Correlation and Path Analysis of Growth Traits of Jellyfish Rhopilema esculentum in a Pond Culture
CHEN Bailing1, ZUO Huinan2, ZHOU Zunchun1, LI Yulong1, WANG Shengxin2, JIN Chenglong3, TIAN Meilin1, BAO Xiangbo1, LI Yunfeng1
1. Key Laboratory of Protection and Utilization of Aquatic Germplasm Resource, Ministry of Agriculture and Rural Affairs, Liaoning Ocean and Fisheries Science Research Institute, Dalian 116023, China; 2. Key Laboratory of Mariculture and Stock Enhancement in North China′s Sea (Ministry of Agriculture and Rural Affairs), Dalian Ocean University, Dalian 116023, China; 3. School of Life Science, Liaoning Normal University, Dalian 116029, China
Abstract：To investigate the relationship between body weight and morphological traits in jellyfish Rhopilema esculentum, body weight (y), umbrella arc length (x1), body height (x2), and oral arm length (x3) were measured in 367 samples collected from the same batch in the aquaculture ponds (9.2 hm2) of Huangtukan Farm in Dandong city, Liaoning province, and a regression equation between morphological traits and body weight was established by correlation and path analyses. The results showed that body weight exhibited the maximal coefficient of variation (28.72%), showing the most selective potential. All pairwise correlations among four growth traits were significantly positive (P<0.01), with the maximal correlation (0.939) between body weight and umbrella arc length. Among the three morphological traits, the maximal determination coefficient (0.362) and direct path coefficient (0.602) on body weight were found to be the umbrella arc length, the predominant morphological trait affecting body weight. A multiple regression model was established with body weight (y) as the dependent variable and umbrella arc length (x1), body height (x2), and oral arm length (x3) as independent variables: y=-8.322+0.194x1+0.120x2+0.093x3 (r2=0.916). The multiple regression model exhibited better fitting effect and explanatory power, which can be applied in practical production. These findings provide critical theoretical guidance for selective breeding of superior varieties in the jellyfish.
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2025, Vol. 44 
