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| Mathematical Analysis of Effects of Morphometric Attributes on Body Weight and Growth of Hemibarbus labeo in Cage Culture |
| LI Jun,LUO Xiao-nian,JIN Guang-hai,LIU Yi-xin,LI Jing-wei,YANG Pei-min |
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Abstract Eleven morphometric attributes including total length (x1 ) ,body length(x2 ) ,body depth (x3 ) , head length (x4 ) ,snout length (x5 ) ,interorbital (x6 ) ,postorbital head length (x7 ) ,caudal peduncle length (x8 ) ,caudal peduncle depth (x9 ) ,head depth(x10 ) and body weight(y) were measured in 234 three‐month‐old H emibarbus labeo samples . T he correlation index , path coefficients and determination coefficient were calculated based on morphometric attributes by correlation analysis ,path analysis and multivariate analysis ,and the significan morphometric attributes (P<0 .05) were used to establish the multiple regression equations .The results showed that the maximal coefficient of variation was found in y (21 .5806% ) , higher than that in variation of the other morphological attributes , with a normal distribution in morphometric attributes . T he correlation coefficients of morphological attributes to body weight were all at very significant level (P< 0 .01) .The path analysis revealed that partial regression coefficients of x2 (0 .4316) , x3 (0 .3487) , x6 (-0 .0621) , x9 (0 .2071) and x10 (0 .1101) were found at significant level (P< 0 .05) .The determination coefficients was larger in x2 (0 .1863) than that in x3 (0 .1216) ,x9 (0 .0429) ,x10 (0 .0121) and x6 (0 .0039) .The determination coefficient of x2 and x3 to y was higher than that of others .The high value of correlation index between morphometric attributes and body weight was 0 .892 (r2 ) with significant level (P<0 .05) ,indicating that the five attributes (x2 ,x3 ,x6 ,x9 and x10 ) were key morphometric attributes to the body weight and practical in the selective breeding of H . labeo .The significant morphometric attributes (P<0 .05) were used to establish the multiple regression equation as y = -3 .778+0 .550x2 +1 .417x3 -0 .839x6 +1 .915x9 +0 .715x10 ,in juvenile H .labeo[x2 =(5 .30 ± 0 .34) cm ,x3 = (1 .15 ± 0 .11) cm ,x6 = (0 .51 ± 0 .03) cm ,x9 = (0 .49 ± 0 .05) cm ,and x10 =(0 .99 ± 0 .07) cm ,Y = (1 .98 ± 0 .43) g] .The fish cultured in the cage for 26 months had x2 = (32 .40 ± 2 .87 ) cm ,x3 = (7 .22 ± 0 .84 ) cm , x6 (1 .18 ± 0 .09 )cm , x9 (2 .78 ± 0 .32 ) cm , x10 (5 .33 ± 0 .64 ) cm and y= (576 .94 ± 143 .82 ) g .
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Received: 25 June 2014
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