Genetic Identification of Sea Lamprey (Petromyzon marinus) Populations from the Lake Superior Basin

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Abstract
Sea lamprey (Petromyzon marinus) ammocoetes collected from 18 locations within Lake Superior were electrophoretically analyzed for genetic variability at 25 enzyme loci. Analysis by F statistics and χ2 tests indicated that a significant degree of population structuring occurs among lampreys from Lake Superior. Cluster analysis of genetic distances generally grouped collections that were in close geographical proximity to each other. A weak but significant correlation was detected between genetic and geographic distances. It was concluded that multiple populations of sea lamprey occur within Lake Superior. If this is the case, then sea lamprey control emphasis might shift from individual streams to population regions to minimize the rate of reestablishment subsequent to chemical treatment. It may also be wise to avoid the planting of fish species with migratory habits so as to prevent the passive transport of adult lampreys out of their population areas.Key words: lamprey, Petromyzon, genetics, population identification, Lake Superior, electrophoresis, management
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