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《Oceanologia et Limnologia Sinica》 2016-01
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DIFFERENCES IN QUANTITATIVE MORPHOLOGY OF MARSUPENAEUS JAPONICUS BETWEEN WILD AND CULTIVATED POPULATIONS OFFSHORE ZHOUSHAN, EAST CHINA

FU Yu;LI Hong-Peng;REN Su-Yi;WANG Zhi-Zheng;LING Zu-Hao;Zhejiang Ocean University;Shacheng Aquafarm,Daishan County;  
According to the fact that culture survival of autumn shrimp larvae of Marsupenaeus japonicus is significantly lower than the spring shrimp larvae and summer shrimp larvae, selecting autumn broodstock suitable for local offshore outdoor culture has become a great demand. We sampled 150 individuals each from wild and outdoor cultured-overwintered populations offshore Zhoushan, East China, from which 18 indices in quantitative morphology were studied statistically, to determine the differences between the two populations. Cluster, principal component, and discriminant analyses were conducted. The results show that the similarity index was only 11.11%, and the euclidean distance was 4.243(P0.01). The accumulative variance percentage of five principal components whose eigenvalues are larger than 1 reached 85.27%. The first principal components(PC 1) consisting of nutriture index, rostrum sawteeth numbers at superior margin, and abdominal muscularity level could be regarded as the tonicity factor. The PC 2 was predator-prey and movement related factors for searching food and chest size. The next three PCs were the factor for avoiding harm reflecting telson muscle level. In discriminant analysis, nine major contributors were used as independent variables for building Fisher discriminant functions, from which the two populations could be clearly separated, and the rates of discriminant accuracy for wild population was 99.33%(P1) and 96.13%(P2), and 96%(P1) and 99.31%(P2) for overwintered-cultivated population, respectively; and the comprehensive rate combined for both populations was 97.67%. Therefore, the selection of quantitative morphology indices for wild autumn broodstock should refer to those of an overwintered-cultivated population.
【Fund】: 舟山市海洋类科研攻关项目 2013C41013号;; 宁波市海洋渔业局科技项目“2015年宁波市本级增殖放流技术指导和效果评价”;; 宁波市科技富民计划项目“日本囊对虾生态高效养殖关键技术集成与示范(2016—2018)”
【CateGory Index】: S917.4
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