Analysis of Effects of Morphological Traits on Body Weight of Spotted Sea Bass (Lateolabrax maculatus)
In order to understand the effects of morphological characters on the body weightof spotted sea bass (Lateolabraxmaculatus),we selected 105 L.maculates and measuredtheir morphological indexes including interorbital width (X1),body width (X2),snout length (X3),head length (X4),trunk length (X5),caudal peduncle length (X6),head height (X7),body height (X8),caudal peduncle depth (X9),standard length (X10),total length (X11) and body weight (Y).We identified the optimal models for reflecting the relationship of each morphological trait and body weight for spotted sea bass by model fitting screening.The correlation coefficient,the diameter coefficient,the coefficient of determination and the correlation index of the main morphological traits were calculated by correlation,path and multiple regression analyses in order to determine the main morphological characters which affectthe body weight,and establish the best regression equation to do quantitative analysis of the effect of each morphological trait on body weight.Results showed that the best determination coefficient for body width,body height,standard length and total length against body weight was R2＞0.85.The equations arey=0.045x2.459,y=-1059.959+20.392x,y=4.8×10-5x2.785 and y=8.42× 10-5x2.616.Therelationship between morphological traits and body weight was obtained.The results of path analysis showed that the coefficient of variation of body weight was the largest (19.770％),and that between morphological traits and body weight was extremely significant (P＜0.01).In the path analysis,head height,body height and standard length were flound to be multiple collinear with total length and interorbital width;snout length,trunk length and caudal peduncle length were not significant in the regression equationthusremoved.Finally,body width,head length,total length and caudal peduncle depth were retained and the body width had the greatest direct effect on body weight(P2 =0.547).The correction correlation index was R2 =0.954,indicating that these four selected morphological indexes were the main characters contributing to body weight.The final established multiple regression equation based on the stepwise multiple regression analysiswas Y=-906.939+16.033X2 +2.199X4 +0.773X11 +6.127X9.The results will provide a scientific basis for breeding spotted sea bass.
国家科技期刊平台
NSTL
万方数据
维普
