Morphological variations and discrimination between northern pike Esox lucius and Amur pike Esox reicherti
HUO Tang-bin1,2,YUAN Mei-yun3,MA Bo1,CAI Lin-gang4,Adakbek·kar4,JIANG Zuo-fa1
1.Heilongjiang River Fisheries Research Institute,Chinese Academy of Fishery Sciences,Key Field Scientific Observation Station of Fisheries Resoures and Environment in HeilongJiang River Valley,Ministry of Agriculture,Harbin 150070,China;2.Northeast Forestry University,Harbin 150040,China; 3.Institute of Fisheries Research,Harbin Academy of Agricultural Sciences,Harbin 150078,China;4.Institute of Fisheries Science,Xinjiang Uygur Autonomous Region,Urumqi 830000,China
Abstract: A total of 36 morphometric and twelve meristic features were measured in 115 specimens of both northern pike Esox lucius and Amur pike Esox reicherti to evaluate the morphological variations and discrimination by combination of traditional morphological data with truss network data using cluster analysis,and principal component analysis.The meristic features indicated that there were significant differences between E.lucius and E.reichrti in number of spine on dorsal fin,number of spine on anal fin,number of soft anal ray,scale number on lateral line, scale number above lateral line and scale number beneath lateral line.The cluster analysis revealed that the morphometric characters were coincident with the principal component analysis.The northern pike was clearly found to be separated from three populations of Amur pike.There was the minimal difference in Amur pike between Wusulijiang river population and Nengjiang river population.Discriminant analysis showed that very significant differences were found among the different populations(P＜0.01),with identification accuracy P1of 96.4%-100%in the four populations,indicating that there were some differences between northern pike and Amur pike.
2011, Vol. 26 
