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DAO 33:101-109 (1998)
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Abstract
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Pathology attributed to Mycobacterium chelonae infection among farmed and laboratory-infected Atlantic salmon Salmo salar
D. W. Bruno1,*, J. Griffiths1, C. G. Mitchell1, B. P. Wood1, Z. J. Fletcher1, F. A. Drobniewski2, T. S. Hastings1
1FRS Marine Laboratory, PO Box 101, Victoria Road, Aberdeen AB11 9DB, Scotland, UK
2PHLS Mycobacterium Reference Unit, Dulwich Public Health Laboratory, King's College School of Medicine, Dulwich Hospital, London SE22 8QF,
England, UK
*E-mail: brunodw@marlab.ac.uk
ABSTRACT: This study was promoted following concern over increasing mortality on 2 farms rearing Atlantic salmon Salmo salar in the Shetland Isles, Scotland. A Mycobacterium sp. was isolated from moribund, market-sized Atlantic salmon. Biochemical
tests, lipid analysis and PCR (polymerase chain reaction) techniques confirmed the bacterium to be Mycobacterium chelonae. Multiple greyish-white miliary granuloma-like nodules were observed in several tissues. Dense hard-packed nodules contained
abundant acid-fast bacteria. Atlantic salmon injected with M. chelonae remained sub-clinically infected, demonstrating the chronic nature of this disease. The source of the pathogen was not identified.
KEY WORDS: Mycobacteriosis · Mycobacterium chelonae · Atlantic salmon · Pathology · PCR
Published in DAO Vol.
33, No. 2
(1998) on June 19
ISSN: 0177-5103.
Copyright © Inter-Research, Oldendorf/Luhe, 1998
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