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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.
Diporeia are keystone species in the Great Lakes. These are tiny, shrimp-like, invertebrate organisms that are normally found offshore in the bottom mud. They rely on settling algae from water as a food source. It seems that zebra mussels are competing and winning against Diporeia for their food source.