The Golden Mussel (Limnoperna fortunei), an invasive species first detected in California in 2024, has been confirmed within Westlands Water District. This poses a serious threat to on-farm water systems and irrigation infrastructure.
The District is collaborating with the California Department of Fish and Wildlife and other water agencies to gather information and explore strategies. Currently there are no known preventative measures.
Golden mussels:
- Clog pumps, pipes, and irrigation lines, reducing water flow and increasing maintenance costs.
- Reproduce rapidly—a single mussel can release up to 1 million larvae annually, which can travel through canals and pipelines.
- Attach to hard surfaces such as screens, valves, and siphons, forming dense colonies that are extremely difficult to remove.
- Impact water quality, potentially altering ecosystems and increasing treatment needs.
Identification:
- Size: ¾ to ~2 inches
- Color: Light golden to yellowish-brown
- Found attached to irrigation equipment, canal walls, or submerged surfaces in fresh or slightly brackish water.
What You Should Do:
If you see mussels in your filters, irrigation system or other equipment:
- Take clear, close-up photos with an object for scale (e.g., coin or pencil).
- Report immediately to the California Department of Fish and Wildlife (CDFW):
- Online: Fish and Wildlife
- Email: invasives@wildlife.ca.gov
- Phone: (866) 440-9530
No. 786