What is Whirling Disease?

What is Whirling Disease?

(551K pdf file)


Whirling disease is the common name for an infection in salmonids caused by the protozoan, Myxobolus cerebralis. Diseased fish usually show signs of circular swimming, hence the disease name “whirling.”

This publication, What is Whirling Disease?, outlines the following topics

  • Which salmonids species are susceptible
  • What age of salmonids are susceptible
  • How the disease is spread
  • If the disease is dangerous to humans
  • How fish farmers can avoid whirling disease infection
  • Regulations in Michigan and other North Central states concerning fish farms with whirling disease.

Published: December 2004
Publication Number: FS113
Author: Mohamed Faisal and Donald Garling