DAO 86:81-86 (2009)  -  DOI: https://doi.org/10.3354/dao02110

NOTE
Outbreaks of an ulcerative and haemorrhagic disease in Arctic char Salvelinus alpinus caused by Aeromonas salmonicida subsp. smithia

E. Goldschmidt-Clermont1, O. Hochwartner2, A. Demarta3, A.-P. Caminada3, J. Frey1,*

1Institute of Veterinary Bacteriology, Vetsuisse Faculty, Laengassstrasse 122, 3012 Berne, Switzerland
2Schwarzenhaidestr. 41, 1230 Vienna, Austria
3Cantonal Institute of Microbiology, Via Mirasole 22A, 6500 Bellinzona, Switzerland
*Corresponding author. Email:

ABSTRACT: Arctic char Salvelinus alpinus farmed in different places in Austria and free of the viral diseases viral haemorrhagic septcaemia (VHS), infectious haematopoietic necrosis (IHN) and infectious pancreatic necrosis (IPN) experienced disease and mortality. Diseased fish showed skin ulceration and pathological signs of sepsis. Aeromonas sp. was isolated as pure culture from the kidney of freshly euthanized diseased fish. Three independent isolates from outbreaks that occurred on 2 of the affected farms were analyzed phylogenetically by DNA sequence analysis of the rrs and gyrB genes and phenotypically with biochemical reactions. All 3 isolates were identified as Aeromonas salmonicida subsp. smithia. Analysis of virulence genes in these isolates revealed the presence of a Type III secretion system as well as several related virulence effector genes including aexT, encoding the Aeromonas exotoxin AexT, aopP and aopH. These genes are characteristic for virulent strains of typical and atypical subspecies of A. salmonicida.


KEY WORDS: Aeromonas salmonicida subsp. Smithia · Arctic char · Bacterial septicaemia · Ulcerative, haemorrhagic disease


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Cite this article as: Goldschmidt-Clermont E, Hochwartner O, Demarta A, Caminada AP, Frey J (2009) Outbreaks of an ulcerative and haemorrhagic disease in Arctic char Salvelinus alpinus caused by Aeromonas salmonicida subsp. smithia. Dis Aquat Org 86:81-86. https://doi.org/10.3354/dao02110

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