date:Aug 16, 2012
Gyrodactylus salaris (Gyro) are parasites that infect salmon in fresh water. In Norway, they have so far proved to be lethal for all concerned strains of Norwegian salmon.
As of 27 October 2011 20 rivers have been recovered after chemical treatment. Steinkjer region has been infected for three years now and is now in the middle of a clean bill of health process, while the Laerdal and Vefsna regions are to be treated for the last time this year.
Gyro fighting is mainly by means of chemical trea