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
摘要含肉率是克氏原螯虾的重要经济性状之一,与肌肉质量呈正相关。为鉴定与肌肉质量相关的体征性状,收集904尾野生克氏原螯虾(397尾雄性、507尾雌性),并根据体质量分别将雄、雌个体分成10、15、20、25、30、35、40、45 g 8个不同规格的群体。对各规格克氏原螯虾的螯质量、螯长、体质量、体长、肌肉质量(腹部肌肉)、含肉率(肌肉质量占体质量百分比)、头胸甲长与头胸甲宽性状进行测定。统计分析发现,除含肉率外的6个性状数值均随体质量增加而增加。同等规格的雌性个体的体长、肌肉质量与含肉率均极显著大于雄性;相反,雄性个体的螯长与螯质量极显著大于雌性。相关分析结果显示,在中等规格(25～35 g)和大规格(40～45 g)群体中,螯质量与含肉率呈极显著负相关。多元逐步回归分析与通径分析结果显示,螯质量与体质量分别对肌肉质量具有负向和正向直接作用。综上可知,降低螯质量是提高克氏原螯虾含肉率的重要育种策略。
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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2021, Vol. 40 
