Whirling Disease

• Whirling Disease AZ Game and Fish
• State of Colorado Parks and Wildlife- Whirling Disease and Colorado's Trout

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Cliff Note Version

• Whirling disease is a parasitic condition affecting fish, primarily rainbow trout.
• Now found in at least 20 states.
• Young fish are at greatest risk.
• First observed in the United States around 1958.
• Larger infected fish generally don't die but are carriers of the disease.
• Warm-water fish such as bass, walleye and catfish are not affected.
• Currently, No practical cure to treat wild trout infected with the disease.
• Once the disease parasite is established in the wild, it can persist indefinitely