Science & EnvironmentOregon mussels died at alarming rates this summer. Researchers don’t know whyBy April Ehrlich (OPB)DEPOE BAY, Ore. Sept. 16, 2023 12 p.m.A naturally occurring toxin could be to blame📨 Daily news in your inboxSign up today for OPB’s “First Look” – your daily guide to the most important news and culture stories from around the Northwest.EmailPlease leave this field blankSign up