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河蟹养殖是近几年发展迅速的水产养殖事业,随着养殖单位和面积的猛增,对幼蟹和蟹种的需求量也随之增加.70年代实施直接投放蟹苗的养殖方法,成蟹的回捕率较低(一般在5%-7%),主要原因是蟹苗(大眼幼体)至幼蟹期的死亡率高.为了解决这一难题,一些地区采用将蟹苗暂养成Ⅱ、Ⅲ期幼蟹的养殖技术,这就需要根据蟹苗摄食方式及营养需要选择优质、完善的饵料以提高蟹苗暂养成活率.本试验的目的是研究天然饵料中添加一定水平的添加剂是否能提高蟹苗暂养成活率.
Crab farming is a rapidly growing aquaculture business in recent years, with the breeding units and area soared, the demand for juvenile crabs and crabs also increased.During the 1970s, the direct use of crab farming methods, crabs (5% -7%), the main reason is the high death rate from crabs (big eyes) to juvenile crabs.In order to solve this problem, some areas adopt the method of temporarily raising crabs Ⅱ, Ⅲ crab breeding techniques, which need to feed according to crab feeding and nutrition needs to select high-quality, perfect feed to improve the survival rate of crab nursery sustenance.The purpose of this experiment is to study the natural diet add a certain level of Additives can improve the survival rate of crab seedlings.