A kind of high-efficiency river crab nursery integrated cultivation method
A breeding method and technology for river crabs, which are applied in application, climate change adaptation, fish farming, etc., can solve the problem that nutrition and water environment are difficult to meet the physiological and ecological needs of crab fry, the utilization efficiency of rotifer breeding pool is low, and the quality of crab fry is difficult. There are guarantees and other issues to achieve the effect of increasing the benefits of aquatic products, maintaining a good water environment for seedlings, and maintaining the speed of reproduction.
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Embodiment 1
[0018] Integrated cultivation of high-quality healthy crab seedlings, selection of seawater breeding nursery ponds with stable natural water temperature at 23°C, and use of crystal trichlorfon technical 3-4g / m 3 The clear pond kills harmful organisms, disinfects the water body after entering the water, releases river crab larvae after the drug effect disappears in the nursery pond, and releases the crab larvae at a density of 10,000 fish / m 3 , after the larvae are thrown in, the rotifers in the rotifer cultivation pond 3 are pumped out in circulation and filtered with a 200-mesh sieve, and fed into the river crab nursery pond 4 after concentration; the rotifer feeding density is 2-3 / ml , and maintain the density of rotifers; the rotifers are fed with Nitzia crescentus and microorganisms, and when feeding the rotifers, the water in the crescent rhombus culture pool 2 is directly fed by a water pump. This not only maintains the speed of reproduction of rotifers, but also improve...
Embodiment 2
[0020] The suitable area of the nursery pond is 5 mu, the water depth is 2 meters, and the effect of installing an aerator is better. Crescent algae cultivation pool 2 is suitable for an area of 1-3 mu, and the water depth is about 1 meter; the rotifer cultivation pool 3 is suitable for an area of 1-5 mu, and the water depth is 1 meter.
[0021] River crab larvae are placed in the river crab nursery pool 4, the natural water temperature of the nursery is 22-25°C, and the stocking density is 20,000 fish / m 3 , after the larvae are released, the rotifers are fed. The rotifers in the rotifer cultivation pool 3 are pumped out and filtered with a 250-mesh sieve, and fed to the river crab nursery pool 4 after concentration; the rotifer feeding density is 3-4 / ml, and keep the rotifers density. The rotifers are fed with Nitzia lunata, and the water is pumped out in the Nitztella crescentus cultivation pond 2, and fed into the rotifer cultivation pond 3.
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