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Mark Anderson pulls a quagga mussel monitoring device from dozens of feet below the surface of Lake Powell.

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Losing Lake Powell’s invasion battle, but trying to win the war

Quagga mussels can disrupt dam flow, remove nutrients and oxygen

Ecologist Mark Anderson still sometimes tears up thinking about March 3, 2013, when an adult quagga mussel was discovered — the definitive sign of a possible aquatic apocalypse — clinging to a boat hauled from the waters of Lake Powell.