长江中游三个湖泊中华绒螯蟹生长变化研究

选择长江中游的牛山湖、武湖和东汤逊湖三个典型的河蟹养殖湖区作为研究地点,从2009年2月起逐月调查湖泊放流河蟹体重和壳宽的生长变化,并同时记录投喂管理情况和收集试验湖区的水化特征及底栖生物资源状况。调查发现,河蟹在4、5、6月特定生长率最大,此时为河蟹生长的高峰期。在三个湖区间,生长有显著性差异,在收获季节,武湖河蟹的平均壳宽和体重均显著性大于另外两个湖区(P<0.05),牛山湖和东汤逊湖之间则无显著性的差异(P>0.05);这种情形可能主要与为湖泊的天然饵料资源的种类和丰度有关。

Growth changes of stocked Chinese mitten crab (Eriocheir sinensis) in lakes along the middle reach of the Yangtze River

Niushan Lake,Wuhu Lake and East Tangxun Lake along the middle reach of Yangtze River were selected as research sites.During the period of February to October in 2009,we investigated the weight and carapace width of stocked Chinese mitten crab in these three waters monthly,and collected the data of feeding management,the characters of water quality and density and biomass of zoobenthos in the three lakes.The results showed that April,May,Jun are very critical period for growth of Chinese mitten crab and with most quickly growing.There were significant differences among the three waters on growth.At harvest time,mean weight and carapace of the stocked crabs were higher in Wuhu Lake than the other two waters(P<0.05),and there were no significant differences between the Niushan Lake and the East Tangxun Lake(P>0.05).Growth may be affected by the natural food resource.