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International Journal of Fisheries and Aquatic Studies
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(ICV-Poland) Impact Value: 76.37, Impact Factor: RJIF 5.69
E-ISSN: 2347-5129, P-ISSN: 2394-0506

International Journal of Fisheries and Aquatic Studies

2020, Vol. 8, Issue 3, Part F

Investigation of Streptococcal micro-organism as a cause of mortality syndrome in cultured Nile tilapia


Author(s): Adel M El-Gamal and El-Gohary MS

Abstract: The objective of this study was the isolation and identification of Streptococcus spp. as one of the mortality syndrome causes in tilapia fish farms. One hundred apparently healthy and diseased cultured Oreochromis niloticus fish and 20 water samples (10 samples from the water inlet and 10 samples from farms water) were collected randomly from some private fish farms at Kafr El sheikh. Bacteriological examination revealed the isolation of Streptococcus spp. either from water or diseased fish then the isolates were identified microscopically, biochemically and finally confirmed by PCR. A total of 7 Streptococcus spp. isolates; 5 S. agalactiae isolates (3 from fish and 2 from water) and 2 isolates of Streptococcus iniae (1 from fish and 1 from water) were isolated from the examined samples. S. agalactiae isolates from fish were examined for the presence of virulence gene Scp B, results showed that all examined samples have this gene. Experimental infection was carried out using isolated Streptococcus spp. and treatment trial was done using Florfenicol according to the result of the sensitivity test.

Pages: 461-465  |  69 Views  2 Downloads

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How to cite this article:
Adel M El-Gamal, El-Gohary MS. Investigation of Streptococcal micro-organism as a cause of mortality syndrome in cultured Nile tilapia. Int J Fish Aquat Stud 2020;8(3):461-465.
International Journal of Fisheries and Aquatic Studies