Prevalence and Antibiotic Susceptibility of Bacterial Pathogens Implicating the Mortality of Cultured Nile Tilapia, Oreochromis niloticus
Hassan, S., Abdel-Rahman, M., Mansour, E., Monir, W. (2020). Prevalence and Antibiotic Susceptibility of Bacterial Pathogens Implicating the Mortality of Cultured Nile Tilapia, Oreochromis niloticus. EKB Journal Management System, 10(1), 23-43. doi: 10.21608/eja.2020.25437.1017
Saad Hassan; Mohamed Abdel-Rahman; El Sayed Mansour; Walid Monir. "Prevalence and Antibiotic Susceptibility of Bacterial Pathogens Implicating the Mortality of Cultured Nile Tilapia, Oreochromis niloticus". EKB Journal Management System, 10, 1, 2020, 23-43. doi: 10.21608/eja.2020.25437.1017
Hassan, S., Abdel-Rahman, M., Mansour, E., Monir, W. (2020). 'Prevalence and Antibiotic Susceptibility of Bacterial Pathogens Implicating the Mortality of Cultured Nile Tilapia, Oreochromis niloticus', EKB Journal Management System, 10(1), pp. 23-43. doi: 10.21608/eja.2020.25437.1017
Hassan, S., Abdel-Rahman, M., Mansour, E., Monir, W. Prevalence and Antibiotic Susceptibility of Bacterial Pathogens Implicating the Mortality of Cultured Nile Tilapia, Oreochromis niloticus. EKB Journal Management System, 2020; 10(1): 23-43. doi: 10.21608/eja.2020.25437.1017

Prevalence and Antibiotic Susceptibility of Bacterial Pathogens Implicating the Mortality of Cultured Nile Tilapia, Oreochromis niloticus

Egyptian Journal for Aquaculture
Article 2, Volume 10, Issue 1, March 2020, Page 23-43  XML PDF (570.07 K)
Document Type: Original Article
DOI: 10.21608/eja.2020.25437.1017
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Authors
Saad Hassan1; Mohamed Abdel-Rahman email 2; El Sayed Mansour3; Walid Monir4
1Botany and microbiology department, faculty of science , Al-Azhar University
2Faculty of science, Al-Azhar University
3Bacteriology Department, Animal Health Research Institute, Zagazig Branch, Egypt
4Botany and Microbiology Faculty of Science, Al-Azhar University, Cairo, Egypt
Abstract
Nile-Tilapia (Oreochromis niloticus) aquaculture represents one of the most important cultivation species in Egypt. However, Tilapia fish farming is challenged by some problems. Of those, the presence of bacterial pathogens resulting in high fish mortalities and huge economic losses. Thus, the current investigation aimed to isolate, identify, and characterize the pathogenic bacteria from Nile tilapia fish farm in El-Abassa village, Egypt and to investigate their antibiotic susceptibility as a primary step for controlling diseases. 182 bacterial isolates were obtained from one hundred Tilapia fish samples. The microbiological and biochemical analysis of the examined fish indicated the presence of only 5 bacterial genera. Three of them are Gram-negative bacteria (representing 86.26% of total isolates) including Aeromonas spp. (46.70 %), Pseudomonas spp. (23.08 %), and Vibrio spp. (16.48 %). While two genera are Gram-positive bacteria (representing 13.74% of the total isolates) including Streptococcus spp. (8.79 %) and Staphylococcus spp. (4.95 %). This indicates that Gram-negative bacteria are the main cause of high fish mortalities in the studied area while Aeromonas hydrophila exhibited the highest prevalence in infected tilapia. Antibiogram test revealed high levels of resistance expressed by all isolates to ampicillin, amoxicillin, and erythromycin. On the other hand, norfloxacin was effective against all isolated bacteria followed by ciprofloxacin; therefore, norfloxacin should be recommended as a supplement in fish fed-diets to control the bacterial infection. Establishing effective control methods for pathogenic isolates would greatly enhance fish production.
Keywords
Fish mortality; Nile tilapia; Oreochromus niloticus, pathogenic bacteria; sensitivity test; Aeromonas spp
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