(IL) Chicago Sun Times - Twenty years after the pervasive zebra mussel was first detected in the Great Lakes, the U.S. Coast Guard is preparing rules to prevent new invasive species from infiltrating the nation’s freshwater systems.

Ecologists, environmentalists and public officials have mixed feelings about the rules. While they are delighted over the prospect of the first national standard for treating ship ballast water, they’re disappointed by the timetable.

“We’ve been dealing with this issue literally for decades,” said Matt Frank, secretary of the Wisconsin Department of Natural Resources. “And we don’t believe the Coast Guard rules are aggressive enough.” More