From this story in the Christian Science Monitor:
_Federal officials are starting a four-day intensive fishing expedition Monday to determine whether the Asian carp has infiltrated water locks that are designed to keep the invasive species from entering Lake Michigan, a scenario that neighboring states say would wreak havoc on the lake's fragile ecosystem. The search effort is in response to discoveries of Asian carp DNA in June and July, all in Lake Calumet, a body of water located about six miles below Lake Michigan but directly connected to it through the Calumet-Sag Channel. That waterway intersects the Chicago Sanitary and Ship Canal, a man-made channel that connects Lake Michigan with the Mississippi River.
_Biologists from the US Fish and Wildlife Service, the US Army Corps of Engineers , and the Illinois Department of National Resources will join commercial fisherman and biologists from Southern Illinois University in the expedition through Lake Calumet and surrounding waterways. Their activities will include laying half-mile-wide nets to sweep large portions of the lake as well as sampling fish along the shoreline through electrofishing. The search is scheduled to continue through Thursday.
Let's hope they're wearing helmets...