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Chinese Agricultural Science Bulletin ›› 2025, Vol. 41 ›› Issue (35): 140-146.doi: 10.11924/j.issn.1000-6850.casb2024-0745

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Path Analysis of Relationship Between Phenotypic Traits and Soft Body Weight Among Three Lines of Pearl Oyster Pinctada fuctada martensii

LI Siyun(), YANG Chuangye, LIAO Yongshan, LI Junhui(), DENG Yuewen   

  1. Fishery College, Guangdong Ocean University, Zhanjiang, Guangdong 524088
  • Received:2024-12-09 Revised:2025-03-24 Online:2025-12-11 Published:2025-12-11

Abstract:

The study analyzed the morphological traits and body weight of the three lines of pearl oyster Pinctada fuctada martensii, and established the linear equation with the soft body weight and the main target traits, with an aim to provide useful information for the breeding of the species. The three lines were involved in the progeny stock with breeders introduced from Vietnam, the line with black radiating rib as morphological marker in the shell surface, and the control stock. In December 2023, 300 samples were collected from each of three lines. Shell height (SH), shell length (SL), shell width (SW), stranded line length (TWL), live total weight (LW) and soft body weight (MW) of each sample was measured, and the correlation coefficient between traits were estimated. The correlation coefficients between each trait were calculated with the shell phenotypic trait as the independent variable and the soft body weight as the dependent variable. The direct path coefficient and the indirect path coefficient between each trait were also calculated. The results showed that shell height, shell length, shell width, stranded line length, total weight and soft body weight of the three strains were highly significant correlated (P<0.01). All three strains had the largest direct effect of total weight on soft body weight. Three multiple regression equations were established by using stepwise regression analysis. The regression equations of progeny stock with breeders introduced from Vietnam, the line with black radiating rib as morphological marker in the shell surface, and the control stock were Y=-2.973+0.034XSH-0.043XTWL+0.235XLW, Y=-0.505+0.253XLW+0.037XSW, and Y=-5.557+0.094XSH+0.265XLW, respectively. The results show that total weight is the most important factor affecting the quality of soft body weight, which is helpful for the cultivation of the lines with larger soft body weight.

Key words: Pinctada fuctada martensii, selected lines, morphological traits, soft body weight, path analysis