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

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Both quagga pictured and zebra mussels originated in Eurasia in the Caspian Ural and Baltic seas and spread to the United States in ballast water from freighters. Credit: Natalie Muth Utah Division of Wildlife Resources
Both quagga, pictured, and zebra mussels originated in Eurasia in the Caspian, Ural and Baltic seas and spread to the United States in ballast water from freighters. Credit: Natalie Muth, Utah Division of Wildlife Resources

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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