Water Samples Positive for Invasive Mussel Larvae in Tiber Reservoir

HELENA - Water samples from Tiber Reservoir east of Shelby have tested positive for the larvae of aquatic invasive mussels, with similar tests from Canyon Ferry Reservoir near Helena showing “suspect” or inconclusive results, according to officials at Montana Fish, Wildlife & Parks (FWP).

FWP, along with other state and federal agencies and the Montana Invasive Species Advisory Council (MISAC), are now working to determine whether adult mussels are present in Tiber Reservoir and to get further test results on Canyon Ferry.

“This is the first positive test in Montana for the larvae of quagga or...