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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.
Examples of such introduced aquatic species in the Great Lakes include carp, zebra mussels, sea lamprey, goby and ruffe. Perhaps one of the most notable accidental introductions was that of the sea lamprey (Petromyzon marinus) to the majority of the Great Lakes, between 1936 and 1946.