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Gyrodactylus salaris
   
 
Gyrodactylus salaris in Norway

The leech-like parasite, Gyrodactylus salaris is a salmon killer. It naturally occurs in Russia, Finland and Sweden where it seems to do relatively little harm to salmon. However where it has spread to Norway it has caused devastation to the salmon stocks which appear to be genetically ill-equipped to tolerate its affects. It is very likely that the UK/Ireland salmon population would be similarly affected and it is therefore a very major threat.

Avoiding infected rivers is of paramount importance, and this applies to all river users, not just fishers, but canoeists and even bathers. The 46 rivers in Norway that are infected or have been infected are listed below, however the famous Norwegian salmon rivers such as the Tana, Namsen, Gaula and the Orkla have not been infected, and rightly have strict controls in place whereby visiting anglers must have their equipment disinfected (usually with Virkon) before fishing. Is it time we put these measures in place on our rivers? The only effective treatment of an infected river (known to date) is the complete poisioning of all fish life.

Gyrodactylus salaris infected rivers in Norway. 2007
River Status
   
Ranaelva Infected undergoing treatment
Slettenelva Infected undergoing treatment
Bjerka Infected undergoing treatment
Røssåga Infected undergoing treatment
Bardalselva Infected undergoing treatment
Sannaelva Infected undergoing treatment
Leirelva Infected undergoing treatment
Ranelva Infected undergoing treatment
Lærdalselva Infected undergoing treatment
   
Skibotnelva Infected by Gyrodactylus salaris
Signaldalselva Infected by Gyrodactylus salaris
Hestdalselva Infected by Gyrodactylus salaris
Halsanelva Infected by Gyrodactylus salaris
Drevja Infected by Gyrodactylus salaris
Fusta Infected by Gyrodactylus salaris
Vefsna Infected by Gyrodactylus salaris
Hundåla Infected by Gyrodactylus salaris
Lundselva Infected by Gyrodactylus salaris
Steinkjervassdraget Infected by Gyrodactylus salaris
Figga Infected by Gyrodactylus salaris
Driva Infected by Gyrodactylus salaris
Litledalselva Infected by Gyrodactylus salaris
Usma Infected by Gyrodactylus salaris
Batnordselva Infected by Gyrodactylus salaris
Rauma Infected by Gyrodactylus salaris
Skorga Infected by Gyrodactylus salaris
Innordelva Infected by Gyrodactylus salaris
Henselva Infected by Gyrodactylus salaris
Lierelva Infected by Gyrodactylus salaris
Drammenselva Infected by Gyrodactylus salaris
Sandeelva Infected by Gyrodactylus salaris
   
Lakselva Previously infected, treated and now "cured"
Beiarelva (Beiarn) Previously infected, treated and now "cured"
Fættenelva Previously infected, treated and now "cured"
Langsteinelva Previously infected, treated and now "cured"
Bævra Previously infected, treated and now "cured"
Storelva Previously infected, treated and now "cured"
Måna Previously infected, treated and now "cured"
Valldalselva Previously infected, treated and now "cured"
Taordelva Previously infected, treated and now "cured"
Norddalselva Previously infected, treated and now "cured"
Eidsdalselva Previously infected, treated and now "cured"
Korsbrekkelva Previously infected, treated and now "cured"
Aureelva Previously infected, treated and now "cured"
Vikelva Previously infected, treated and now "cured"
Vikja Previously infected, treated and now "cured"
   

Our thanks go to the Norwegian Directorate for Nature Management for supplying the information. April 2007.

 
Other useful links on Gyrodactylus salaris
Marlab: Fisheries Research Services (FRS)
Environment Agency: A guide to protecting freshwater fish stocks from Gyrodactylus salaris
 
 
         
   


Map of Gyrodactylus salaris distribution in Norway
Map of Gyrodactylus salaris distribution in Norway


Map of rivers in Norway previously infected by GS
Map of rivers in Norway previously infected by Gyrodactylus salaris but now treated and regarded as clear of the parasite.

 

Data and maps kindly supplied by the Norwegian Directorate for Nature Management
April 2007.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


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