罗氏沼虾形态性状对体长影响的通径分析

doi:10.16378/j.cnki.1003-1111.20126

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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.

Key words： Macrobrachuim rosenbergii morphometric trait body length correlation analysis path analysis

Received: 15 June 2020

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	Articles by authors
	XIONG Zhaodi
	GAO Xiang
	DENG Pingping
	DAI Xilin

Cite this article:

XIONG Zhaodi,GAO Xiang,DENG Pingping, et al. Path Analysis of Effects of Morphometric Traits on Body Length in Giant River Prawn Macrobrachium rosenbergii[J]. Fisheries Science, 2022, 41(3): 417-423.

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https://www.shchkx.com/EN/10.16378/j.cnki.1003-1111.20126 OR https://www.shchkx.com/EN/Y2022/V41/I3/417

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