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Enterococcus seriolicida sp. nov., a fish pathogen.

R Kusuda1, K Kawai, F Salati

  • 1Fish Disease Laboratory, Faculty of Agriculture, Kochi University, Japan.

International Journal of Systematic Bacteriology
|July 1, 1991
PubMed
Summary
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Researchers identified a novel bacterial species, Enterococcus seriolicida, from diseased fish. This discovery aids in understanding fish diseases and improving aquaculture health.

Area of Science:

  • Microbiology
  • Aquatic Animal Health
  • Bacterial Taxonomy

Background:

  • Bacterial infections pose a significant threat to cultured fish populations, impacting aquaculture productivity.
  • Accurate identification and characterization of bacterial pathogens are crucial for disease management and prevention.

Purpose of the Study:

  • To investigate the properties and taxonomic position of bacterial strains isolated from diseased yellowtail and eels.
  • To determine if these isolates represent a novel species within the Enterococcus genus.

Main Methods:

  • Isolation and characterization of bacterial strains from diseased fish specimens.
  • Phenotypic analysis including Gram staining, catalase test, anaerobic growth, and tolerance tests (NaCl, bile, methylene blue-milk).
  • Genomic analysis including guanine-plus-cytosine (GC) content determination and DNA-DNA hybridization.

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  • Biochemical profiling and Lancefield grouping for taxonomic differentiation.

    • Main Results:

    • Isolates were identified as gram-positive, facultatively anaerobic cocci with specific growth characteristics.
    • Biochemical tests and Lancefield grouping differentiated the isolates from known Enterococcus species.
    • DNA-DNA hybridization values confirmed low relatedness to other Enterococcus species, supporting a new species designation.
    • Guanine-plus-cytosine content was determined to be 44 mol%.

    Conclusions:

    • A novel bacterial species, proposed as Enterococcus seriolicida, was identified from diseased yellowtail and eels.
    • This finding contributes to the taxonomic understanding of Enterococcus and provides a basis for future research into its pathogenicity and control in aquaculture.