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COMPARISON IN THE EFFECT OF MORPHOLOGICAL TRAITS ON BODY WEIGHT AND MEAT WEIGHT OF MARSPENAEUS JAPONICUS FROM WILD AND OVERWINTERED CULTIVATED GROUPS IN ZHOUSHAN OFFSHORE REGIONS
Author(s): 
Pages: 1218-1227
Year: Issue:  5
Journal: Oceanologia et Limnologia Sinica

Keyword:  Marspenaeus japonicuswild groupoverwintered cultivated groupmorphological traitsbody weightmeat weightmultiple regressionmultivariate analysis;
Abstract: We sampled 150 Marspenaeus japonicus from wild and overwintered cultivated groups, and 16 phenotypic traits were measured, namely, body weight(Y1), meat weight(Y2), body length(X1), carapace length(X2), chest width(X3), breast height(X4), second abdominal segment length(X5), second abdominal segment width(X6), second abdominal segment height(X7), telson length(X8), telson width(X9), telson height(X10), diameter of eye(X11), distance of eye socket(X12), rostrum length(X13), and rostrum sawteeth numbers at superior margin(X14). Correlation analysis, path analysis and partial regression analysis were used to study the effect of morphological traits on body weight and meat weight of M. japonicus from the two groups. The results indicate that all the correlation coefficients between each morphological traits, and body weight and meat weight were extremely significant(P<0.01) except X14. The correlation indexes of the reserved morphological traits on body weight and meat weight in wild group were 0.944 and 0.837, respectively, and the correlation indexes of the reserved morphological traits on body weight and meat weight in cultivated group were 0.955 and 0.907, respectively through the path analysis. The key variable to affect the body weight and meat weight in the cultivated group were both X1, and the importance degree is in the order of X1>X2. The key variable to affect the body weight and meat weight in the wild group were X1, and X2, respectively, and X6 was important for both groups. Multiple regression equations used to estimate body weight, and meat weight of wild group were Y1=0.152X1+0.217X3+0.439X6+0.327X9–0.100X13– 12.456, and Y2=0.129X2+0.155X3+0.17X6+0.184X11–0.078X14–4.267, respectively. Similarly, multiple regression equations used to estimate body weight, and meat weight of overwintering cultivated group were Y1=0.180X1+0.228X2+0.129X4+ 0.287X6+0.330X9+0.412X10–0.371X12–20.677, and Y2=0.127X1 +0.253X6–0.276X12–9.972, respectively.
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