Low oxygen levels blamed for Mason City fish kill - KWWL - Eastern Iowa Breaking News, Weather, Closings

Low oxygen levels blamed for Mason City fish kill

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MASON CITY (KWWL) -

Fish are dying in a Mason City park, and officials say low oxygen levels are to blame.

The Iowa Department of Natural Resources have been investigating the fish kill at a pond in Lester Milligan Park in Mason City. 

They say water samples taken on Saturday showed low oxygen levels. It's known as oxygen sag. 

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