Whirling Disease

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AZFG WD- Deformed Face.jpg


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