Asian carp

Rebecca Williams / Michigan Radio

The U.S. Army Corps of Engineers is figuring out new ways to try to block two species of Asian carp — bighead and silver — from getting into Lake Michigan. The Corps also wants to block other aquatic nonnative species from getting into the Lakes from the Mississippi River system.

They’re considering whether to put in new barriers near the Brandon Road Lock and Dam in the Des Plaines River near Chicago. The site is about five miles downstream from a system of electric barriers in the Chicago Ship and Sanitary Canal. Those barriers are essentially the last line of defense against Asian carp in the Chicago area.

“This may be a perfect site to implement a range of different kinds of technologies," says Dave Wethington, a project manager with the Army Corps in Chicago.

He says the Corps could put in barriers that block fish passage into the lock and dam, or more electric barriers. It could also put in special water guns that use pressure waves to deter carp.

Michigan Department of Natural Resources

The most recent round of environmental DNA sampling on the Kalamazoo River showed no evidence of genetic material from Asian carp, according to the Michigan Department of Natural Resources.

Ed Golder, spokesperson for the department, says this is very good news, "but it doesn't mean that we're going to stop being vigilant about the concern that Asian carp generally, and silver carp and big head carp in particular, pose to the Great Lakes."