First description of atypical furunculosis in freshwater farmed Atlantic salmon, Salmo salar L., in Chile

M. Godoy, V. Gherardelli, A. Heisinger, J. Fernández, P. Olmos, L. Ovalle, P. Ilardi, R. Avendaño-Herrera

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

We report the first isolation, identification and characterization of a group of Chilean strains of atypical Aeromonas salmonicida isolated from freshwater farmed Atlantic salmon, Salmo salar. Affected fish showed superficial ulcers and pale liver with or without petechial haemorrhages. Outbreaks of the disease occurred in two farms in the south of Chile about 2200 km apart. Five strains were isolated in pure culture and identified by serological assays and immunofluorescence tests as belonging to Aeromonas salmonicida. Although the bacterial isolates were phenotypically homogeneous, minor differences with the reference strain A. salmonicida subsp. salmonicida ATCC 33658 were noted. Three specific primer sets and partial 16S rRNA gene sequencing allowed the identification of the Chilean isolates as atypical A. salmonicida, with A. salmonicida subsp. achromogenes and A. salmonicida subsp. masoucida as their closest relatives (100% sequence similarity). Molecular typing indicated that the atypical isolates belong to two genetic groups that were associated with the geographical origin.

Original languageEnglish
Pages (from-to)441-449
Number of pages9
JournalJournal of Fish Diseases
Volume33
Issue number5
DOIs
Publication statusPublished - May 2010

Keywords

  • Aeromonas salmonicida
  • Atlantic salmon
  • Atypical furunculosis
  • Chile
  • Fresh water

ASJC Scopus subject areas

  • Aquatic Science
  • veterinary (miscalleneous)

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