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Foreign ships like this one from Cypress are known as "Salties" around the Great Lakes. These ships are responsible for bringing aquatic invasive species into the Lakes, and we're all paying a price. (Photo by Mark Brush)

In looking at these threats to the Great Lakes, almost everyone we surveyed agreed the worst threat was alien invasive species. Shipping goods in and out of the Great Lakes has helped build the major cities on the Lakes. But shipping from foreign ports has brought in unwanted pests. Zebra mussels are probably the most infamous, but there are more than 160 aquatic species that have invaded the Lakes and changed them, almost always for the worse. So why can't we keep them out?

The Council of Great Lakes Industries

Northeast Midwest Institute on biological pollution

Alliance for the Great Lakes

Producer: Lester Graham
Release Date: October 10, 2005
Running Time: 4:27

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