Among the dead fish is one that appears to have been there a while, and it maybe a 'Big Head' Asian Carp.
A fisherman brought it to Henry's Sport and Bait on South Canal Thursday. Their scale tops out at 70 lbs., and the fish weighs more than that.
One of the store's owners explained how the fish may have gotten into the lagoon.
"Somewhere along the line, it's believed that Illinois DNR [Department of Natural Resources], when they brought catfish in, brought some young Asian Carp in as well with those fish," said Tom Palmisano of Henry's Sports and Bait shop.
Someone from the Department of Natural Resources will be at the store on Monday to verify that the fish is a Big Head Asian Carp.
This species is not the one officials are concerned about threatening Lake Michigan.