Researchers have found that ticks that were once isolated to southern Illinois are now being found in the northern part of the state and vice versa.
Illinois Department of Public Health
Especially the “Do Not Eat” ones. Instead, what you have are would-be anglers who are afraid to even touch the fish, much less eat them.
Changes are the result of continued sampling by the Fish Contaminant Monitoring Program and do not suggest that Illinois fish are becoming more or less contaminated.