Quagga mussels threaten western U.S. waters, researcher reports

Pipe-clogging invasive mussels caused up to $1.5 billion in damage across 23 states between 1989 and 2007. Now, fingernail-sized quagga mussels, a close relative of zebra mussels, have spread to the West and threaten to do even more damage.

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<p><a href="http://www.physorg.com/news134144260.html">Quagga mussels threaten western U.S. waters, researcher reports</a></p> <p>Pipe-clogging invasive mussels caused up to $1.5 billion in damage across 23 states between 1989 and 2007. Now, fingernail-sized quagga mussels, a close relative of zebra mussels, have spread to the West and threaten to do even more damage.</p>