Correlation Between Morphological Traits and Body Mass and Path Analysis of Epinephelus moara ♀ × Epinephelus lanceolatus ♂
To investigate the relationships between phenotypic traits at different growth stages of Epinephelus fuscoguttatus(♀)×E.tukula(♂),morphological traits such as body weight(Y),total length(Xi),body length(X2),head length(X3),body height(X4),body width(X5),caudal peduncle height(X6),eye diameter(X7),and head length behind the eyes(X8)were measured for individuals at 8,11,and 14 months of age.Correlation analysis,principal component analysis(PCA),and path analysis were conducted on the pheno-typic traits at different ages.The results showed that the optimal multivariate regression equations for body weight of Epinephelus fuscoguittatus(♀)×E.tukula(♂)at the three ages were as follows:Y8 morths=-188.404+13.099X3+20.491X5,Y11 months=-864.627+54.416X5+54.206X6;Y14 months=-837.373+33.211X3+55.331X4.All phenotypic traits at each age showed varying degrees of positive correlation with body weight,and the correlation between each morphological trait and body weight was highly significant(P＜0.01),ex-cept for head length,eye diameter,and head length behind the eyes at 14 months.The first principal component for both 8 and 11 months of age pointed towards growth and weight gain factors,while the first principal component for 14 months of age pointed towards growth,weight gain,and body height factors.The second principal component at all three ages was primarily related to height in-crease,growth,and weight gain factors.At 8 and 11 months of age,body width had the greatest direct effect on body weight(0.336 and 0.361,respectively),and at 14 months of age,body height had the greatest direct effect on body weight(0.608).The results of the determination coefficient analysis were consistent with the path analysis.In conclusion,Epinephelus fuscoguttatus(♀)×E.tukula(♂)at the three measured ages primarily focus on growth and weight gain,and the established multivariate linear regression equations can estimate the body weight of Epinephelus fuscoguttatus(♀)×E.tukula(♂)at different ages.
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