The whirling disease parasite, Myxobolus cerebralis, is native to Europe and was first described in Germany in 1903.
The parasite is now distributed on nearly every continent and in more than 30 countries.
Impacts to wild trout and aquaculture vary widely from one location to another. In many countries, the parasite is considered fairly benign. In others, it is considered an invasive species.
For more information, visit the Global Invasive Species Database