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(a) Construction and preparation of greenhouses
1. Stand construction pond: The earth pond area is generally 0.034-0.067 hectares, the depth of the pond is 0.8-1.2, the water depth is 0.3-0.8 meters, and the east-west direction is appropriate. The bottom of the pool is flat and the slope ratio of the pool is about 1:1.5; the plastic greenhouse steel frame or bamboo The wooden frame is open at both ends, and the large film is attached to the top of the membrane and buried in the earth. A bamboo row bridge is set in the middle of the shed, which is 30 cm above the water surface and is easy to use for management, observation and feeding. 20 centimeters from the bottom of the pool, two gas pipelines are installed, three air holes are drilled every 25 centimeters or so, and a heating boiler is installed in winter.
2. Dredging and deforestation: The wasteland blocks should be cleared of thick silt and turned to the sun. About 10 days before the seedlings are released, 250 kg of quick lime is used for every 0.067 hectare (mu).
3, transplanting plants: the pool of water, peanuts, bitter grass or put the willow root after sterilization, brown skin, etc., set attachments, conducive to crab shells, habitat. Water plants cover 40% to 60% of the surface.
4. Fertilizer Baits: One week prior to planting, 60-80 mesh sieves should be screened, water should be taken in 30 centimeters, 50kg of chicken manure should be applied per 0.067 hectare, and 5kg of urea should be used as a basic biofeed.
5, adjust the water temperature: the water temperature in the shed is generally 22-28 °C, crab seedlings into the shed when the water temperature and nursery crab pool temperature difference is not more than 3 °C is appropriate.
(b) Crab stocking
Generally every 567 hectares of crab seedlings 5-10 kilograms, require crab seedlings specifications, physical fitness, complete limbs. Before putting the seedlings into the water, sprinkle with water for 3-4 times or soak in the bath for 2-3 times, 1-2 minutes each time, and put them into the pool after adjusting to the environment. When laying the seedlings, they should be placed in shallow water and plants.
(III) Production Management
1. Regulate the water level: Within 15 days of putting the seedlings, the water level should be kept within 35 cm, and then gradually increase to 80 cm. In the middle and later stages of breeding, increase the amount of water exchange, and change the water daily by 50%-80%.
2, water quality control: the principle of fat, live, tender, cool, according to the water, timely change of water, maintain a transparency of 40-50 cm.
3. Feeding: The crabs are fed with eggs, milk powder and fish worms (copepods) for feeding for one week. The feeding rate is 150%-100% and the fish is fed directly to the fish or fish after phase III. . The feeding rate of II-III juvenile crab is 80%-50%, the bait rate is 30%-15% in IV-V phase, and the daily bait frequency is 5-7 times in I-II phase and 3-4 in II-III phase. Times, IV-V, once each morning and evening.
4. Disease prevention and treatment: Each 1/2-hectare will produce 5-10 kilograms of lime per 0.067 hectare, and mix 1 tert-butyl or oxytetracycline drug bait for 2-3 consecutive days; reduce the number of water changes in the shell stage.
5, daily management: often into the shed inspection, high temperature season, open the door from 9 am to 3 pm ventilation, oxygen, timely change of water.
(d) young crab out of the pool
Juvenile crabs are cultured for about 30 days, and their specifications can reach 2000-5000/kg. They can go out of the pond and use drainage collection, digging nets, and picking water to use nets. General growth rate of 20% -40%, 0.067 hectares of young crabs 80-120 kg.
Plastic sheds for young crabs
The cultivation of juvenile crabs in plastic greenhouses is the technical basis for the development of various models of crabs and is an important part of raising the survival rate of seedlings and the size of commodity crabs. The technical points are as follows:
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