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Lawmakers propose ship inspections to stop exotic species
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Zebra mussels are just one of many invasive species that have entered the Great Lakes through ballast water dumped by oceangoing ships. Two state lawmakers propose such ships should be inspected before entering Minnesota waters. (Photo by Simon van Mechelen, University of Amsterdam, 1990)

Zebra mussels are just one of many invasive species that have entered the Great Lakes through ballast water dumped by oceangoing ships. Two state lawmakers propose such ships should be inspected before entering Minnesota waters.

(Photo by Simon van Mechelen, University of Amsterdam, 1990)
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