Quagga Mussels

A scubadiver holds a rock covered in quagga mussels on Lake Michigan in 2017.
Nicky Ouellet / Yellowstone Public Radio

Montana’s U.S. Senators on Wednesday introduced a bill aimed at stopping the spread of aquatic invasive species like zebra and quagga mussels. They have the potential to devastate hydro-electric systems and public water pipes and take over lakes.

State and tribal officials announced Thursday that a boat carrying invasive zebra mussels slipped through two Montana inspection stations, but inspectors in Ravalli found the mussels and decontaminated the vessel.

Tiny New Zealand mud snails surround a dime for scale.
Montana Fish, Wildlife and Parks


The first discovery of an invasive snail west of the Continental Divide in Montana is pushing wildlife officials to quarantine a fish hatchery south of Hamilton.

Flathead Lake continues to defy national trends as a healthy blue body of water that’s free of invasive mussels. That’s according to the director of the University of Montana’s Flathead Lake Biological Station, who gave his annual state of the lake address Friday. 

Western governors want to see more federal action to combat tiny but destructive creatures: invasive mussels.

A quagga mussel is only about the size of your thumbnail. But when the little mollusk reproduces en masse, it can wreak havoc on agriculture and lake tourism.