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Diseases of Aquatic Organisms

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DAO 33:63-66 (1998)  -  doi:10.3354/dao033063

Systemic spironucleosis in sea-farmed Atlantic salmon Salmo salar, caused by Spironucleus barkhanus transmitted from feral Arctic char Salvelinus alpinus?

Erik Sterud1,*, Tor Atle Mo2, Trygve T. Poppe1

1Norwegian College of Veterinary Medicine, PO Box 8146 Dep., N-0033 Oslo, Norway
2National Veterinary Institute, PO Box 8156 Dep., Oslo, Norway

A hexamitid flagellate was found in the gall bladder and intestine of Arctic char Salvelinus alpinus in northern Norway. Scanning and transmission electron microscopy showed this flagellate to be identical to Spironucleus barkhanus from grayling Thymallus thymallus and farmed Atlantic salmon Salmo salar. It is hypothesised that systemic spironucleosis in sea-caged Atlantic salmon was due to transmission of flagellates from feral char to the salmon.

Hexamita · Flagellate · Diplomonadida · Ultrastructure · Grayling · Aquaculture

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