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Overview
Basics
Basics
On September 6, 2023, invasive New Zealand mudsnails (NZMS) were discovered in areas off the South Shore by divers conducting aquatic invasive plant monitoring. Following rapid response protocols under the federally approved Lake Tahoe Aquatic Invasive Species Management Plan, TRPA convened an incident team comprised of staff from TRPA and Tahoe RCD and partner experts. A technical advisory committee was formed to provide expertise to the incident team.
The rapid response includes delineating infestation, tracking spread, implementing prevention procedures to prevent further spread, incorporating education components for the public and partners, and researching management options.
Implementation
2023
2023
2024
$550,000
Emily Frey (efrey@trpa.gov)
01/12/2024
03/19/2024
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| Location Information | Location Notes |
|---|---|
Organizations
Organizations
EIP Details
EIP Basics
EIP Basics
Performance Measures
Expected Performance Measures
Expected Performance Measures
| Watercraft Inspections for Invasive Species | [Action Taken: Watercraft Decontaminated], [Invasive Species Detected: Other (fauna)] | number | |
| New Invasive Species Locations Detected | [Invasive Species Type: Aquatic] | number | |
| Acres of Invasive Species Inventoried | [Invasive Species Type: Aquatic] | acres |
Reported Performance Measures
Reported Performance Measures
| Acres of Invasive Species Inventoried | |||
|---|---|---|---|
| 2023 | Total | Units | |
| Invasive Species Type | |||
| Aquatic | 3,200 | 3,200 | acres |
| Total | 3,200 | 3,200 | acres |
Funding
Expected Funding
Expected Funding
$550,000
$250,000
$300,000
| Total | |||
|---|---|---|---|
| Lake Tahoe Restoration Act (TRPA) | $150,000 | $150,000 | $0 |
| U.S. Fish and Wildlife Service (USFWS) | $100,000 | $100,000 | $0 |
| Grand Total | $250,000 | $250,000 | $0 |
Reported Expenditures
Reported Expenditures
| Total | 2023 | |
|---|---|---|
| Lake Tahoe Restoration Act | $150,000 | $150,000 |
| Grand Total | $150,000 | $150,000 |
Photos
Invasive New Zealand mudsnails on algae in Lake Tahoe.
(Timing: During) (~1,363 KB)
Invasive New Zealand mudsnails from Lake Tahoe under a microscope.
(Timing: During) (~534 KB)
New Zealand mudsnail size is about the size of a grain of rice.
(Timing: During) (~658 KB)
Size of invasive New Zealand mudsnail compared to a dime.
(Timing: Unknown) (~62 KB)
Other Details
Watersheds
No watersheds set for this project.
Threshold Categories
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Maintain healthy habitats and ecosystems for native fish.
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Maintain healthy nutrient and algal levels in the Lake and tributaries.
Local and Regional Plans
No Local and Regional Plans set for this project.
Related Projects
Related Projects
No Related Projects set for this project.
External Links
Notes
Notes
| 03/15/2024 8:35 AM | Emily Frey | Note that the Acres of AIS Inventoried metric only includes the 3200 acres of the Grid Survey which spanned from Eagle Point to Nevada Beach (approx. 10 miles). Metric does not include the following monitoring actions for which we do not currently have a way to calculate acreage: - Rapid Assessment line survey - Lakewide transects: 109 transects of varying lengths - Tahoe Keys Rake Point Sampling: 31 composite samples - eDNA: 36 samples |
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| 01/12/2024 12:37 PM | Emily Frey | The incident team and the Watercraft Inspection Program took quick action to modify the inspection and decontamination protocols to address the discovery. In addition, the team began planning for the 2024 boating season. Outreach actions included alerting partners and planning to bolster the non-motorized users and anglers, including social media, trainings and signage. In 2023, the incident team worked to delineate the extent of NZMS infestation by various methods described below: - Rapid assessment line surveys near the area where NZMS were first identified - A point grid survey spanning from Eagle Point to Nevada Beach, including three deep water (150 feet) transects - The Lakewide Transect AIS Monitoring methodology was adapted to capture NZMS absence or presence. - Additional point surveys (via aquatic weed rake, not divers) were conducted throughout the Tahoe Keys Homeowners Lagoons and Tahoe Keys Marina, including both East and West boating channels. - Environmental DNA (eDNA) water samples were collected from 36 sites along the Upper Truckee River, Trout Creek, Lake Baron, and Sawmill Pond in South Lake Tahoe. To summarize the results of the delineation work outlined above, NZMS were found in the Lake from the east end of Pope Marsh to Ski Run, with a small satellite population at Camp Richardson's. NZMS were observed at depths ranging from 4-150 feet. NZMS were not found at any sites in the Lakewide transect surveys besides within the infested area defined by the grid survey. In the Tahoe Keys, both the East and West boating channels were positive for NZMS but the rest of the sampling sites were negative. All eDNA samples collected were negative for NZMS. The grid survey, Lakewide transect survey, Tahoe Keys point sampling, and expanded eDNA sampling will occur in 2024. |