A tiny invasive species is a big threat to CA water

A tiny invasive species is a big threat to CA water

Golden mussels on a jar lid at Thermalito Forebay in Oroville on June 20, 2025. Photo by Miguel Gutierrez Jr., CalMatters When thimble-sized mussels were first detected last year in the Sacramento-San Joaquin Delta, biologists quickly rang the alarm over how severely this invasive species could threaten the state’s water supply systems.  Now, nine months after the mollusks’ appearance near Stockton, officials are in a race to rein in golden mus…