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| Analysis and Discrimination of Sexual Dimorphism of Hemibarbus maculatus Bleeker by Morphometry |
| TUO Yun,XIAO Tiaoyi |
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Abstract Hemibarbus maculates Bleeker ,a small freshwater fish in family Cyprinidae ,as an endemic species in China ,is of great commercial value .In this paper ,we studied morphological information of 132 H .maculates samples collected at Yuanzhou section (113°54′-114°37′E ,27°33′-28°05′N )of Yuanhe River in Yichun , Jiangxi Province from March in to 2009 June in 2012 .Based on the analysis of the morphological index system by Principal Components and R-cluster Analysis ,H .maculates was classified by body size and condition factor .On the basis of this analysis ,19 characteristics were normalized and further used for stepwise discriminant ,and then 5 characteristics were screened including condition factor , interorbital ,body depth ,distance between pelvic fin and anal fin ,and caudal peduncle length .Thus the discriminant equations were built for classification of 132 samples with accuracy rate of 97% .One‐way ANOVA revealed that there were significant differences in seven standardized characteristics and body length between male and female populations (P<0 .05) .Therefore ,it was concluded that the female H . maculates collected from Yuanhe River were superior to males in the condifion factor and body size ,but had smaller interorbital diameter ,caudal peduncle length and pectoral fin length .The findings can be used in sexual identification of H .maculatus and provides the basis information for its reproduction .
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Received: 25 October 2015
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