Northwest Iowa Fish Kill Investigation
August 20, 2018
A fish kill was reported on the North Fork of the Floyd River about seven miles northeast of Sheldon Saturday. DNR staff found dead fish from close to the intersection of the North Fork and Floyd River, continuing for about four miles downstream in the Floyd River. The investigation resumed Monday, but no pollutant has been identified.
Field tests show water in the North Fork of the Floyd has high dissolved oxygen and low ammonia levels Monday, but says recent rainfalls have likely diluted the pollutant.
Areas further downstream were low in oxygen and high in ammonia, indicating a pollutant. Laboratory results will be available next week.
The DNR will continue to investigate to locate the source of the pollutant.
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