E-ISSN 2218-6050 | ISSN 2226-4485
 

Research Article


Summer mortality syndrome bacterial pathogens in farmed Nile tilapia (Oreochromis niloticus)

Fawzy I. Magouz, Eman M. Moustafa, Etab M. Abo-Remela, Marwa R. Halawa, Passant M. Barakaat, Amira A. Omar.


Abstract
Background:
The high summer mortality in many fish farms, which had detrimental economic and social implications, was a serious challenge that the fish industry had to deal with.
Aim:
With an examination of the most effective antibiotic, the ongoing research was intended to shed light on the identification of the main bacterial pathogens associated with the summer mortality syndrome in the diseased farmed Nile tilapia.
Methods:
Six hundred dead Nile tilapia samples that had suffered from summer mortality were collected from several fish farms between May and October of 2022. The gathered fish displayed hemorrhagic areas on the skin, scale detachment, fin degeneration, erosions, skin ulcers, and corneal opacity with unilateral and/or bilateral exophthalmia. The most prominent internal appearance was swelling of the internal organs with sanguineous ascetic fluid.
Results:
There were 225 bacterial isolates found. Six species were identified through phenotypic and biochemical analysis; they were Aeromonas, Vibrio, Streptococcus, Pseudomonas, Enterococcus, and Edwardsiella spp., in descending percentage, respectively. Aeromonas spp., Vibrio spp., and Streptococcus spp. were the three most frequent isolated bacterial pathogens. The identification of Aeromonas hydrophila, Vibrio spp., and Streptococcus iniae, the three most common bacterial isolates, was confirmed by molecular analysis by PCR. Most of the tested strains were found to be responsive to Ciprofloxacin, Gentamicin, and Chloramphenicol but resistant to Amoxicillin, according to an antibiotic sensitivity test.
Conclusion:
The three most dangerous common bacterial infections discovered during mass-farmed tilapia summer mortality are A. hydrophila, Vibrio sp., and S. iniae. This makes it clear that high water temperatures may raise the possibility of bacterial infections, which could cause widespread tilapia mortality and substantial financial losses. Therefore, it is crucial to maintain a beneficial fish culture, environment, and husbandry practices to enhance the tilapia-rearing environment and lessen the virulence of the disease. Isolated bacterial strains showed low levels of resistance to Amoxicillin but were vulnerable to Ciprofloxacin, Gentamicin, and Chloramphenicol.

Key words: Aeromonas hydrophila, Nile tilapia, Streptococcus iniae, Summer mortality, Vibrio sp.


 
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How to Cite this Article
Pubmed Style

Magouz FI, Moustafa EM, Abo-Remela EM, Halawa MR, Barakaat PM, Omar AA. Summer mortality syndrome bacterial pathogens in farmed Nile tilapia (Oreochromis niloticus). Open Vet J. 2024; 14((1) (Zagazig Veterinary Conference)): 53-69 . doi:10.5455/OVJ.2024.v14.i1.7


Web Style

Magouz FI, Moustafa EM, Abo-Remela EM, Halawa MR, Barakaat PM, Omar AA. Summer mortality syndrome bacterial pathogens in farmed Nile tilapia (Oreochromis niloticus). https://www.openveterinaryjournal.com/?mno=174702 [Access: June 21, 2024]. doi:10.5455/OVJ.2024.v14.i1.7


AMA (American Medical Association) Style

Magouz FI, Moustafa EM, Abo-Remela EM, Halawa MR, Barakaat PM, Omar AA. Summer mortality syndrome bacterial pathogens in farmed Nile tilapia (Oreochromis niloticus). Open Vet J. 2024; 14((1) (Zagazig Veterinary Conference)): 53-69 . doi:10.5455/OVJ.2024.v14.i1.7



Vancouver/ICMJE Style

Magouz FI, Moustafa EM, Abo-Remela EM, Halawa MR, Barakaat PM, Omar AA. Summer mortality syndrome bacterial pathogens in farmed Nile tilapia (Oreochromis niloticus). Open Vet J. (2024), [cited June 21, 2024]; 14((1) (Zagazig Veterinary Conference)): 53-69 . doi:10.5455/OVJ.2024.v14.i1.7



Harvard Style

Magouz, F. I., Moustafa, . E. M., Abo-Remela, . E. M., Halawa, . M. R., Barakaat, . P. M. & Omar, . A. A. (2024) Summer mortality syndrome bacterial pathogens in farmed Nile tilapia (Oreochromis niloticus). Open Vet J, 14 ((1) (Zagazig Veterinary Conference)), 53-69 . doi:10.5455/OVJ.2024.v14.i1.7



Turabian Style

Magouz, Fawzy I., Eman M. Moustafa, Etab M. Abo-Remela, Marwa R. Halawa, Passant M. Barakaat, and Amira A. Omar. 2024. Summer mortality syndrome bacterial pathogens in farmed Nile tilapia (Oreochromis niloticus). Open Veterinary Journal, 14 ((1) (Zagazig Veterinary Conference)), 53-69 . doi:10.5455/OVJ.2024.v14.i1.7



Chicago Style

Magouz, Fawzy I., Eman M. Moustafa, Etab M. Abo-Remela, Marwa R. Halawa, Passant M. Barakaat, and Amira A. Omar. "Summer mortality syndrome bacterial pathogens in farmed Nile tilapia (Oreochromis niloticus)." Open Veterinary Journal 14 (2024), 53-69 . doi:10.5455/OVJ.2024.v14.i1.7



MLA (The Modern Language Association) Style

Magouz, Fawzy I., Eman M. Moustafa, Etab M. Abo-Remela, Marwa R. Halawa, Passant M. Barakaat, and Amira A. Omar. "Summer mortality syndrome bacterial pathogens in farmed Nile tilapia (Oreochromis niloticus)." Open Veterinary Journal 14.(1) (Zagazig Veterinary Conference) (2024), 53-69 . Print. doi:10.5455/OVJ.2024.v14.i1.7



APA (American Psychological Association) Style

Magouz, F. I., Moustafa, . E. M., Abo-Remela, . E. M., Halawa, . M. R., Barakaat, . P. M. & Omar, . A. A. (2024) Summer mortality syndrome bacterial pathogens in farmed Nile tilapia (Oreochromis niloticus). Open Veterinary Journal, 14 ((1) (Zagazig Veterinary Conference)), 53-69 . doi:10.5455/OVJ.2024.v14.i1.7