Zebra mussels dip on Lake Mille Lacs
The number of zebra mussels in 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.
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