Phenotypic Characterization of Certain Flavobacteria Species Infected Cultured Freshwater Fish

Samy A. Khalil; Amr Fadel; EmadAl-Ebshahy; Nada H.A. Menesy

doi:10.5455/ajvs.160357

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Original Article

AJVS. 2023; 79(1): 44-50

doi: 10.5455/ajvs.160357

Phenotypic Characterization of Certain Flavobacteria Species Infected Cultured Freshwater Fish

Samy A. Khalil, Amr Fadel, Emadal-ebshahy, Nada H.a. Menesy.

Abstract
One of the most important and distributed bacterial disease in freshwater fish in Egypt is flavobacteriosis disease that caused by the gram-negative bacillus Flavobacterium which infects fish under stressful conditions and causing high mortality. In this study we have attempted to identify the possible infection of three flavobacteria app. (F. columnare, F. covae, and F. davissi) out of 200 cultured African catfish Clarias gariepinus and Nile tilapia tilapia niloticus. The Goal of this study was to isolate and characterize Flavobacteria species phenotypically, biochemically and detect the haemolytic virulence activity, beside evaluation antibiotics resistance activity of this bacterium. Despite, all flavobacteria species cause heamolysis to sheep blood agar that indicate to presence of heamolysine virulence gene but the F.columnare TIL2015 strain show no heamolysis on sheep blood agar. According to antibiotic sensitivity assay Gentamycin 30 μg, was the most effective antibiotic against the all tested Flavobacteria species, however F.columnare strains were sensitive against Doxycycline 30 μg, streptomycin 10 μg, beside gentamycin 30 μg. All isolates were resistant to amoxicillin 30 μg and Cefalexine 30 μg.

Key words: Keywords: Flavobacterium spp, hemolytic activitiy, antibiotic senstivity, and fish

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Pubmed Style

Khalil SA, Fadel A, Emadal-ebshahy , Menesy NH. Phenotypic Characterization of Certain Flavobacteria Species Infected Cultured Freshwater Fish. AJVS. 2023; 79(1): 44-50. doi:10.5455/ajvs.160357

Web Style

Khalil SA, Fadel A, Emadal-ebshahy , Menesy NH. Phenotypic Characterization of Certain Flavobacteria Species Infected Cultured Freshwater Fish. https://www.alexjvs.com/?mno=160357 [Access: May 05, 2025]. doi:10.5455/ajvs.160357

AMA (American Medical Association) Style

Khalil SA, Fadel A, Emadal-ebshahy , Menesy NH. Phenotypic Characterization of Certain Flavobacteria Species Infected Cultured Freshwater Fish. AJVS. 2023; 79(1): 44-50. doi:10.5455/ajvs.160357

Vancouver/ICMJE Style

Khalil SA, Fadel A, Emadal-ebshahy , Menesy NH. Phenotypic Characterization of Certain Flavobacteria Species Infected Cultured Freshwater Fish. AJVS. (2023), [cited May 05, 2025]; 79(1): 44-50. doi:10.5455/ajvs.160357

Harvard Style

Khalil, S. A., Fadel, . A., Emadal-ebshahy, . & Menesy, . N. H. (2023) Phenotypic Characterization of Certain Flavobacteria Species Infected Cultured Freshwater Fish. AJVS, 79 (1), 44-50. doi:10.5455/ajvs.160357

Turabian Style

Khalil, Samy A., Amr Fadel, Emadal-ebshahy, and Nada H.a. Menesy. 2023. Phenotypic Characterization of Certain Flavobacteria Species Infected Cultured Freshwater Fish. Alexandria Journal of Veterinary Sciences, 79 (1), 44-50. doi:10.5455/ajvs.160357

Chicago Style

Khalil, Samy A., Amr Fadel, Emadal-ebshahy, and Nada H.a. Menesy. "Phenotypic Characterization of Certain Flavobacteria Species Infected Cultured Freshwater Fish." Alexandria Journal of Veterinary Sciences 79 (2023), 44-50. doi:10.5455/ajvs.160357

MLA (The Modern Language Association) Style

APA (American Psychological Association) Style

Khalil, S. A., Fadel, . A., Emadal-ebshahy, . & Menesy, . N. H. (2023) Phenotypic Characterization of Certain Flavobacteria Species Infected Cultured Freshwater Fish. Alexandria Journal of Veterinary Sciences, 79 (1), 44-50. doi:10.5455/ajvs.160357

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