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abundance analysis anglers aquatic ecosystem Arm of Rainy assess basins beaver biological black crappie blue-green algae catch Centrarchidae changes collected contamination creel surveys Cyprinidae densities Department of Natural deposition depths diatoms dominant drainage ecological effects Eibler Environmental Figure fish community fish species gill habitat Hargis harvest Hg concentrations hydrologic identified interior lakes International Falls Journal of Fisheries Kabetogama Lake Kallemeyn Kepner and Stottlemyer Lake Agassiz lakes in Voyageurs largemouth bass littoral Locator Minnesota Department MNDNR Mukooda lakes Namakan Lake Namakan Reservoir Natural Resources northern pike occur OMNR Ontario Park lakes Payne phytoplankton populations potential yield rainbow smelt Rainy and Namakan Rainy Lake Rainy Lake watershed Report rule curves sampling Sand Point lakes sediments smallmouth bass Sorensen South Arm spawning studies summer tion trophic U.S. Geological Survey unpublished data USGS VOYA VOYA/USGS Voyageurs National Park walleye water levels water quality wetlands yellow perch zooplankton