The fish was found less than two miles south of a temporary electrical barrier strung across the shipping canal bottom near Romeoville to keep so-called "Frankenfish" predators away from the $4.5 billion commercial and sport Lake Michigan fishery, the Chicago Tribune said.
Silver carp are voracious and can reach 60 pounds and four feet in length. Only one dead carp was found this week but federal and state officials plan to sweep the canal to see if any others are in the area.
The U.S. Army Corps of Engineers is building a permanent electrified barrier to stop the aggressive fish from reaching the Great Lakes.
Asian carp have been migrating north since escaping from fish farms during flooding along the Mississippi River.