Butler Lake is an activeeco-system that requires regular management during typical conditions, and alsowhen weather changes the normal balance of growth. The Village retains,Clarke Aquatic Services, to manage the lake vegetation during the summer monthsand they recently treated the water lilies and coon tail. The resultingvegetation dieback reduced the dissolved oxygen levels, which was believed tohave adversely impacted the fish population. No applications to the lakedirectly harmed the fish. Village Parks Maintenance staffhave been and will continue to remove the fish that have perished. TheIllinois Department of Natural Resources (IDNR) is fully aware of the situationand investigated the lake and the fish situation earlier in the week. TheIDNR indicates that this happens from time to time when a body of water isoverpopulated with vegetation. The IDNR and the Village will continue tomonitor the fish variety and population. The dead vegetation will sink tothe bottom and decay and the dissolved oxygen levels will normalize.