The Main Technical Measures of White Shrimp Cultured in Three Crabs
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1. Ponds: The area is suitable for 10 mu and is easy to operate. The depth of pool is 1.5-2 meters, and the circumference is 4 meters wide and 0.8-1.2 meters deep. The soil is muddy. The breeding pond has a breakwater.
2. Supporting Facilities: One 2.2-kw aerator per 10 mus, preferably in combination with microporous oxygenation. The aquaculture pond has an independent water intake and drainage system. With easy access to the pond, it operates, discharges fresh water pipelines and circuits, and ensures the production of water and electricity. Various operating tools are equipped.
3. Water source: The flow of the aquaculture intake is smooth and pollution-free. The large tides can naturally enter the water, and the small tides can mechanically carry water with a salinity of 15-28 ‰ and meet the requirements of GB11607.
Second, prepare before breeding
1. Clear pond: Every winter and spring will be reconstructed to thoroughly remove debris from the ground and silt at the bottom of the pond. Then the pond surface will be ploughed 10-20cm. After exposure, freezing and weathering, the mud will be broken and broken. , Renovation of pools, channels, gates, etc.
2. Disinfection: One month before the seedlings injection, 300 kg of pulp per acre shall be sprayed evenly, or 300 ppm of bleaching powder shall be sprayed completely to leave no dead ends to thoroughly kill harmful organisms such as bacteria and viruses.
3. Influent: 15-20 days before seedling, use 80-mesh screen to inject water at high tide. The depth of water injection is 50-60cm, and the salinity is maintained above 18‰.
4.Fertilizer: Normally, 2 kg of nitrogen fertilizer (urea) and 500 kg of swine manure or 100 kg of chicken manure are fully fermented and disinfected. After 7-15 days, the water is pale brown or yellow-brown, and the monocyanobacteria reaches a certain density. Zooplankton began to multiply, providing a good ecological environment for the entire aquaculture production.
Third, the stocking density
1. Triptych crab young crabs, specifications 4500-5000/kg, 0.5 kg per mu. The seedlings are juvenile crabs cultivated in earthen ponds in early July in late July.
2. The ridge-tailed white shrimps were held in mid-July and put 1 kg of broodstock on the sea per mu.
Fourth, feed feeding technology
Swallow crabs are dominated by animal foods, and white tailed lobsters are omnivorous. The variety of bait is determined by crabs. Feeding adhere to the "four principles" principle:
1. Quantitative feeding should be based on water temperature, water quality, climate, total amount of shrimps and crabs, feeding or strength, and residual baits. For feeding animal diets, before the fifth crabs, the amount of bait is 100-200% of the body weight of the crabs. When the crabs weigh 50 grams, the amount of bait is 10-15% of the body weight of the crabs, and the latter is 80%. about. It is generally appropriate to eat after about 3 hours after feeding.
2, regular time each morning and evening feeding 1 time, 8-9 hours in the morning to feed, accounting for 30% of the daily feeding amount, feeding around 18 o'clock in the evening, accounting for 70% of the daily feeding amount.
3, positioning bait put in shallow water near the pond surface, feeding should be uniform, as far as possible so that the shuttle solution scattered feeding, to prevent fighting.
4, the quality of animal food to ensure fresh, not degenerate, free from pollution, granular food to nutrition comprehensive.
V. Disease Prevention
In the early stage, EM preparations were mainly used. Use ciliary net before winter.