Invasive Mussels Detected In Lake Powell
Boaters Asked To Inspect Their Vessels For Mussels
PAGE, Ariz. – New test results indicate the presence of an extremely small number of individual, larval quagga or zebra mussels in Lake Powell. Two cooperative research and monitoring efforts, conducted on July 19 and 30 by the U.S. Geological Survey, the National Park Service, and the Utah Division of Wildlife Resources, detected three individual mussel larvae at the Wawheap Marina and near the Glen Canyon Dam.
Dr. David Britton, an expert on quagga and zebra mussels for the U.S. Fish
“We do not know at this point if an established population is present. We also do not know for certain how quagga or zebra mussels will affect Lake Powell.”
Samples Being Analyzed
Five water samples were collected from Lake Powell and analyzed by a Bureau
Three of these samples did not indicate the presence of any quagga or zebra mussels. Two of the samples, collected at the Wahweap Marina and near the Glen Canyon Dam, indicated the presence of three individual larval mussels when tested with the microscopic method and DNA fingerprint technology.
The testing methods cannot distinguish whether or not these are quagga mussels or zebra mussels, which are closely related.
“Additional samples have been collected from Lake Powell and are being analyzed for quagga and zebra mussels. In the coming weeks, more samples will be collected from various locations around the lake to determine if mussels are present in other areas,” said Kitty Roberts, superintendent of Glen Canyon National Recreation Area.
The National Park Service, Utah Division of Wildlife Resources, Arizona
Prevention Program Remains In Place
The National Park Service’s existing quagga and zebra mussel prevention
High pressure, hot water decontamination stations are available at all marinas
As a preventative measure, the National Park Service will also begin requiring any boats that are slipped or moored in Lake Powell to receive a decontamination wash before they exit the park if they are being moved to a non-infested lake.
In addition, people with boats in the marinas at Lake Powell are strongly encouraged to conduct a thorough inspection of their boat to look for quagga or zebra mussels which may be attached.
To prevent quagga mussels or any other aquatic nuisance species from being
Any other gear that has come into contact with the water – such as waders or fishing equipment – should also be washed. The boat and all gear should be allowed to thoroughly dry in the sun for at least five days before being used in another water body.
Detailed descriptions about how to clean your boat and equipment are available online at: www.wildlife.utah.gov/quagga/pdf/boat_inspection.pdf. Further information about quagga and zebra mussels and how to prevent their spread is available online at www.100thmeridian.org, www.protect yourwaters.net, and www.nps.gov/glca.
Search For Quagga Or Zebra Mussels Continues
The search for adult quagga or zebra mussels is continuing at
They have been carefully inspecting boats, cables, and dock structures. As
Additional sampling for microscopic larval mussels is also continuing in
Most of the samples are being sent to a Bureau of Reclamation laboratory in
On Aug. 15, a boat with quagga mussels attached to it arrived at Glen Canyon National Recreation Area. The boat had come from Lake Mead, where it had been moored since April.
The boat was fully decontaminated by ARAMARK at the new Wahweap decontamination station before it was permitted to launch into Lake Powell. This was the second boat this year that had come to Glen Canyon with quagga mussels visibly attached.
Superintendent Kitty Roberts reminds visitors that, “We are still actively
For more information and answers to frequently asked questions on this topic, visit www.nps.gov/glca