Weather Updates

Asian carp reproducing in Great Lakes watershed: experts

This June 22 2012 phoshows researcher holding an Asian carp pulled from Illinois River near HavanIll.  Scientists network field

This June 22, 2012, photo shows a researcher holding an Asian carp pulled from the Illinois River near Havana, Ill. Scientists at a network of field stations on the Mississippi and Illinois rivers are using electric currents to stun fish so they can be scooped up and examined. Researchers have been monitoring fish populations on the rivers for many years and now are looking for evidence that native species are being affected by the arrival of invasive Asian carp. (AP Photo/Robert Ray)

storyidforme: 56996625
tmspicid: 12233101
fileheaderid: 5577966
Article Extras
Story Image

Updated: October 28, 2013 12:54PM

TRAVERSE CITY, Mich. — Federal scientists say they’ve found evidence for the first time that Asian carp have reproduced successfully within the Great Lakes watershed.

U.S. Geological Survey experts reported Monday that four grass carp taken from the Sandusky River in Ohio originated there and are the result of normal reproduction.

Grass carp are among several invasive species imported to the U.S. from Asia decades ago.

Experts are more concerned about keeping bighead and silver carp out of the Great Lakes because they eat plankton that is crucial for other fish. But scientist Duane Chapman says bighead and silver carp have similar spawning requirements to grass carp.

He says the discovery indicates that controlling Asian carp will be difficult if they become established in the Great Lakes.

© 2014 Sun-Times Media, LLC. All rights reserved. This material may not be copied or distributed without permission. For more information about reprints and permissions, visit To order a reprint of this article, click here.