- LAKE COUNTY NEWS REPORTS
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Newly detected invasive golden mussels pose potential threat to Clear Lake, Lake County waterways and infrastructure
LAKE COUNTY, Calif. — A newly detected invasive mussel is posing a potential threat to Lake County’s water bodies.
The Lake County Water Resources Department, and Watershed Protection District urge residents and visitors to Clear Lake, and other Lake County water bodies, to be aware and on the lookout for invasive golden mussels (Limnoperna fortunei).
The newly detected invasive mussel (freshwater bivalve) found in several locations in the Port of Stockton and in the Sacramento-San Joaquin Delta region.
On Oct. 17, the California Department of Water Resources reported finding attached, adult mussels at a sample site location in the Port of Stockton.
Mussel specimens were sent to UC Davis Genomic Variation Laboratory and confirmed to be golden mussels, originally from China and Southeast Asia; the species had not previously been detected in North America.
Water Resource managers are concerned. While similar in appearance, biology and potential ecosystem effects to quagga and zebra mussels (the current focus of invasive mussel prevention programs in Lake County), golden mussels pose an even greater threat.
“Golden mussels have been found in soft surfaces [e.g., fine silt and sediments] and attached to hard surfaces. Adult mussels are mobile and have been observed to move freely within a waterbody,” notes California Department of Fish and Wildlife Regional Biologist, Angie Montalvo, who observes Clear Lake on behalf of the State agency. “[Golden Mussels] have a much wider tolerance threshold than Quagga-Zebra mussels. This discovery is serious.”
Much like quagga and zebra mussels, golden mussels, if established in Clear Lake or other Lake County water bodies, pose a significant threat to water conveyance systems, infrastructure, and water quality.
Effects golden mussels would have on sport fisheries, like bass, crappie, and catfish, native fisheries and wildlife species, like the Clear Lake Hitch and Clark’s and Western Grebes (which feed and forage in shallow lake areas on green algae), and plants whose populations can become heavily disrupted when invasive mussels establish, are not fully known.
Golden mussels were likely introduced to California by a ship traveling from an international port. Lake County water managers are concerned they may mobilize further from the Delta (likewise a popular California sport fishery) to Lake County overland on a visiting boat.
Therefore, the Lake County Water Resources Department is reminding the public, both residents and visiting boaters, to get their boat screened by trained and certified boat screeners and inspectors (the Lake County Invasive Mussel Prevention Program) whenever coming back to the county from Delta region or waters.
In addition to routine screenings, some boats may be inspected or required to undergo decontamination beyond what has been typical in Lake County. Please be patient and understanding with staff and certified screeners and vendors.
County water officials ask that boaters always remember to “clean, drain, dry” whenever moving a boat between water bodies — every time.
Visit www.nomussels.com for more information on the Lake County Mussel Prevention Program. To learn more about Lake County’s efforts to plan for an invasive mussel rapid response, visit https://www.clearlakemusselprevention.org/.
The California Department of Fish and Wildlife are also encouraging boaters and water users to visit their new website, “California’s Invaders: Golden Mussel,” to learn more about this dangerous newly detected invasive species: https://wildlife.ca.gov/Conservation/Invasives/Species/Golden-Mussel.
If you think you visually observe a golden, quagga or zebra mussel, please contact the Water Resources Department at 707-263-2344 or email at This email address is being protected from spambots. You need JavaScript enabled to view it..