The Wisconsin Department of Natural Resources (DNR) announced that fish collected during the recent die-off in the Fox River and lower Green Bay waters were diagnosed with severe cases of the bacterial disease columnaris.

Reports of dead fish began June 18, leading DNR staff to conduct a two-week investigation into the cause of death. While it initially appeared that species other than channel catfish, such as carp and sheepshead, were affected, an estimated 99% of dead fish found over the course of the investigation were adult channel catfish. Only four of the dead channel catfish reported were suitable for testing.

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