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Diseases of Aquatic Organisms

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DAO 145:1-13 (2021)  -  DOI: https://doi.org/10.3354/dao03597

Experimental challenge of Atlantic salmon Salmo salar using clones of Paramoeba perurans, P. pemaquidensis and Tetramitus sp.

Are Nylund1,*, Martin Røed1, Steffen Blindheim2, Christiane Trösse1, Linda Andersen2

1Department of Biology University of Bergen, 5020 Bergen, Norway
2The Industrial and Aquatic Laboratory (ILAB), Thormøhlensgt 55, 5006 Bergen, Norway
*Corresponding author:

ABSTRACT: Salmon gill disease in Norway is in most cases associated with a range of different pathogens, stress and environmental factors. Paramoeba perurans and other amoebae have been isolated during such disease outbreaks. Other amoebae isolated from salmon with gill disease in Norway include P. pemaquidensis, Tetramitus sp. and Vannella sp. Here we tested the pathogenicity of the first 2 species in challenge experiments. We found that even when clonal cultures of P. pemaquidensis established an infection on the gills of salmon, it failed to cause gill disease, while Tetramitus sp. appeared to be unable to establish a lasting infection on the gills of healthy salmon. The result of the challenge with P. pemaquidensis confirms the results of similar studies performed in the USA and in Australia. Tetramitus sp. is probably a common amoeba in the marine environment, and its presence on the gills of farmed salmon may just be accidental. Based on this study, we conclude that P. perurans is the only known amoeba in marine salmon farming associated with amoebic gill disease in Norway.


KEY WORDS: Salmo salar · Amoebic gill disease · Paramoeba pemaquidensis · P. perurans · Tetramitus sp. · Vannella sp. · Virulence


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Cite this article as: Nylund A, Røed M, Blindheim S, Trösse C, Andersen L (2021) Experimental challenge of Atlantic salmon Salmo salar using clones of Paramoeba perurans, P. pemaquidensis and Tetramitus sp.. Dis Aquat Org 145:1-13. https://doi.org/10.3354/dao03597

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