What invasive species is an external parasite of lake trout and decimated populations for more than 20 years?

Name: What invasive species is an external parasite of lake trout and decimated populations for more than 20 years?
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The lamprey is an external parasite of lake trout and has significantly impacted their populations by attaching to the fish and feeding on their body fluids, leading to the decimation of lake trout populations for over two decades.

What Invasive Species Is an External Parasite of Lake Trout