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| Effect of Morphological Traits on Body Weight in Clam Paphia schnelliana |
| WEI Haijun1,2,3, DENG Zhenghua1,2,3, CHEN Mingqiang1,2,3, LI Youning1,2,3, WANG Yu1,2,3, SUN Jing1,2,3, WANG Jijin4 |
1. Key Laboratory of South China Sea Fishery Resources Development and Utilization, Ministry of Agriculture and Rural Affairs, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China;
2. Sanya Tropical Fisheries Research Institute, Sanya 572018, China;
3. Tropical Aquaculture Research and Development Centre, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Sanya 572018, China;
4. Beihai Jinbuhuan Aquatic Products Co., Ltd., Beihai 536007, China |
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Abstract Shell length, shell height, shell width, anterior length, posterior length, and body weight were measured and the number of growth lines were recorded in 339 samples of wild clam Paphia schnelliana collected from Beibu Gulf in October 2019, and correlation between morphological trait and body weight was analyzed by correlation analysis, multiple stepwise regression analysis and path analysis in order to explore the effect of morphological traits on body mass. The results showed that the clam had growth lines of 36.4±3.2, with the maximal variation coefficient of body weight, significantly correlated with all the morphological traits, and the maximal correlation coefficient (0.949) with shell height, and the minimal correlation coefficient (0.759) with posterior length, indicating that the body weight had the greatest breeding potential. The stepwise regression analysis revealed that the most important morphological trait affecting the body weight was the shell length, followed by shell height and shell width, and the regression equations of shell length, shell height and shell width on body weight was established (r2=0.965). The path analysis showed that the shell width had the greatest impact on the body weight, followed by the shell height and shell length. The findings indicated that the shell width was selected mainly, and that the synergistic selecting of the shell height was strengthened at the same time selective breeding of body weight in clam P. schnelliana.
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Received: 18 December 2019
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