Diseases of farmed Atlantic salmon Salmo salar associated with infections by the microsporidian Paranucleospora theridion

The microsporidian Paranucleospora theridion was discovered in Atlantic salmon Salmo salar suffering from proliferative gill disease in a marine farm in western Norway in 2008. The parasite develops in cells of the reticuloendothelial system, cells important for normal immune function. The aim of th...

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Bibliographic Details
Published in:Diseases of Aquatic Organisms
Main Authors: Nylund, Stian, Andersen, Linda, Sævareid, I., Plarre, Heidrun, Watanabe, Kuninori, Arnesen, Carl E., Karlsbakk, Egil, Nylund, Are
Format: Article in Journal/Newspaper
Language:English
Published: Inter-Research 2011
Subjects:
atlantisk laks
atlantic salmon
fish diseases
fiskesykdommer
disease treatment
sykdomsbehandling
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923
Norway
Atlantic salmon
Salmo salar
Online Access:http://hdl.handle.net/11250/109128
https://doi.org/10.3354/dao02313
Description
Summary:The microsporidian Paranucleospora theridion was discovered in Atlantic salmon Salmo salar suffering from proliferative gill disease in a marine farm in western Norway in 2008. The parasite develops in cells of the reticuloendothelial system, cells important for normal immune function. The aim of this study was to see if P. theridion could play a part in some of the diseases with unclear causes in salmon production in Norway, i.e. proliferative gill disease (PGI), pancreas disease (PD), heart and skeletal muscle inflammation (HSMI) and cardiomyopathy syndrome (CMS). P. theridion was present in all areas with salmon farming in Norway, but high prevalence and densities of the parasite in salmon and salmon lice were only seen in southern Norway. This region is also the main area for PGI and PD in Norway. Quantification of pathogens associated with PGI, PD, HSMI and CMS diagnoses showed that P. theridion levels are high in southern Norway, and may therefore play a role in susceptibility and disease development. However, among the different diagnoses, fish with PGI are particularly heavily infected with P. theridion. Therefore, P. theridion appears as a possible primary agent in cases with high mortality in connection with PGI in western Norway. 2016-03-16

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