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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.
Hereâs a New Great Lakes Invasive Species to Worry About. The flying Asian carp have been making their way into the Great Lakes. But now a new fishâthe Eurasian ruffeâis threatening to invade the region. Getty ImagesThe ruffe is native to Central and Western Europe, but now it's poised to invade the Mississippi system.