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Divers search for adult invasive mussels in Tiber

Thursday, September 20, 2018/Categories: AIS News/Tags:

Divers searched for adult aquatic invasive mussels at Tiber Reservoir last week but found none.

The five divers involved in the effort were from the U.S. Fish and Wildlife Service and coordinated by Montana Fish, Wildlife & Parks. The primary search area was Tiber Dam up to a depth of about 35 feet.

With its rock structure, the dam is good habitat for the invasive mussels, which prefer attaching to solid substances, such as rocks. However, deeper than 35 feet, silt reduces the habitat for mussels significantly.

The divers are part of FWP’s monitoring plan for Tiber Reservoir after water samples in 2016 came back positive for aquatic invasive mussel larvae. The monitoring plan also increased the frequency of water sampling at the reservoir.

To view a copy of FWP’s AIS monitoring plan or for more information about Montana’s efforts to defend against aquatic invasive species, visit


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AIS Bureau, Montana FWP
1420 East Sixth Avenue
Helena, MT 59620
Phone: (406) 444-2440

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