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Identification and characterisation of emerging fish pathogens Aeromonas veronii and Aeromonas hydrophila isolated from naturally infected Channa punctata
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Identification and characterisation of emerging fish pathogens Aeromonas veronii and Aeromonas hydrophila isolated from naturally infected Channa punctata
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Identification and characterisation of emerging fish pathogens Aeromonas veronii and Aeromonas hydrophila isolated from naturally infected Channa punctata
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Journal Article
Identification and characterisation of emerging fish pathogens Aeromonas veronii and Aeromonas hydrophila isolated from naturally infected Channa punctata
2024
Overview
Naturally infected
Channa punctata
exhibiting bacterial septicemic syndrome including ulcerations along with mortality records were collected from a fish farm in Assam during winter season (early November 2020 to early January 2021). The moribund fishes were subjected for bacterial isolation followed by identification of the bacteria. Two dominant emerging bacterial pathogens were identified as
Aeromonas veronii
(isolate ZooGURD-01) and
Aeromonas hydrophila
(isolate ZooGURD-05) by standard biochemical characterization and 16S rRNA and
rpo B
gene amplification. Re-infection experiments of both the bacterial isolates in healthy disease-free
C. punctata
showed similar symptoms to that of natural infection thus confirming their virulence. The LD
50
calculated during challenge test for both the isolates ZooGURD-01 and ZooGURD-05 found to be pathogenic at 2.6 × 10
4
and 1.6 × 10
4
CFU/fish respectively. Further PCR amplification of specific virulent genes (aerolysin, hemolysin and enterotoxin) confirmed pathogenicity for both isolates. Histopathological examinations of liver and kidney in re-infection experiments showed prominent changes supporting bacterial septicaemia. Antibiotic sensitivity pattern showed that the isolates ZooGURD-01 and ZooGURD-05 were sensitive to 22 and 19 out of 25 antimicrobials respectively. The present study was the first report on the mortality of farmed
C. punctata
associated with natural infection caused by
A. veronii
and
A. hydrophila
with no record of pathogenicity of
A. veronii
in
C. punctata
.
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