Voracious bighead and silver carp from Asia have been migrating up the Mississippi and Illinois rivers and may be within six miles of Lake Michigan.
Swanson notes that Minnesota has 140 miles of Lake Superior shoreline. She says that if Asian carp invade the Great Lakes, they'll gain access to the rivers and tributaries that feed Lake Superior, as well as inland waters.
Ohio, Wisconsin and Pennsylvania in the last week have filed similar motions with the Supreme Court.
Published at 2:14 PM CST on Dec 28, 2009 | Updated at 2:30 PM CST on Dec 28, 2009