Correlation and Path Analysis of Quantitative Traits of Different Months Diploid and Triploid Crassostrea angulata

In this paper, the effects of shell shape characters of diploid and triploid oysters populations of Crassostrea angulata at 18 and 27 months of age on body weight were studied, and the relationship between shell shape characters and body weight was clarified, which provided basic data for artificial breeding of polyploid oysters. Four quantitative traits（SH, SL, SW and TW）were measured in 50 diploid and triploid populations of oysters at 18 and 27 months of age. Correlation, multivariate regression, path and determinant coefficient were used to determine the effect of shell shape traits on body. The correlation results showed that the correlation coefficients between shell height and body of diploid population at 18 months and triploid population was the largest at 27 months, while the correlation coefficients between shell width and body weight of triploid population at 18 months and diploid population at 27 months were the largest. Path analysis results showed that shell height was the main factor affecting body weight at 18-month-old diploid and triploid populations, shell width at 27-month-old diploid population and shell height in 27-month-old triploid population. The result of the determination coefficient was consistent with the result of the path analysis. According to the results of multiple regression, four optimal regression equations of shell shape traits were established, and their correlation index R² was less than 0.850, indicating that there may be other factors that have a greater impact on the body.