Whirling Trout Disease by Katherine Babcock | May 9, 2024 | Invasive Species, News The Wisconsin DNR discovered a trout parasite in wild trout in southwestern Langlade County. It can lead to what’s called “whirling disease” in select species of fish. https://www.wxpr.org/energy-environment/2024-04-05/parasite-found-in-wild-trout-in-langlade-county