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164591

Survey on the most common bacterial pathogens of the Nile tilapia fries in Kafr El sheikh governorate, Egypt

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Last updated: 01 Jan 2025

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Abstract

Recently, aquaculture in Egypt has faced multiple records of mass mortality resulting in high economic losses. The mass mortality among tilapia fries is mostly attributed to bacterial pathogens either with or without other pathogens. This study is designed to investigate the etiological factors implicated in the mortality of the Nile tilapia fries. Bacteriological examination of the Nile tilapia fries including isolation and identification using a range of techniques (API NE20, Vitec, PCR and 16SrRNA Sequencing) revealed an array of typical pathogens known to cause lethal infections in tilapia. The most frequently isolated strains were Aeromonads 33.3% (A. veronii, A. sobria, A. hydrophila), Staphylococcus epidermidis, 11.1 % Pseudomonas aeruginosa, 11.1%   and Shigella sonnei 11.1%. Furthermore, three emerging freshwater aquaculture pathogens have zoonotic significance, namely Providencia rettgeri (11.1%), Shewanella putrefaciens (11.1%), and Acinetobacter lwoffii (11.1%) were isolated from fish fries. Despite known pathogenicity, inoculation of fish fingerlings with the different bacterial isolates resulted in only mild mortality rates under non-stress conditions, emphasizing the role of additional environmental stressors in triggering mass mortality of juvenile fish.  Conclusively, these pathogens have a significant negative impact on tilapia fries, particularly in combination with environmental stress.

DOI

10.21608/ejabf.2021.164591

Keywords

tilapia fries, Aeromonads, S. epidermidis, Shigella sonnei, Providencia rettgeri, Acinetobacter lwoffii

Authors

First Name

Ahmed

Last Name

Arafa et al.

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Volume

25

Article Issue

2

Related Issue

22958

Issue Date

2021-03-01

Receive Date

2021-04-17

Publish Date

2021-03-01

Page Start

385

Page End

402

Print ISSN

1110-6131

Online ISSN

2536-9814

Article File

EJABF_Volume 25_Issue 2_Pages 385-402.pdf

PDF . 1.1MB

Link

https://ejabf.journals.ekb.eg/article_164591.html

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https://ejabf.journals.ekb.eg/service?article_code=164591

Order

19

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Original Article

Type Code

103

Publication Type

Journal

Publication Title

Egyptian Journal of Aquatic Biology and Fisheries

Publication Link

https://ejabf.journals.ekb.eg/

MainTitle

Survey on the most common bacterial pathogens of the Nile tilapia fries in Kafr El sheikh governorate, Egypt

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Article

Created At

22 Jan 2023