|The Pennsylvania Zebra and Quagga Mussel Monitoring Network is dedicated to protecting Pennsylvania's aquatic habitats from the threat of two harmful aquatic invasive species (AIS), zebra and quagga mussels.|
In the Great Lakes region alone, Ohio Sea Grant estimates that water users spend more than $30 million each year for treatments to control zebra mussels. These mussels clog water intake pipes and disrupt aquatic communities by filtering food that native species rely upon. After storm events, beaches are littered with sharp shells that can injure beach goers walking barefoot.
Zebra mussels probably came to the Great Lakes in the ballast tanks of ships. They were first discovered in Lake St. Clair in 1988, and then found in Lake Erie in the late 1980's. In 1991, quagga mussels were found in Lake Erie. Since then, invasive mussels have spread and become established in several inland lakes and rivers in Pennsylvania. See the complete timeline for zebra mussels and quagga mussels in Pennsylvania at the USGS web site.
How do zebra mussels and quagga mussels spread to new locations?
Why is monitoring important?
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