The multivariate statistics analysis of the morphological difference between Carassius aurutus in Qihe River and the other three Carassius aurutus colonies

In order to inquire into the genetic state of the C.aurutus in Qihe River,three multivariate statistics analysis methods including cluster analysis,discriminant analysis and principal component analysis were applied to study comparatively on meristic morphological characters,measurable and truss frameworks morphological characters of the four colonies C.aurutus in Qihe River,Jindihe River,Beiyunhe River and Qinhe River which belonged to Yellow River system and the Haihe River system respectively.The results showed:(1) Compared with the other three C.aurutus colonies,C.aurutus in Qihe River had significantly morphological specificity.The means of the scales above the lateral line,scales below the lateral line and the anal fin numbers of the C.aurutus in Qihe River were all significantly higher than that of the other three colonies C.aurutus,and its means of the scales of lateral line were lower than that of the C.aurutus in Jindihe River.The C.aurutus in Qihe River had significant advantages on its body width,length of dorsal fin,length of trunk,length and height of cauda,meanwhile it had significant disadvantages on the length of anal fin,the size of the head and the body depth.(2) There was close relationship between C.aurutus in Qihe River and the C.aurutus in the Beiyunhe River,C.aurutus in Jindihe River had close relationship with C.aurutus in Qinhe River.Compared with the C.aurutus in Qinhe River,the C.aurutus in Qihe River had a closer relationship with the C.aurutus in Jindihe River.The C.aurutus in Qihe River still preserved special genetic character,which had not significant influence from the exotic genetic.