WASHINGTON D.C. (WTAQ) - For the first time, the federal government said it found evidence that the invasive Asian carp has reproduced in the Great Lakes watershed.
It happened in the eastern Great Lakes. The U.S. Geological Survey said four grass carp taken from the Sandusky River in Ohio originated at that spot, and were not moved from elsewhere.
The Sandusky is a tributary of Lake Erie.
Grass carp is among several species imported to the U.S. several decades ago. Experts say they're more concerned about keeping big head and silver Asian carp out of the Great Lakes -- because they're more likely to eat the food that native fish rely upon.
However, scientist Duane Chapman says the silver and big head fish have spawning requirements which are similar to the grass carp. Once they become established in the Great Lakes, Chapman says all Asian carp species will be difficult to control.
That's the fear of Wisconsin and other Midwest states concerned about the Lake Michigan fishing industries.