Tiny Invader Sparks Big Alarm in California Waterways

California is scrambling to contain an invasive species never before seen in North America: the golden mussel. First detected in October 2024 in the Sacramento-San Joaquin Delta, the tiny mollusk, no larger than a paperclip, has now triggered a sweeping, statewide emergency response.

State officials with the California Department of Fish and Wildlife unveiled a Golden Mussel Response Framework this week, calling the threat “urgent” and laying out a long-term strategy to prevent further spread. The mussels have already been spotted in multiple waterways, including the San Luis Reservoir, and their ability to form dense colonies could wreak havoc on infrastructure, agriculture, and ecosystems.

“The discovery of golden mussels in California is a serious challenge that requires coordinated action and a long-term commitment,” said Charlton Bonham, director of the CDFW, in a recent news release.

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“These impacts necessitate ongoing, costly removal to maintain operational function,” said CDFW spokesperson Krysten Kellum, SF Gate reported. The species, native to East and Southeast Asia, clogs pipes, damages watercraft motors, and threatens the drinking water supply for two-thirds of California residents.

In response, the California Department of Fish and Wildlife is offering $1 million in grants to support prevention efforts at boating facilities. New rules are also in place at several lakes and reservoirs, including mandatory 30-day quarantines and decontamination for trailered boats.

The response includes expanded boat inspections, public education campaigns, and enhanced decontamination infrastructure. Officials are urging boaters to follow the “Clean, Drain, Dry” protocol and report sightings of golden mussels immediately.

“Coordinated action will help safeguard critical water infrastructure,” said John Yarbrough, Deputy Director for the State Water Project. “We can’t afford to let this species spread unchecked.”

To report sightings or learn more about the state’s response, visit wildlife.ca.gov.

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