Great Lakes Open Lakes Trend Monitoring Program: Total Chlordane
In 1983, the U.S. banned chlordane, an insecticide, except for killing termites. In 1988, chlordane became illegal to use at all. Since its ban, chlordane levels slowly declined in whole Lake Trout and Walleye. Chlordane in fish seemed to have evened out, showing no significant increase or decrease. Lake Michigan trout have the highest levels, followed by Lake Ontario, with average levels in Lakes Superior, Huron, and Erie fish.