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Asian Journal of Animal Sciences
  Year: 2021 | Volume: 15 | Issue: 1 | Page No.: 10-18
DOI: 10.3923/ajas.2021.10.18
 
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Isolation and Pathogenicity Determination of Bacillus cereus Associated with Ulcer Formation in African Catfish Clarias gariepinus
Abdelgayed M. Younes, Alkhateib Y. Gaafar , Alaa Eldeen Z. Abu-Bryka, Attia A. Abou Zaid and Ahmed A. Askora

Abstract:
Background and Objective: Bacillus cereus is a toxin-producing facultatively anaerobic Gram-positive rods and could cause diseases in aquatic animals. The main objective of this study was to determine the isolation and pathogenicity of Bacillus cereus associated with ulcer formation in African catfish Clarias gariepinus. Materials and Methods: Live moribund African catfish Clarias gariepinus suffered from skin ulceration and hemorrhages were collected from a private fish farm at Kafr El Sheikh Governorate north Egypt, March, 2019. The bacterium isolated from moribund fishes was identified as a Bacillus cereus based on phenotypic, biochemical characteristics and confirmed with 16s rRNA sequence. Results: Experimentally infected fish showed external and internal clinical symptoms typical to those caused by natural infection. The clinical signs of the affected fish showed ulcers on the skin. The severity of ulcers was dose dependent. Antibiotic sensitivity tests showed that the bacterium was sensitive to all antibiotics but cefotaxime. B. cereus isolate was found to be positive for the production of protease, lipase, lecithinase and hemolysin. Conclusion: This study indicated that B. cereus was the causative agent responsible for skin ulceration and disease in African catfish C. gariepinus.
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How to cite this article:

Abdelgayed M. Younes, Alkhateib Y. Gaafar, Alaa Eldeen Z. Abu-Bryka, Attia A. Abou Zaid and Ahmed A. Askora, 2021. Isolation and Pathogenicity Determination of Bacillus cereus Associated with Ulcer Formation in African Catfish Clarias gariepinus. Asian Journal of Animal Sciences, 15: 10-18.

DOI: 10.3923/ajas.2021.10.18

URL: https://scialert.net/abstract/?doi=ajas.2021.10.18

 
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