Experimental study on optimization of environmental factors in ecological aquaculture pond of Chinese mitten crab(Eriocheir sinensis)
Ecological culture in pond is the main mode of Chinese mitten crab(Eriocheir sinensis)breeding.To promote high-quality and high-efficiency of this crab's culture,five single factor experiments were conducted to optimize environmental factors in crab's ecological farming ponds in Gaochun,Jiangsu Province.The results showed that in the process of farming button crab to adult crab,after using bleaching powder to clear the pond,planting Elodea nuttallii and Hydrilla verticillate in circular furrow and paddy field,respectively,and stocking pond snails(Viviparidae,175～200 kg/667 m2)in Mid-April can significantly increase the coverage rate(Up to approximately 60％)of submergent macrophytes(Elodea nuttallii and Hydrilla verticillate)in pond,improve the water quality indicators of aquaculture(with a significant decrease in ammonia nitrogen),as well as significantly increase the survival rate of the crabs(P＜0.05);when the breeding density of button crab was about 1 000 ind./667m2,the best economic benefits were obtained;waterwheel aerator is the suitable oxygenation method,which can effectively stabilize the dissolved oxygen contents of ponds and improve the crab's anti-stress ability.
万方数据
维普
