FWP ups state defenses against aquatic invasive species

In spite of the occasional discovery at a check station, zebra mussels haven’t moved into Montana yet. “The five northwestern states are free of mussels and that’s currently the line,” Begley said. The same can’t be said for Eurasian watermilfoil, which first invaded Montana in 2006. After lurking in Idaho’s Lake Pend Oreille, where it’s been degrading the water quality for a decade, it finally showed up in the Clark Fork River.
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