密度、营养与河蟹蟹种生长及性早熟之间的相关关系

Co relation between Density Netrition and Growth Prematuration of Young Mitten Crab

设计４个不同密度组和以动、植物性饲料饲喂的２个组，在２０．８～３０．４℃自然水温下饲养１１９ｄ。方差分析的结果表明，蟹种的个体生长率随放养密度的递增而下降，组间差异极为显著（Ｐ＜０．０１），性早熟比例与密度递增组间差异不明显；单一饲料，即植物性或动物性饲料，对生长发育不利，对降低性早熟比率也不利。每千平方米放养０．９ｋｇ大眼幼体有利于控制河蟹性早熟。

Four testing groups with different stoching densities and two groups fed with animal or vegetable diets respectively were designed. Young crabs were reared under natural water temperature of 20.8～30.4℃ for 119 days. Results of variance analysis showed the individual growth rate of crab decreased with the increase of stocking density and the difference was quite significant ( P<0.01 ). Ratio of pre maturation was not obviously related with stocking density. Single diet, be it animal one or vegetable one was harmful to the growth and development of crab and was unfavourable to the reduction of pre maturation ratio . It was suggested to stock 0.9 kg of young crab per kito m 2, which was favourable to the contral of pre maturation of crab.