Journal
JOURNAL OF FISH DISEASES
Volume 34, Issue 10, Pages 769-781Publisher
WILEY
DOI: 10.1111/j.1365-2761.2011.01293.x
Keywords
16S rDNA; Atlantic salmon; Hsp65; mycobacteriosis; Mycobacterium salmoniphilum; pathology; phylogeny; rpoB
Funding
- Norwegian Research Council [1588823]
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Multiple greyish-white visceral nodules containing abundant rapidly growing and acid-fast bacteria, subsequently identified as Mycobacterium salmoniphilum, were detected in moribund and newly dead market-sized fish during a period of increased mortality in an Atlantic salmon, Salmo salar, farm in western Norway. Isolates cultured from diseased fish were phenotypically consistent with Mycobacterium sp. previously isolated from Atlantic salmon [MT 1890 (= NCIMB13533), MT1892, MT1900 and MT1901] in the Shetland Isles, Scotland. Partial sequences of 16S rDNA, ribosomal RNA internal transcribed spacer (ITS1), 65-kDa heat-shock protein (Hsp65) and beta subunit of RNA polymerase (rpoB) revealed 97-99% similarity with M. salmoniphilum type strain ATCC 13758(T). The source of infection was not confirmed. Koch's postulates were fulfilled following experimental challenge of Atlantic salmon with field isolate NVI6598 (FJ616988). Mortality was recorded in experimentally infected fish; however, the infection remained subclinical in the majority of affected fish over the 131-day challenge period.
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