Genetic Population Structure and Mixed-Stock Analysis of Walleyes in the Lake Erie–Lake Huron Corridor using Allozyme and Mitochondrial DNA Markers

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Abstract
We used allozymes and mitochondrial DNA (mtDNA) restriction fragment length polymorphisms to determine if spawning populations of walleyes Stizostedion vitreum from the Lake Erie–Lake Huron corridor are genetically differentiated and to estimate their contributions to a commercial fishery in southern Lake Huron (operated by Purdy Fisheries) in 1994 and 1995. Both types of genetic markers detected significant differentiation among walleyes collected from different sites, suggesting that fish from Lake Erie, Lake St. Clair, and Lake Huron are not a single, genetically homogeneous population. The combined use of both marker systems detected the greatest differentiation in pairwise comparisons of samples. Although some exceptions were detected, both marker types suggest a relationship between geographic proximity and genetic differentiation. The fish from Purdy Fisheries caught throughout 1994 had highly significantly different haplotype frequencies (mtDNA) but not allele frequencies (allozymes) from...

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