Suburban Chicago Lake's Fish Kill Sparked by Herbicide Treatment

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Suburban Chicago Lake's Fish Kill Sparked by Herbicide Treatment

A suburban Chicago official says hundreds of fish died in the community's lake when oxygen levels plummeted after an herbicide was applied to combat aquatic plants.

About 400 fish, including largemouth bass, died last week in Libertyville's Butler Lake soon after a company applied a chemical that's designed to control invasive weeds, including the lake's excessive growth of water lilies.

Libertyville public works director Paul Kendzior tells The Daily Herald that the vegetation die-off caused dissolved oxygen levels to fall, depriving fish of oxygen and killing them. He says the herbicide application itself didn't directly harm the fish.

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Failing Lakes in Florida - The United States Environmental Protection Agency has set limits on the concentrations of total nitrogen, total phosphorus, and algal chlorophyll allowed in Florida lakes starting in March 2012. If one or more of the respective concentrations exceeds these criteria, the lake is considered to be impaired due to pollution and subject to a variety of regulatory actions.

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