Minnesota Aquatic Invasive Species Research Center (MAISRC)
Saving our lakes, one tiny weevil at a time
If you paddle or swim on Cedar Lake in Minneapolis, you may have noticed this unusual sight: three large, black rings floating on top of the water.
These enclosures are serving as a temporary research lab for Dr. Ray Newman and his team as they study the effect that the tiny milfoil weevil has on invasive Eurasian watermilfoil. Each enclosure was stocked with a different number of sunfish, which eat the native weevils, which in turn eat the milfoil. Researchers will study the changes in milfoil density as summer progresses.