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Friday, November 6th, 2026

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Invasive sea lamprey numbers increasing in Lake Superior

Sea lampreys invaded the Great Lakes in the 1920s and ’30s via the St. Lawrence Seaway, and they’ve been killing gamefish ever since. (Photo courtesy of USFWS)

If anglers are heading to Lake Superior or nearby streams and rivers, they might pull out a fish sporting a circular wound, or there even might be a parasite fish connected to the larger sportfish.
The small fish that resemble mini-eels are called sea lamprey, and they cause the circular wounds on larger gamefish. Sea lampreys invaded the Great Lakes in the 1920s and ’30s via the St. Lawrence Seaway, and they’ve been killing gamefish ever since.

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