Path Analysis of Effects of Morphometric Traits on Body Length in Giant River Prawn Macrobrachium rosenbergii
XIONG Zhaodi1, GAO Xiang1, DENG Pingping2, DAI Xilin3
1. Shanghai Vocational College of Agriculture and Forestry, Shanghai 201699, China; 2. Shanghai Fisheries Research Institute, Shanghai 200433, China; 3. Shanghai Ocean University, Shanghai 201306, China
Abstract：In order to explore the effect of morphological characteristics of giant river prawn Macrobrachium rosenbergii on body length, 391 individuals of five-month-old prawn were randomly sampled, ten morphometric characters such as total length, body length, carapace length, carapace width, first segment length and second segment width were measured. After correlation analysis and path analysis, the correlation coefficient, path coefficient, determination coefficient and common determination coefficient among various morphological traits were calculated; the morphological traits with significant path coefficients were selected to calculate the complex correlation index to determination the key morphological traits that affect body length; finally, the stepwise regression analysis equations for morphological traits were established to estimate body length. The results showed that the correlation coefficients between the measured morphological traits and body length had very significant level (P<0.01); the correlation coefficients between total length and body length, path coefficients, and determination coefficients were all the maximam; the regression coefficient of equations reached the significant level (P<0.05), r2=0.958; except that the partial regression coefficients of the first segment length and second segment width were significant (P<0.05), the partial regression coefficients of other traits reached very significant levels (P<0.01). It was seen that the total length was the most important morphological trait that affected the body length. The second segment width and sixth width segment had significant direct effect on the body length; and total length, second segment width and sixth width segment as a directional breeding index, which were applied to the production practice of establishing a fast-growing specialized strain of giant river prawn.
熊昭娣, 高翔, 邓平平, 戴习林. 罗氏沼虾形态性状对体长影响的通径分析[J]. 水产科学, 2022, 41(3): 417-423.
XIONG Zhaodi, GAO Xiang, DENG Pingping, DAI Xilin. Path Analysis of Effects of Morphometric Traits on Body Length in Giant River Prawn Macrobrachium rosenbergii. Fisheries Science, 2022, 41(3): 417-423.
2022, Vol. 41 
