The U.S. Army Corps of Engineers is taking some innovative, and perhaps unusual, steps to keep Asian carp (the silver and bighead carp in particular) from infesting the Great Lakes.
In the next several years several layers of protection will be used to thwart the arrival of the carp by way of the Chicago-area rivers and canals.
Speakers will be used to emit noise designed to turn the fish away. If the noise won’t drive them away, then perhaps the second layer of defense, a curtain of bubbles will. And if neither are successful, an electric barrier will make up the third layer to deter the invasive carp.