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| Comparative Growth Traits in Different Families of Juvenile Chinese Mitten Handed Crab, Eriocheir sinensis,Cultured in Net Cages Disposed in Ricefields and in an Indoor Tank |
| HU Qingbiao,LI Xiaodong,JIANG Yusheng,SI Yongguo,ZHENG Yan,SUN Na |
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Abstract Megalopa larvae of A ,B and C families of Chinese mitten handed crab (Eriochier sinensis) were reared in a 40 m2 net cage (6 .50 m × 6 .15 m) at a stocking density of 2500 individuals per cage in early June of 2015 .Some of the juveniles were randomly sampled from the net cages and comparatively reared in an indoor 300 L tanks at a stocking density of 30 individuals per tank later July of 2015 .Carapace width ,car‐apace length and body weight reared in the juveniles in the ricefields and in an indoor tank were measured in a some 15 day interval from August to October in 2015 ,and the data above were analyzed by multiple a‐nalysis of variance and repeated measures analysis of variances from environmental factor ,family factor and the growth traits .The results showed that there was no significant influence of rearing environmental factor on the grow th traits in the crab juveniles in family A (P>0 .05) ,with very significant influence on those in family B(P<0 .01) ,and significant influence on those in family C (P<0 .05) except for at the be‐ginning period of growth(P>0 .05) ,indicating that the juveniles in family A had a certain environmental adaptability .Meanwhlie ,family factor was found to have significant effects on growth traits of the crab ju‐veniles in different periods(P<0 .05) ,which shows that heredity plays an important role in the growth of crab juveniles .The correlation analysis of rearing environments revealed that there was very significant positive correlation between growth traits (carapace width and carapace length) and rearing environment , with correlation coefficients of 0 .314 and 0 .305(P<0 .01) ,and no significant correlation with the body weight (r=0 .146 ,P>0 .05) .The findings indicate that the offspring will have a certain adaptation when carapace width and carapace length are chosen as selection indices in two different rearing environments .
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Received: 25 May 2016
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