For the first time in decades, ‘do not eat’ advisory removed for Illinois River fish

Predatory fish — which build up methylmercury by eating other fish — include: all species of black bass and gar, striped bass, white bass, hybrid striped bass, walleye, sauger, saugeye, flathead catfish, muskellunge and northern pike. Larger fish tend to harbor the most methylmercury.