Correlation and Path Analysis of Morphological Traits on Body Weight in Different Populations of Pearl Oyster Pinctada fucata martensii
BAI Ke1,2, ZHANG Xingzhi2, GUAN Junliang2, HE Pingping2, WEI Pinyuan2, ZHANG Li2, LI Wei2, ZHENG Yusi2, CHEN Yongxian2, HU Na2, PENG Jinxia1,2, ZHU Peng1
1. College of Oceanography, Beibu Gulf University, Qinzhou 535011, China; 2. China(Guangxi)-ASEAN Key Laboratory of Comprehensive Exploitation and Utilization of Aquatic Germplasm Resources, Ministry of Agriculture and Rural Affairs, Guangxi Zhuang Autonomous Region Academy of Fishery Sciences, Nanning 530021, China
Abstract：To investigate the effects of shell morphological traits on body weight traits in different populations of pearl oyster Pinctada fucata martensii and to provide theoretical basis for selective breeding, three shell morphological traits including shell height (h), shell length (L), shell width (b) and two body weight traits including soft body weight (m1) and live body weight (m2) were measured in the cultured, nucleated, and wild populations of pearl oyster. The relationships between shell morphological traits and body weight traits were analyzed using multiple regression, correlation, and path analysis across various populations. There were significant differences in soft body weight and shell width index(P＜0.05)among the three populations, especially, with the maximal soft body weight of 26.05％ in the cultured population, and the maximal shell width index of 0.154 in the nucleated pearl oyster population. Correlation coefficients between shell height, shell length, and shell width to soft body weight and live body weight were shown to be significantly correlated(P＜0.05)across all three populations. Shell height was identified as the primary determinant of soft body weight in all populations. In the case of the nucleated pearl oyster population, shell width was the main factor affecting live body weight. Shell height was found to be the predominant factor influencing live body weight in both the cultured and wild populations. Optimal regression equations were expressed as: the cultured population m1 =-14.230+ 0.312h+0.041L+0.051b, the cultured population m2 =-37.893+0.926h+0.094L+0.183b; the nucleus insertion population m1 =-6.044+0.016h+0.213b, the nucleus insertion population m2 =-23.324+0.254h +0.634L+0.306b; the wild population m1 =-27.035+0.258h+0.643b, the wild population m2 =-154.107+ 0.990h+0.718L+3.740b using multiple regression analysis for the quantitative traits of pearl oysterin different populations. The findings provide reference with selective breeding of growth traits in P. fucata martensii.
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2025, Vol. 44 
