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| Path Analysis of Effects of Phenotypic Traits Attributes on Abdomen Meat Weight of Red Swamp Crayfish Procambarus clarkii |
| PENG Bo, TAN Yunfei, PENG Guohui, XIONG Lijing, BAI Xufeng |
1. National Key Laboratory of Crop Genetic Improvement, Shuangshui Shuanglü Institute, Huazhong Agricultural University, Wuhan 430070, China;
2. College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China;
3. Engineering Research Center of Green Development for Conventional Aquatic Biological Industry in the Yangtze River Economic Belt, Ministry of Education, Wuhan 430070, China |
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Abstract Abdomen meat percentage as one of the important economic traits for red swamp crayfish Procambarus clarkii is positively related with abdomen meat weight. To identify the phenotypic traits that can reflect abdomen meat weight, 904 samples of red swamp crayfish including 397 males and 507 females were collected, and divided into 8 different groups (body weight of 10 g, 15 g, 20 g, 25 g, 30 g, 35 g, 40 g and 45 g) for both sex based on body weight, respectively. Eight traits including chela weight, chela length, body weight, body length, abdomen meat weight, abdomen meat percentage, carapace length and carapace width were measured and statistically analysed. The results showed that six traits were increased with increase in body weight except for abdomen meat percentage. For the same body weight individuals, body length, abdomen meat weight and abdomen meat percentage of female were significantly more than those of male, but they were opposite to the traits of chela length and chela weight. There was a significantly negative correlation between chela weight and abdomen meat percentage in both medium individuals (body weight: 25—35 g) and large individuals (body weight: 40—45 g). Multiple stepwise regression and path analysis indicated that chela weight and body weight contributed the direct effects to abdomen meat weight, negatively and positively, respectively. Together these findings indicated that it was an important breeding strategy to improve abdomen meat percentage of red swamp crayfish by reducing chela weight.
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Received: 04 March 2020
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