There’s a new invasive species in town — meet the golden mussel. Golden mussels, originating from China and Southeast Asia, were first detected in California in October 2024 and are now spreading rapidly across the state. They can be identified in fresh to brackish water by their small size and light golden to darker yellowish-brown colored shell. Nicknamed ‘zebra mussels on steroids’ due to their rapid reproduction and broader environmental tolerance, golden mussels pose a serious threat to water quality, natural ecosystems, infrastructure and water conveyance systems. How you can help: Clean, Drain and Dry. CLEAN off visible aquatic plants, animals and mud from all equipment before leaving water access. DRAIN motor, bilge, livewell and other water containing devices before leaving water access. Clean boat and gear with hot water or DRY everything for at least five days. Slide 1: Golden mussel photos courtesy of Jeb Bjerke/CDFW Slide 2: Golden mussels found on a boat courtesy of ...