600 Trout Found Dead in a Wisconsin Creek

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The Wisconsin Department of Natural Resources (DNR) is investigating a fish kill that claimed hundreds of trout in a part of the state known for great fly fishing. According to a WDNR press release, the die-off occurred on Isabelle Creek—a small tributary stream that flows through the Kinnickinnic River Region.

“DNR staff observed dead fish in Isabelle Creek flowing south along County Road C in Ellsworth,” the press release states. “So far, DNR staff have observed over 600 dead trout and a variety of dead forage fish species in Isabelle Creek. DNR staff has been onsite several times since August 17.”

The Isabelle is a lesser-known stream in an area characterized by more famous trout waters like the Rush River, the Trimbelle River, and the main stem of the Kinnickinnic. The Isabelle sits on the northwestern edge of the Driftless Area, and, while small, it can produce fantastic fishing. According to the WDNR, parts of the stream provide important habitat for spawning trout. 

An employee of a local fly shop located about 25 miles northwest of the Isabelle tells Field & Stream that the creek is home to both brown and brook trout. “People primarily fish for the brown trout that were stocked once upon a time,” says Brian Schubert of Lund’s Fly Shop in River Falls, Wisconsin. “As far as I know, they are naturally producing brown trout from original stocking genetics.”

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Schubert believes that the die-off could have a significant impact on the fishing on Isabelle Creek. “It’s not a really high-density stream,” he says. “For a stream of its size, 600 is a big number. Depending on the area of the stream affected, it could have a very serious impact on the stream’s trout population.” 

Just last week, the WDNR announced that the fish killed in another recent die-off along the Fox and Green Bay Rivers succumbed to a bacterial disease known as columnaris. While no estimated total number of dead fish was provided, local media outlets described that event as a “large-scale fish kill” affecting primarily adult channel catfish. The DNR declined to provide Field & Stream with further details about what may have caused the Isabelle Creek die-off and say the investigation is still ongoing. The agency will share additional details as they emerge. 





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