5619
Noha Mohamed Mohamed Sabry
Control Of Pathogenic
Bacteria In Different
Types Of Water Using
Nanoparticles
Water quality, Fish, Nanoparticles, Bacterial Pathogens, Lake,
Antibiotics discs
Water quality plays a vital role in the productivity of lake‘s fish. Qaroun and El- Manzala lakes are exposed to untreated agricultural, domestic and industrial effluents which are considered serious pollutants. This study was conducted to monitor the water quality of both lakes and the pathogenic bacteria in the surface water and fish. Physicochemical parameters and bacterial count of water and two types of fish Tilapia zillii and Mugil cephalus were studied. Water samples of Qaroun lake were collected from four sites at certain distances from El-Batts drain in the lake during 2015-2016. While water samples of El- Manzala lake were collected from four sites at certain distances from Bahr El Baqr drain in the lake. Physical characteristics of the water in Qaroun lake showed that the water temperature varied between 16 and 30oC, pH was alkaline. Water salinity and dissolved oxygen decreased near El-Batts drain, while the chemical oxygen demand, amonia and nitrate levels were high due to the pollution and bacterial activity. Bacteriological characterization revealed that the bacterialload in the nearest point to El-Batts drain was higher than the other sites. The total and fecal coliform near El-Batts drain exceeded the Egyptian standard limits; it reached 6.4x107 in summer. On the other hand, physical characteristics of the water in El- Manzala lake showed that the water temperature varied between 16 and 30oC, pH was alkaline. Water salinity and dissolved oxygen decreased near Bahr El Baqr drain, while the chemical oxygen demand, ammonia and nitrate levels were high due to the pollution and bacterial activity. Bacteriological characterization revealed that the bacterial load in the nearest point to Bahr El Baqr drain was higher than the other examined sites of lake water. The total and fecal coliform near Bahr El Baqr drain exceeded the Egyptian standard limits; it reached 7.5x107 insummer. The study revealed that the bacterial pathogens counts in fish were high in mullet species than that of tilapia. Total and fecal coliforms were detected in muscles once during the study period; in spring for tilapia and in summer for mullet fish. The study revealed that Aeromonas hydrophila was the most prevalant pathogen isolated from Tilapia zillii and Mugil cephalus. The study highlights the hazardous effect of the untreated domestic and industrial drainage wastes on water quality and fish of both Qaroun and El- Manzala lakes.
2019
Ph.d
Ain Shams
Science