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David Baisch ACF Abstract FY13

"Origin of Great Lakes Brown Trout, Salmo trutta: A Phylogeographic Analysis Using mtDNA Sequence Variation"

142nd Annual Meeting of the American Fisheries Society

The brown trout, Salmo trutta, was first introduced to the Laurentian Great Lakes in 1887 from European broodstocks to found a recreational salmonid fishery; however, the origins of these progenitor lineages remain largely unknown. The objective of this study was to determine the European lineages of brown trout found in the Great Lakes. We analyzed 125 brown trout from ten watersheds across Michigan and Wisconsin and identified their strain assignment using eight mtDNA ND-1 sequences. European progenitor lineages occurring within these strain assignments were then identified using the first 309 base pairs of the mtDNA control region. We identified seven ND-1 haplotypes in the 71 trout sampled and a total of three different European lineages were identified by 4 SNPs in the mtDNA control region. Fisheries managers can use this information to make informed stocking decisions by stocking strains whose associated lineages are better adapted to Michigan streams.