News & Features

Invasive Mussel Larvae Found in Montana Reservoir

Tiber Reservoir in north-central Montana tested positive for the larvae of aquatic mussels

GREAT FALLS – State officials say larvae from invasive aquatic mussels have been detected in Montana waters for the first time.

Tiber Reservoir in north-central Montana tested positive for the larvae of aquatic mussels. Tests from Canyon Ferry Reservoir near Helena show “suspect” but inconclusive results for mussel larvae.

Quagga and zebra mussels are not known to be established in Montana and can have negative impacts on fish, boats and water infrastructure.

Eileen Ryce with Montana Fish, Wildlife and Parks says there haven’t been any adult mussels found in the two reservoirs, indicating the infestation is new. She says the mussels are also unlikely to reproduce as water temperatures cool down for the winter.

FWP, along with other state and federal agencies, are working on containment efforts.

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