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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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Common Aquatic Bacteria Responsible for Fish Kill - Test results from fish sampling suggest the recent Spofford Lake fish kill resulted from the presence of a common aquatic bacteria combined with a time of year when fish were stressed from spawning activity and war water temperatures. Test results showed that no virus was present in the fish tested and that the bacteria found was Aeromonas Hydrophila. According to Fish Health Center Staff, this bacteria only becomes lethal to fish when there is another stressor to the fish. In some cases, the bacteria can infect a single fish and then multiply rapidly, causing a substantial fish kill.


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