Friday June 12, 2026
Delta Stewardship Council —
California depends on the health of the Sacramento-San Joaquin Delta’s ecosystem. It supports native fish, provides recreation, and helps move water across the state. Yet, that ecosystem is being reshaped. The San Francisco Bay Delta is one of the most invaded estuaries in the world, with nearly 200 non-native species already here and new ones arriving. This includes the destructive golden mussel, which has been spreading rapidly since its detection in the Delta in 2024. They clog pipelines, damage other water infrastructure, and may compete with fish for food.
No single agency can solve the invasive species problem alone; success depends on coordination among state, federal, local partners, and communities. For example, the Golden Mussel Task Force includes agencies as well as academic and non-governmental partners working together to address this newest threat.
In recognition of California Invasive Species Action Week, June 6-14, we’re highlighting the Delta Interagency Invasive Species Coordination (DIISC) Team and its most recent Delta Invasive Species Symposium. The DIISC Team is co-led by the Delta Stewardship Council, the Sacramento-San Joaquin Delta Conservancy, the California Department of Fish and Wildlife, and the Department of Water Resources. California Invasive Species Action Week is an opportunity to learn about the impacts of invasive species on your local community, how to prevent their spread, and how to get involved in activities in your area.