%0 Journal Article
%T Mathematical analysis of effects of morphometric attributes on body weight for Penaeus vannamei<br>凡纳对虾形态性状对体重的影响效果分析
%A LIU Xiao-Lin
%A <br>刘小林
%J 生态学报
%D 2004
%I 
%X The effects of morphometric attributes on body weight for Penaeus vannamei were analyzed. Data for this study were collected from six-month-old 176 Penaeus vannamei in Banqiao Village of Dongfang City , Hainan Province. The body length ( X _1), carapace length ( X _2), carapace width ( X _3), carapace height ( X _4), number of upper frontal eminence spine ( X _5), number of lower frontal eminence spine ( X _6), tail length ( X _7) and body weight (Y) were measured. The correlation coefficients among the attributes were calculated. Tail length was eliminated from the variable data set because it was co-linear with body length ( X _1) and carapace length ( X _2). The first 6 morphometric attributes( X _1~ X _6) were used as independent variables, and body weight( Y ) was used as a dependent variable for path analysis. Path coefficients ( Pi ), determination coefficients ( di) and correlation index ( R ~2) were calculated in path analysis. The results showed that all five correlation coefficients between each morphometric attribute and the weight (0.9446, 0.9262, 0.9102, 0.7923, 0.933) achieved very significant difference ( P <0.01) levels. The path coefficient analysis revealed a truthful relationship between the independent variables and the dependent variable. The path coefficients( Pi ) of the body length ( X _1), carapace length ( X _2), carapace width ( X _3) and number of lower frontal eminence spine ( X _6) to the body weight have all reached a level of significance. These attributes are very indicative of determining the body weight, among them body length ( X _1) weighted the most ( P _1=0.428) to the body weight, it is a key effective factor, carapace length ( X _2) and carapace width ( X _3) weighted the second and third ( P _2=0.2902, P _3=0.2453, significant indirect effect 0.6145, 0.6408 respectively). The number of lower frontal eminence spine ( X _6), carapace height ( X _4), number of upper frontal eminence spine ( X _5), and tail length ( X _7) have insignificant direct effect on the body weight and were neglected. The diversification of determination coefficients ( d_i ) is consistent with that of path coefficients( P_i ). Judging from the result of high correlation index ( R ~2=0.921), the main variables ( X _1, X _2, X _3, X _6) have been selected. The multiple regression equation of the body length ( X _1), carapace length ( X _2), carapace width ( X _3) and number of lower frontal eminence spine ( X _6) to the body weight is obtained to estimate body weight. the regression intercept and partial regression coefficients of the equation are -17.994, 1.477, 4.159, 6.197, and 0.4757. This paper provide a theoretical tool to measure breeding shrimps in aquaculture.
%K Penaeus vannamei
%K morphometric attribute
%K correlation analysis<br>凡纳对虾
%K 形态性状
%K 生产性能
%K 相关分析
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=FE163E5DB2274E5937319DE98913EC37&aid=904FF19BF38B0341&yid=D0E58B75BFD8E51C&vid=B91E8C6D6FE990DB&iid=E158A972A605785F&sid=E002FF26604EFFAB&eid=65A51D0EBEB846F5&journal_id=1000-0933&journal_name=生态学报&referenced_num=38&reference_num=18