Lake Superior other Great Lakes fish, populations have also been affected by the accidental or intentional introduction of foreign species such as the sea lamprey and Eurasian ruffe. Accidental introductions have occurred in part by the removal of natural barriers to navigation between the Great Lakes. Overfishing has also been a factor in the decline of fish populations. Lake Superior Lake Superior (; ), the largest of the Great Lakes of North America, is also the world's largest freshwater lake by surface area, and the third largest freshwater lake by volume. The lake is shared by the Canadian province of Ontario to
Flathead Lake pressure on the ecologically similar threatened bull trout. Since the inception of this event in 2002, over 402,000 lake trout have been harvested. In addition to these commonly-pursued game fish, the lake is also home to other native species that currently aren't actively managed by government fish and wildlife agencies, including the Longnose Sucker, Redside Shiner, and Slimy Sculpin. Flathead Lake Flathead Lake (Salish: člq̓etkʷ ) is a large natural lake in northwest Montana, and is the largest natural freshwater lake by surface area that is west of the source of the Mississippi River in the contiguous United States. The