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Zebra Mussels Dip On Lake Mille Lacs

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(credit: CBS)

(credit: CBS)

AITKIN, Minn. (AP) — The number of zebra mussels on Lake Mille Lacs has dropped this year for the first time since they were found in 2005.

Minnesota outdoors officials say a survey this week found about 1,070 zebra mussels per square foot. That’s down by about 200 from a year ago.

Department of Natural Resources treaties manager Tom Jones says it’s typical for an invading species to ramp up in big numbers and then fall back a bit. Jones says in other places invasives have often dropped by as much as a third after initial expansion.

Jones tells Minnesota Public Radio that researchers will need more data next year to see if this year is the start of a decline or a one-time thing.

(© Copyright 2013 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)

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