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Geist Reservoir has an unwanted visitor that may never leave: the dreaded Zebra mussel (Dreissena polymorpha)

Zebra mussels are very prolific breeders, with adult females producing anywhere from 30,000 to 1.6 million eggs per year. The zebra mussel is a filter feeder, with each adult capable of clearing the algae from a quart of water each day. A thousand zebra mussels can thus filter 250 gallons of water each day.

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