water plants cover up to 30% of the water surface. Aquatic grass provides a good habitat for crabs, feeding, clam shells, and hidden activities, while also playing a role in stabilizing water quality. Fifth, stocking crabs. It is necessary to choose and put in the Yangtze River water system with clean, high quality and good quality. The number of mu stocking is 1000-1200 pieces, and the specification is 150-200 pieces per kilogram; the size of 2 cm young shrimp is 1.5-20,000 pieces (or 50 grams of broodstock); 80-100 silver carp species are silver.鲫 30-50 tail, specifications about 13 centimeters per tail. When the crabs are stocked, they are sterilized with 5-10 ppm malachite green. Six, feeding and management. After deducting crab under the pond, it can be fed with bean cake, bran, rice bran, wheat, duckweed, pumpkin, small junk fish, snail, turtle meat and pig blood, lungs, etc. The amount of daily feeding is 5-10% of crab body weight. It is necessary to pay close attention to the weather, water quality, and the eating and feeding of crabs to gain a good grasp of the amount of daily investment. During the entire period of feeding, a coarse and fine principle was adopted; that is, fresh small mixed fish and bean cakes were used for feeding, and bran No. 4 powder was used for feeding. In the first half of the year, the feed can be plant-based feeds such as bran, duckweed, and grain feeds of appropriate protein content; in the second half of the year, high-protein pellet feeds and animal feeds such as small-sized fish and snails can be added. VII. Water Quality Control. Water quality should always be fat and cool, with a transparency of 30-40 cm. The leaner field is susceptible to disease. To regularly adjust the water quality, choose early morning water, 10 to 20 centimeters each time. Keep water level during high temperatures. The diseased pond can only be changed after being stabilized by drug treatment. In order to increase the amount of calcium in the water, 1 to 2 limes can be applied in the first half of the year, each time 5 kg per mu, and after the water is turned on, the whole pool is splashed. The water quality is relatively thin and can be cultivated with phosphorus and nitrogen fertilizers. Eight, disease prevention and treatment. The main diseases of breeding crabs include rotten limbs, ink bleeds, edema, ciliates and shivering diseases. Regular disinfection with chlorine dioxide (or chlorine-rich) water can effectively prevent disease outbreaks. After the onset of the disease should be treated in time, please expert diagnosis and treatment, the right medicine. Disease prevention and treatment should be focused on prevention, combining prevention and control, and promoting ecological control, healthy breeding, and comprehensive treatment.
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