中华绒螯蟹长江种群与辽河种群-龄阶段的成活率与生长性能比较

采用完全随机区组设计，对中华绒螯蟹长江种群与辽河种群在一龄阶段的成活率和生长性能进行了比较试验。对两种群群各生长月份的体重、壳长和壳宽等数据进行线性模型方差分析。结果表明：（１）长江种群与辽河种群的成活率和增重率差异不显著（Ｐ〉０．０５）。（２）长江种群与辽河种群各月份生长差异不显著（Ｐ〉０．０５），月份间的生长差异均极显著（Ｐ〈０．０１）；两种群雄性月平均体重均高于雌性，但差异不显著（Ｐ〉０．０５）。（３）两种群个体生长差异明显，变异系数达４０以上，长江种群的系数高于辽河种群，但差异不显著（Ｐ〉０．０５）。

Comparison on survival rate and growth of juvenile crab of Yangtze population and Liaohe population

A completely randomized block designed experiment and mixed linear model were used to evaluate the survival and growth of mitten crab of Yangtze population and Liaohe population at juvenile stage. The results indicated that: (1) The survival rate and weight increasing rate of Yangtze population were slightly higher than those of Liaohe population, but there were no significant difference(P>0.05). (2)The result of linear model revealed that monthly growing rate was no significant difference between Yangtze population and Liaohe population. Although significant differences didn't exist between male and female crab, monthly growing rate of male crab were always higher than that of female crab. (3) the variation of body weight of two populations among individuals were very large(more than 40), and the variation of Yangtze population was slight higher than that of Liaohe population, but no significant difference was found(P>0.05).