Quagga/Zebra Mussel News

This message is being forwarded on behalf of California State Parks, Division of Boating and Waterways:

Save-The-Date Grant Announcement

California State Parks Division of Boating and Waterways (DBW)

QZ Grant Program has the following announcement:

The application period for the 2025 cycle will open on March 10, 2025 and will close on April 18, 2025 at 5:00 p.m. Up to $2M is expected to be awarded, pending available funding. If a reservoir is currently covered by a two-year 2024 QZ Grant, that reservoir will not be considered for a QZ Grant until the 2026 solicitation.

A presentation will be conducted via MS Teams on March 13, 2025; information will be posted on our webpage at: QZGrant@parks.ca.gov. The 2025 QZ grants are expected to begin in August, and will span two years.

Minimum Eligibility Requirements:

Grant applicant must own/manage any aspect of the water in a reservoir; The reservoir must be open to the public for recreation; and Grant applicant must demonstrate that the reservoir is uninfested with dreissenid mussels

To demonstrate that the reservoir is uninfested, applicants must provide mussel monitoring data collected since March 2024. Monitoring data can be from surface surveys, artificial substrates, and plankton tows.

Tier 2 Implementation Grant:

To be eligible for an implementation grant, applicants must provide a letter from the California Department of Fish and Wildlife (CDFW) at the time of application that states CDFW has reviewed and accepted a prevention plan for the reservoir (per Fish and Game Code Section 2302 and California Code of Regulations, Title 14, Section 672.1(b)).

Tier 1 Planning and Assessment Grant:

Applicants that do not already have a CDFW-accepted prevention plan can apply for a planning and assessment grant in order to develop a CDFW-accepted prevention plan for the reservoir.

For questions regarding quagga/zebra mussel monitoring, or for prevention planning, including how to obtain a letter from CDFW, contact CDFW at Invasives@wildlife.ca.gov or Telephone: (866) 440-9530.

Additional information will be sent prior to opening of the grant application window. This notice will also be posted on the DBW website.

The 2025 Invasive Mussel Water Agency Summit is intended for water managers in California.

California Department of Fish and Wildlife (CDFW) will host a virtual Invasive Mussel Water Agency Summit (Summit) on January 28, 2025, from 9:00 a.m. to 12:15 p.m.. The Summit will be hosted online from the Zoom platform and is intended for waterbody managers statewide. Following a 45-minute lunch break, CDFW will hold open “office hours” from 1:00 PM to 2:30 PM for more interactive dialogue with water managers.

The purpose of the Summit is to provide an update on the recently discovered golden mussel and to review quagga/zebra mussel prevention and control measures. The information will be relevant to water managers already implementing mussel prevention programs, as well as those interested in developing programs. This is also a networking opportunity to connect with your local CDFW contact, and other water managers in your vicinity, and across the state.

• Agenda (PDF)
• Register for the Webinar

The registration link and agenda will also be posted on the 2025 Invasive Mussel Water Agency Mussel Summit page. For questions regarding the 2025 Invasive Mussel Water Agency Summit, please email Invasives@wildlife.ca.gov.

The following information is being forwarded on behalf of Invasive Species Council of California (ISCC):

Annual Meeting - December 17, 2024

The Invasive Species Council of California (ISCC) meeting agenda for Tuesday, December 17, 2024 is available for download at the ISCC website, located here:

- Agenda

The meeting will be held in-person at the California Department of Food and Agriculture auditorium and remotely via webinar.

Golden mussel (Limnoperna fortunei), an invasive, non-native freshwater bivalve, was recently discovered in the Port of Stockton by California Department of Water Resources staff while conducting routine operations. Suspected golden mussels have also been identified at O’Neill Forebay in Merced County and are currently undergoing genetic testing for confirmation.

This discovery is the first known occurrence of golden mussels in North America. The species poses a significant immediate threat to the ecological health of the Delta and all waters of the state, water conveyance systems, infrastructure and water quality.

In waterways where this species is present, heavy encrustations of golden mussels have blocked municipal and industrial water intakes, necessitated ongoing biofouling removal, harmed native species in the ecosystem, increased water clarity due to intense filter feeding, and diminished water quality.

The California Department of Fish and Wildlife (CDFW), California State Parks, California Department of Water Resources (DWR), U.S. Fish and Wildlife Service, Bureau of Reclamation, and other state, federal, and local agencies regularly coordinate through the Aquatic Invasive Species program. This partnership aims to limit the spread of invasive species in California’s waterways, which cause damage to native species and the ecosystems they need to survive.

Golden mussels were likely introduced to California by a ship traveling from an international port. They are likely to spread throughout the Delta and through the water conveyance systems associated with it. Without containment, golden mussels are likely to spread to other freshwater bodies in California, and to other ports and inland waters of North America, and abroad.

Following the initial discovery of golden mussels in the Port of Stockton, observations of additional mussels have been made on monitoring equipment downstream. Species confirmation is pending for these organisms. Golden mussels are similar in appearance, biology, and impacts to quagga and zebra mussels and are a continued priority for prevention and containment in inland waters of Southern California and across the state.

Golden mussels are native to rivers and creeks of China and Southeast Asia. They are known to be established outside of their native range in Hong Kong, Japan, Taiwan, Brazil, Uruguay, Paraguay and Argentina. The initial introductions to these countries were also likely the result of ships from biofouling on the hulls and/or ballast water release. In most cases, the invaded range has expanded upstream from the point of introduction and inland from ports through local, human-mediated pathways. Within the invaded range significant impacts are widely documented resulting from the dense colonization of golden mussels on hard surfaces. The California Natural Resources Agency and its partners call upon everyone working and recreating in waters of the state to clean, drain and dry watercraft and equipment every time it is removed from a waterbody. This simple measure has served to prevent spreading quagga and zebra mussels and is equally effective in stopping the overland spread of golden mussels. DWR is now conducting boat inspections at O’Neill Forebay in an effort to reduce the spread of aquatic invasive species.

CDFW is continuing to work with state, local, and federal agencies to enhance monitoring efforts, communicate additional detection and response information, and coordinate on potential next steps. Please report organisms observed in California suspected to be golden mussels to CDFW’s Invasive Species Program. Include the specific location of the observation, and at least one clear close-up photograph of the organism, and your contact information. Submit reports via one of the following options:

Online at wildlife.ca.gov/Conservation/Invasives/Report
Via email to invasives@wildlife.ca.gov
Via telephone to (866) 440-9530

To prevent the spread of invasive mussels, be sure to clean, drain and dry your boats. For more information on golden mussels refer to CDFW's webpage: California’s Invaders: Golden Mussel. Learn more at California State Parks’ Division of Boating and Waterways webpage: dbw.parks.ca.gov/StopQZ.

On April 9, California Department of Wildlife (CDFW) Invasive Species Program staff detected 12 veligers using cross-polarized microscopy in a plankton tow sample collected on February 23 at Castaic Lagoon, which is downstream of Castaic Lake. On April 10, CDFW staff also detected 33 veligers in a plankton tow sample collected on March 30 in Castaic Lagoon. The veligers in Castaic Lagoon have been confirmed to be quagga mussel via PCR and DNA sequencing.  

Castaic Lagoon is located near the unincorporated community of Castaic in Los Angeles County. It is immediately downstream of Castaic Lake and used for non-powered boating, canoeing, and swimming. Castaic Lake and Castaic Lagoon are part of the State Water Project and of the Castaic Lake State Recreation Area. The California Department of Water Resources (DWR) is the water manager for Castaic Lagoon and the Los Angeles Department of Parks and Recreation manages recreational access.

Adult quagga mussels were discovered in Castaic Lake in 2021. Pyramid Lake, known to have quagga mussels since 2016, is upstream of Castaic Lake. Castaic Lagoon is immediately downstream of Castaic Lake and has been presumed to be exposed to mussels.

Castaic Lagoon discharges to Castaic Creek, a tributary to the Santa Clara River. Quagga mussels were discovered in the Santa Clara River downstream of Castaic Creek below the confluence with Piru Creek in 2017.

For questions that are specific to DWR’s response, please contact Maggie Macias, DWR Information Officer at (916) 902-7405. For questions regarding CDFW’s response, please contact CDFW’s hotline at (866) 440-9530.