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Fish, Birds and AnimalsFoodInvasive SpeciesLatest NewsNewsRecreation and TourismRecreational Hunting and FishingResearch, Data and TechnologyScience, Technology, ResearchMercury Levels Maintained: Invasive mussels keep mercury levels high in Great Lakes fish
-The spread of invasive zebra and quagga mussels in the Great Lakes started a chain of events resulting in high mercury levels in lake trout.
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