Montana Fish, Wildlife & Parks may have found signs of exotic mussels in a routine plankton sample taken in July from the northern end of Flathead Lake near Woods Bay.

Eileen Ryce, FWP's aquatic invasive species coordinator, said microscopic larvae suspected to be from exotic mussels may be contained in four of 17 plankton samples collected from the 200-square-mile lake between May and August. Samples were sent to three out-of-state laboratories for testing last week.