Identification and characterization of Aeromonas caviae isolated from infected gift tilapia (Oreochromis mossambicus) nursery

Authors

  • Vijayan SARANYA Aquatic Animal Health Laboratory, Centre for Marine Science and Technology (CMST), Manonmaniam Sundaranar University, Rajakkamangalam, 629 502, Tamilnadu, India
  • Eswaramoorthy THIRUMALAIKUMAR Centre for Aquaculture, Col.Dr. Jeppiaar Research Park, Sathyabama Institute of Science and Technology, Chennai, Tamilnadu, India https://orcid.org/0000-0002-2990-4164
  • Ganapathi UMA Aquatic Animal Health Laboratory, Centre for Marine Science and Technology (CMST), Manonmaniam Sundaranar University, Rajakkamangalam, 629 502, Tamilnadu, India https://orcid.org/0000-0002-5088-5666
  • John Radha ANUSHA Aquatic Animal Health Laboratory, Centre for Marine Science and Technology (CMST), Manonmaniam Sundaranar University, Rajakkamangalam, 629 502, Tamilnadu, India https://orcid.org/0000-0003-4335-9649
  • Thavasimuthu CITARASU Aquatic Animal Health Laboratory, Centre for Marine Science and Technology (CMST), Manonmaniam Sundaranar University, Rajakkamangalam, 629 502, Tamilnadu, India https://orcid.org/0000-0001-6166-620X

DOI:

https://doi.org/10.5281/zenodo.18754877

Keywords:

Aeromonas caviae, Aquaculture, Fish Disease, Oreochromis mossambicus, Virulence Factors

Abstract

Aeromonas caviae CMST AAHL was isolated and identified from the infected Tilapia moribund samples. Dominant bacterial microbiota was isolated from infected fishes and challenged with healthy GIFT Tilapia fishes and monitored the survival. Among the different strains challenged, GT3, GT4 and GT5 had influenced to lower survival and higher virulence factors such as proteolytic, haemolytic, gelatinase and cellulose activity. The three virulent strains are also able to produce biofilm. Histopathaological studies also revealed that, the affected tissue parts had found inflammation and necrosis. Antibiotic sensitivity tests confirmed that, GT3, GT4 and GT5 were susceptible for gentamycin, tetracycline and chloramphenicol. Based on the strong virulence and pathetic effect of the GT3 strain, the strain was genomically identified by 16S rRNA sequencing and confirmed as A. caviae and deposited the GenBank and the accession number is OQ804404.1.

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Published

2026-02-27

How to Cite

SARANYA, V., THIRUMALAIKUMAR , E. ., UMA, G. ., ANUSHA, J. R. ., & CITARASU, T. (2026). Identification and characterization of Aeromonas caviae isolated from infected gift tilapia (Oreochromis mossambicus) nursery. AQUATIC ANIMAL REPORTS (AQAR), 4(1), 37–52. https://doi.org/10.5281/zenodo.18754877

Issue

Vol. 4 No. 1 (2026): Aquatic Animal Reports

Section

Research Article

License

Copyright (c) 2026 Vijayan SARANYA, Eswaramoorthy THIRUMALAIKUMAR , Ganapathi UMA, John Radha ANUSHA, Thavasimuthu CITARASU

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.