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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: Ewa Paździor,  Agnieszka Pękala-Safińska,  Arkadiusz Bomba and  Dariusz Wasyl  
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

Fig. 2.

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

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 issues 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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