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目前,我国河蟹养殖周期一般为两年,即当年将大眼幼体培养成60—200只/公斤的扣蟹,第二年再将扣蟹养成商品蟹。采用温水强化培育幼蟹技术可以提高河蟹成活率,使幼蟹提前放养,增加河蟹生长时间,当年即可育成100克/只以上的商品蟹。 早期幼蟹培育是在增温条件下实现的,增温方式有塑料大棚、工厂余热水、深井水、锅炉加温等,而最适宜在广大农村推广应用的是塑料大棚培育技术。 一、大棚建设 修造东西向,长20—50米、宽5—8米、深0.8—1.2米的土池,坝高1米左右,坝顶宽约1米,底宽约2米,夯实加固。 池中打入三排细木桩,中间一排露出池底2.5米,其它两排露出池底2米。也可以只用两排木桩,均露出池底2米。用铁丝在距池底0.75米处扎上横木,上铺跳板,供人行走投饵、察看棚内情况。在各
At present, the crab breeding cycle of our country is generally two years, that is, the large-eyed larvae were cultured to 60-200 / kg of crabs, and the second year, the crabs are further developed into commercial crabs. The use of warm water to strengthen the culture of young crabs can improve the survival rate of crabs, crabs stocking in advance to increase the growth of crabs, the year can be bred 100g / only more than commercial crabs. Early crab cultivation is achieved under the condition of increasing temperature. There are plastic greenhouse, factory hot water, deep well water, boiler heating, etc., and the most suitable in the vast rural areas to promote the application of plastic greenhouse cultivation techniques. First, the construction of greenhouses east-west building, 20-50 meters long, 5-8 meters wide, 0.8-1.2 meters deep soil pool, about 1 meter high dam, dam width of about 1 meter, bottom width of about 2 meters, solid reinforcements. Pool into the three rows of fine stakes, the middle row of 2.5 meters revealing the bottom of the pool, the other two rows reveal the bottom 2 meters. Can also only use two rows of stakes, are exposed 2 meters bottom. With wire in the 0.75 meters from the bottom of the pool tied bar, top springboard for people to feed, observe the shed situation. In each