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Is Shewanella oncorhynchi a fish health threat? Possible genetic background of pathogenicity and common carp challenge Cover

Is Shewanella oncorhynchi a fish health threat? Possible genetic background of pathogenicity and common carp challenge

Journal of Veterinary Research
Volume 69 (2025): Issue 3 (September 2025)
By:
Open Access
|Aug 2025

Figures & Tables

Fig. 1.

Lesions observed in common carp challenged with Shewanella oncorhynchi: group A (bacterium strain K999) – swollen abdomens, discolorations of the skin, lens opacity and swelling of the kidneys; group B (strain K313) – slightly swollen abdomens, discolorations of the skin, lens opacity and swelling of the kidneys; group C (strain K61) – slightly swollen abdomens, lens opacity, swelling of the kidneys, skin lesions and discolorations; group K – no lesions
Lesions observed in common carp challenged with Shewanella oncorhynchi: group A (bacterium strain K999) – swollen abdomens, discolorations of the skin, lens opacity and swelling of the kidneys; group B (strain K313) – slightly swollen abdomens, discolorations of the skin, lens opacity and swelling of the kidneys; group C (strain K61) – slightly swollen abdomens, lens opacity, swelling of the kidneys, skin lesions and discolorations; group K – no lesions

Fig. 2.

Cumulative mortality in fish infected with K999, K313 and K61 strains and in uninfected fish
Cumulative mortality in fish infected with K999, K313 and K61 strains and in uninfected fish

Fig. 3.

Cytotoxicity of Shewanella oncorhynchi to common carp epithelial cells: A – Percent of cytotoxicity of K999, K313 and K61 strains after 48 h incubation; B1 – Photomicrograph (×100) of carp epithelial cells uninfected with any strain of S. oncorhynchi (control groups cells); B2 – Photomicrograph (×100) of carp epithelial cells infected with K999 strain. Experiment I – initial 48-h experiment; Experiment II – first independent repeat; Experiment III – second independent repeat
Cytotoxicity of Shewanella oncorhynchi to common carp epithelial cells: A – Percent of cytotoxicity of K999, K313 and K61 strains after 48 h incubation; B1 – Photomicrograph (×100) of carp epithelial cells uninfected with any strain of S. oncorhynchi (control groups cells); B2 – Photomicrograph (×100) of carp epithelial cells infected with K999 strain. Experiment I – initial 48-h experiment; Experiment II – first independent repeat; Experiment III – second independent repeat

Potential virulence genes of the Shewanella oncorhynchi strains

FunctionGeneK61K313K999
Flagella proteinflgI flmH fleN/flhG motA fliG fliM fliP flhA cheW cheY+++
cheV +
lfgG ++
Type IV pilus proteintapC tapT tufA mshG+++
tapB +
Heat-shock proteinhtpB+++
T2 secretion systemexeF +
epsE epsG+++
T3 secretion systemvscC2 vscN2 vscR2 vscS2 vscU2 ++
Ferric-siderophore adenosinebauB +
5′-triphosphate binding cassette transporterbauD+++
Immune modulationgalE pseC rpoS lpxC kdsA+++
rfbC rffG +
ugd pseI +
wbtL ACICU cap8E+
Regulationrpe tufA csrA fur+++
Stress survivalkatA clpP sodB+++
BiofilmadeG algU luxS+++
Putative carbonic anhydrasemig-5 +
DOI: https://doi.org/10.2478/jvetres-2025-0042 | Journal eISSN: 2450-8608
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Language: English
Page range: 331 - 337
Submitted on: Jan 24, 2025
Accepted on: Aug 12, 2025
Published on: Aug 20, 2025
Published by: National Veterinary Research Institute in Pulawy
In partnership with: Paradigm Publishing Services
Publication frequency: 4 times per year
Keywords:
carp epithelial cells,
challenge tests,
cytotoxicity,
virulence genes,
whole genome sequencing
Related subjects:
Life sciences,
Molecular biology,
Microbiology and virology,
Life sciences, other,
Medicine,
Veterinary medicine

© 2025 Ewa Paździor, Agnieszka Pękala-Safińska, Arkadiusz Bomba, Dariusz Wasyl, published by National Veterinary Research Institute in Pulawy
This work is licensed under the Creative Commons Attribution 4.0 License.

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