Effects of Morphological Traits on Body Weight of Sillago Sinica in Zhoushan Offshore Based on Path Analysis and Grey Relational Analysis
In order to study the relationships between morphological traits and body weight of Sillago sinica,107 samples in the offshore of Zhoushan were randomly selected,and their body weight(X0)and 11 morphological traits including snout length(X1),head length(X2),body length(X3),total length(X4),caudal peduncle length(X5),caudal peduncle height(X6),body thickness(X7),eye diameter(X8),interorbital diameter(X9),head length behind eyes(X10)and body height(X11)were measured and analyzed by correlation analysis,multiple regression analysis,path analysis and grey relational analysis.The correlation analysis results showed that all the morphological traits were significantly correlated with body weight(P＜0.01),and the correlation coefficient between body length and body weight was the greatest of all.After eliminating the severe collinearity effects,two indexes(body length and caudal peduncle height)that significantly linearly correlated with body weight were considered as the independent variables,and body weight was regarded as the dependent variable.The optimal multiple linear regression equation was finally constructed as:Y=-87.734+6.174X3+24.398X6.The path analysis results revealed that body length had the largest direct effect on body weight,while caudal peduncle height had the largest indirect effect on it.The top five grey relational degrees between each morphological trait and body weight were body length,total length,caudal peduncle height,body height,and head length.Comprehensive findings indicated that during the process of Sillago sinica fishery resource development and management,body length and caudal peduncle height should be separately used as the priority measure index and auxiliary one to formulate the optimal catchable size and mesh size.
万方数据
维普
