- Associated Press - Wednesday, September 17, 2014

MANTENO, Ill. (AP) - Dead fish found floating in the small lake south of Lake Manteno likely were killed by herbicides, according to the Illinois Department of Natural Resources.

On Sept. 11, fish began to swim to the surface of the lake in search of oxygen, and started dying off the following day. One resident told The (Kankakee) Daily Journal (https://bit.ly/1pjPtc7 ) on Sunday that he has removed at least 800 pounds of dead fish.

Consumer products used to kill weeds didn’t directly hurt the fish, according to fisheries biologist Dan Stephenson, but the bacteria that causes vegetation to decompose can use up a lot of oxygen. The shallow depth of the small lake was another major contributor, he said.

Not all of the fish in the lake will die, but the bigger ones are more at risk, he said.

“Any time you get a fish kill, it never gets 100 percent of those fish,” he said.

Stephenson estimates the lake will recover within three of four years.

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Information from: The Daily Journal, https://www.daily-journal.com

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