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Because of this variation, different numbers and varieties of fish and other aquatic wildlife can be found in each lake. Walleye, yellow perch, lake sturgeon, brook trout, lake whitefish, muskellunge, and introduced salmon species are among the many kinds of fish in the Great Lakes. Some fish are undergoing restoration efforts, such as lake sturgeon and lake trout.
Many people who fish in the Great Lakes region are aware of the sea lamprey that invaded the Great Lakes from the Atlantic Ocean in the 1930s and 1940s. It had a devastating effect on the Great Lakes fishery nearly bringing lake trout to extinction.