Kevin Irons, an official with the Illinois Department of Natural Resources, tells NPR that tests of the fish and its surrounding waters are now underway and further information will be released soon.

"There are seven species of carps native to Asia that have been introduced to the United States," explains the ACRCC, a group composed of federal and local agencies, "but only four types that are considered a threat to the Great Lakes: bighead, silver, black and grass."