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| Correlation Analysis of Morphometric Traits on Body Weight in Guanghe Breeding Strain of Chinese Mitten Crab Eriocheir sinensis |
| ZHENG Yan, LIU Xu, SUN Na, GENG Dan, LI Yang |
| Liaoning Provincial Key Laboratory of Chinese Mitten Handed Crab Eriocheir sinensis Breeding, Panjin Guanghe Crab Industry Co., Ltd., Panjin 124200, China |
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Abstract Carapace length (x1), postcarapace length (x2), body height (x3), frontal width (x4), first side tooth width (x5), meropodit length of the third periopod (x6), propodit length of the third periopod (x7), dactylopodit length of the fourth periopod (x8) and body weight (y) were measured in 500 samples, 250 females [(95.27±14.60) g] and males [(145.03±23.46) g], of adult Guanghe breeding strain of Chinese mitten crab Eriocheir sinensis collected from Panjin Guanghe Crab Industry Co., Ltd., Panjin, China. The correlation coefficient, path coefficient, and determination coefficient of body weight with morphological traits as independent variables were calculated by correlation analysis and path analysis, and then the influence of each trait was divided. The results showed that there was the maximal coefficient of variation in body weight, 16.17% for male and 15.32% for female, among the all parameters in Guanghe breeding strain of Chinese mitten crab, showing great potential for selection by body weight in each morphological trait. The maximal correlation coefficient, 0.830 for male and 0.893 for female, was observed between carapace length and postcarapace lengtht among the all traits. Among the correlations between various morphological traits and body weight, the correlation coefficient of the carapace length was the largest, 0.806 for male and 0.954 for female. There was greater indirect impact of all morphological traits on body weight than the direct impact of all morphological traits on body weight, with the descending order of indirect effects on body weight as x1>x4>x3>x6 in male, and x1>x3>x6>x4 in female. Carapace length was the most important factor determining body weight in each morphological character, 32.1% for male and 53.8% for female. The propodit length of the third periopod and the carapace length showed the greatest synergistic effect on the body weight, 20.2% for male and 14.8% for female. The x7 and x1 were important decisive indicators for body weight, with the optimal regression equation between body weight and morphological characters as y=-224.598+3.826x1+1.846x6+2.866x4+2.14x3 in male, and y=-166.408+3.734x1+0.754x6 +0.817x3-1.014x4 in female.
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Received: 31 March 2020
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