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¹ Dalian Ocean University, College of Fisheries and Life Science, Dalian 116023, China
² Florida International University, Department of Biological Sciences, North Miami, 33181, USA DOI : 10.4194/1303-2712-v20_7_05 Viewed : 2506 - Downloaded : 1625 To investigate genetic diversity of the far eastern catfish (Silurus asotus) populations in the Yellow River, the Songhua River, and the Dayanghe River, mitochondrial control region (D-loop) DNA was analyzed for the samples collected in Zhengzhou (ZZ in the Yellow River), Haerbin (HEB in the Songhua River), and Donggang (DG in the Dayanghe River). There were totally twenty-one haplotypes identified in the three groups of samples. Haplotype networks by using neighbor-joining and median-joining clustering methods both indicated that the haplotypes 3, 8, and 19 constituted a single branch and the other 18 haplotypes constituted another branch. The highest genetic differentiation coefficients were observed between the ZZ and HEB samples (0.264), and the lowest was between the ZZ and DG (0.101). The average gene flow among the three populations was 3.063. The Fu's Fs and Tajima's D test values of the three populations were both negative, and indicated no significant difference between three populations (p=0.08 and 0.06> 0.05). Our results suggest that the far eastern catfish populations have not undergone significant population expansion and remained stable in the Yellow River, the Songhua River, and the Dayanghe River. Keywords : Silurus asotus, D-loop, Genetic diversity, Genetic structure, Population expansion