The North Coast Watershed Association is holding a seminar on freshwater mussels at 7 p.m. Thursday at the Astoria Science Center, behind Astoria High School, 785 Alameda Ave.

The United States is home to nearly 300 species of freshwater mussels, but nearly 70 percent of the species in the Pacific Northwest are either endangered or extinct.

At the seminar Thursday, Astoria High School fisheries and technology teacher Lee Cain will present the results of a freshwater mussel survey in Clatsop County.

Also, Al Smith of the Pacific Northwest Native Freshwater Mussel Workgroup will present information on the status of mussels in the region, and Val Brenneis, a graduate student studying ecology at the University of California-Davis, will talk about the impact of invasive New Zealand mudsnails in the Columbia River estuary.

For more information, contact Lori Lilly at 325-0435.

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