A survey of rivers, lakes and streams within 5 miles of Capitol Lake is under way to determine whether the New Zealand mud snail exists elsewhere in Thurston County.
Capitol Lake is infested with the invasive species and has been closed to public use indefinitely in an attempt to keep the snail from spreading.
The snail, about the size of a grain of rice when fully grown, has no natural predators in the United States. It can be easily transported on the bottom of a boat, on clothing or on a pet’s foot pad.
Results from the survey sponsored by the state’s Invasive Species Council are expected within a month.