Pancreas disease in farmed Atlantic salmon, Salmo salar L., and rainbow trout, Oncorhynchus mykiss (Walbaum), in Norway

The present paper describes, for the first time, clinical signs and pathological findings of pancreas disease (PD) in farmed Atlantic salmon, Salmo salar L., and rainbow trout, Oncorhynchus mykiss (Walbaum), in sea water in Norway. Similarities and differences with reports of PD from Ireland and Sco...

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Veröffentlicht in:Journal of fish diseases Jg. 30; H. 9; S. 545 - 558
Hauptverfasser: Taksdal, T, Olsen, A B, Bjerkås, I, Hjortaas, M J, Dannevig, B H, Graham, D A, McLoughlin, M F
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Oxford, UK Blackwell Publishing Ltd 01.09.2007
Schlagworte:
Alphavirus - isolation & purification
Alphavirus Infections - pathology
Alphavirus Infections - veterinary
Alphavirus Infections - virology
Animals
Atlantic salmon
Brackish
Chemical analysis
Fish Diseases - epidemiology
Fish Diseases - pathology
Freshwater
Heart - virology
immunohistochemistry
Kidney - pathology
Kidney - virology
Marine
Muscle, Skeletal - pathology
Muscle, Skeletal - virology
Myocardium - pathology
Norway - epidemiology
Oncorhynchus mykiss
Outbreaks
Pancreas - pathology
Pancreas - virology
pancreas disease
Pancreatic Diseases - epidemiology
Pancreatic Diseases - pathology
Pancreatic Diseases - veterinary
Pancreatic Diseases - virology
pathology
rainbow trout
Salmo salar
Salmon
Salmonid alphavirus
Seawater
Spleen - pathology
Spleen - virology
Water analysis
Norway
ANE, Norway
ANE, Eire
ANE, British Isles, Scotland
ISSN:0140-7775, 1365-2761
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Zusammenfassung:The present paper describes, for the first time, clinical signs and pathological findings of pancreas disease (PD) in farmed Atlantic salmon, Salmo salar L., and rainbow trout, Oncorhynchus mykiss (Walbaum), in sea water in Norway. Similarities and differences with reports of PD from Ireland and Scotland are discussed. Samples of 68 rainbow trout from disease outbreaks on 14 farms and from 155 Atlantic salmon from outbreaks on 20 farms collected from 1996 to 2004 were included in the present study. The histopathological findings of PD in Atlantic salmon and rainbow trout in sea water were similar. Acute PD, characterized by acute necrosis of exocrine pancreatic tissues, was detected in nine Atlantic salmon and three rainbow trout. Salmonid alphavirus (SAV) was identified in acute pancreatic necroses by immunohistochemistry. Most fish showed severe loss of exocrine pancreatic tissue combined with chronic myositis. Myocarditis was often but not consistently found. Kidneys from 40% and 64% of the rainbow trout and Atlantic salmon, respectively, had cells along the sinusoids that were packed with cytoplasmic eosinophilic granules. These cells resembled hypertrophied endothelial cells or elongated mast cell analogues. Histochemical staining properties and electron microscopy of these cells are presented. SAV was identified by RT‐PCR and neutralizing antibodies against SAV were detected in blood samples.
Bibliographie:ark:/67375/WNG-Z1C4T2G8-7
istex:DFB2803928A1478714D16B33118633802C103095
ArticleID:JFD845
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0140-7775
1365-2761
DOI:10.1111/j.1365-2761.2007.00845.x