作 者：
肖炜;李大宇;邹芝英;祝璟琳;乐贻荣;韩珏;杨弘
单 位：
中国水产科学研究院淡水渔业研究中心农业部淡水鱼类遗传育种和养殖生物学重点开放实验室
关键词：
尼罗罗非鱼(Oreochromis niloticus);相关分析;通径分析;形态性状;多元回归分析
摘 要：
随机取埃及品系尼罗罗非鱼(Oreochromis niloticus)幼苗119尾,通过RFID电子标记注射和对体重、全长、体长、体高、头长、尾柄长、尾柄高、体宽共8个可量性状进行跟踪测量,运用相关分析和通径分析计算形态性状对体重的相关系数、通径系数和决定系数,最终建立体重的回归方程。结果显示:2-13月、14-25月两个生长阶段埃及品系尼罗罗非鱼7个形态性状与体重的相关系数均达到极显著水平(P<0.01);通径分析显示埃及品系尼罗罗非鱼2-13月生长期间全长、体高、体宽3个变量对体重的通径系数达到显著水平,通径系数依次为0.417、0.339、0.212,应用逐步多元回归分析建立全长(VTL)、体高(VBD)、体宽(VBWD)对体重(VBW)的回归方程VBW=-307.492+13.667VTL+29.638VBD+3.545VBWD,方程相关指数为0.862;14-25月生长期间体高、全长2个变量对体重的通径系数达到显著水平,通径系数依次为0.550、0.387,应用逐步多元回归分析建立体高(VBD)、全长(VTL)对体重(VBW)的回归方程VBW=-68.559+82.443VBD+22.717VTL,方程相关指数为0.784。研究表明2-13月、14-25月两个生长阶段埃及品系尼罗罗非鱼决定体重增长的形态性状会发生改变,因此建议在不同生长时期针对性地筛选、使用目的性状组合,达到有效提高选育效率的目的。
译 名：
Effects analysis of morphometric attributes on body weight for Egyptian strain of Oreochromis niloticus in different growth phases
作 者：
XIAO Wei;LI Da-yu;ZOU Zhi-ying;ZHU Jing-lin;YUE Yi-rong;HAN Jue;YANG Hong;Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization Ministry of Agriculture,Freshwater Fisheries Research Center,Chinese Academy of Fishery Sciences;
关键词：
Oreochromis niloticus;;correlation analysis;;path analysis;;morphological traits;;multiple regression equation
摘 要：
To study the effect of morphometric attributes on body weight of Egyptian strain of Oreochromis niloticus in different phases,119 fries were injected with RFID electronic tags to track and measure growth characteristics for comparative analysis. The attributes used in this study included total length,standard length,body depth,head length,caudal peduncle length,caudal peduncle depth,body width and body weight. Correlation coefficients matrices were constructed,in which the body weights were used as the dependent variable and other morphometric attributes as independent variables for correlation analysis and path analysis. The correlation coefficients,path coefficients and determination coefficients were calculated,and major morphometric attributes were determined. The results showed that all the correlation coefficients between each independent variable and dependent variable(body weight) were significantly different(P < 0. 01) in the total two different phases. In the first phase(2- 13 months),the trait with the path coefficients of significant difference(P < 0. 01) were total length(0. 417),body depth(0. 339) and body width(0. 212). The multiple regression equation rela-ting the body weight was established as y =- 307. 492 + 13. 667 X1+ 29. 638 X4+ 3. 545 X7,where y was body weight, X1,X4and X7were total length,body depth and body width respectively,and correlation index of equation was 0. 862. In the second phase(14- 25 months),the trait with the path coefficients of significant difference(P < 0. 01) were body depth(0. 550) and total length(0. 387). The multiple regression equation relating the body weight was established as y =- 68. 559 + 82. 443 X4+ 22. 717 X1,where y was body weight,X1and X4were total length and body depth respectively, and correlation index of equation was 0. 784. The results above indicated that morphological traits impacted body weight differently in Egyptian strain of Nile tilapia of different culture phases. We should pay more attention in selecting key morphological traits in complex traits selection to improve the accuracy of breeding projects.
