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Articles by Mamdouh Yousif Elgendy
Total Records ( 2 ) for Mamdouh Yousif Elgendy
  Mamdouh Yousif Elgendy , Azza Morsi Hassan , Mostafa Fawzy Abdel Zaher , Hossam Hassan Abbas , Waleed Salah El-Din Soliman and Elsayed Mahmoud Bayoumy
  Background and Objective: Cymothoid isopods are extremely serious fish parasitic infestations that adversely impact the health of aquatic animals with considerable economic losses. The present study aimed to investigate the massive infestation by the cymothoid isopod, Nerocila bivittata (N. bivittata ) affecting Tilapia zillii (T. zillii ) fish within Lake Qarun Egypt as an attempt to understand the effects of the parasites on the haematological parameters and histopathological alterations in the infested fish. Materials and Methods: A total of 150 T. zillii were collected alive during June, 2016. Fish were thoroughly investigated visually and microscopically for presence of external parasites. Analysis of blood and serum samples from parasitized and un-parasitized fish was carried out. Results: Ninety-six fish (64%) were found to be infected with isopods. All retrieved isopods were further identified as N. bivittata. The isopod was found settled in different parts of fish body but gills were the most predilection site. Parasitized fish had lowered erythrocyte counts, haemoglobin and haematocrit values. Leucocyte counts, total protein, albumen and globulin also decreased in infested fish. Severe histopathological alterations were recorded in the skin, muscles and gills of infested fish. Analysis of water samples collected from the Lake revealed unfavorable values for water quality measures and levels of some heavy metals were higher than the recommended values. Conclusion: The results of this study indicate that N. bivittata are serious parasites in aquaculture and can infect wild fish populations. These parasites feed on the blood of infest fish and put their lives at risk.
  Mamdouh Yousif Elgendy , Iman Kamel Abumourad , Shimaa Elsayed Mohamed Ali , Waleed Salah El-Din Soliman , Taghreed Borhan El-Din Ibrahim and Wafaa Tawfik Abbas
  Background and Objective: Fish health and aquatic environment are strongly interrelated. Aquatic environment receive array of anthropogenically derived chemicals with deleterious health effects on the cohabitant aquatic animals and threatens their lives. The aim of this study was to evaluate the health status of Tilapia zillii and Solea vulgaris captured from Lake Qarun, Egypt known to receive lofty loads of contaminants as well as to monitor the genotoxic effects of some heavy metals detected in lake water on the two fish species. Methodology: Heavy metals (Cu, Zn, Cd, Ni and Pb) were assessed in water and fish specimens (Tilapia zillii and Solea vulgaris) collected from Lake Qarun and the mean value was recorded. Fish and water samples were subjected to microbiological and parasitological examination. Additionally, genotoxicity was analysed using comet assay. Results: Heavy metals; Zn, Ni and Cu showed high values in water exceeding the recommended limits. Accumulation of heavy metals was noticed in fish muscles and Ni was the uppermost detected metal. Genotoxicity was confirmed in fish liver cells by comet assay. The DNA damage was quantified as; tail length, DNA percentage in tail, tail moment and number of cells with tail. Genotoxicity was severe in Solea vulgaris than Tilapia zillii. Bacterial infections; Vibrio alginolyticus (21 isolate), Aeromonas hydrophila (13), Photobacterium damselae subsp. piscicida (7) were detected in fish specimens. Parasitic Isopoda sp. were found attached to the ventral body surface and inside the gill chamber of fish. Conclusion: The results of this study indicate that Lake Qarun is contaminated with substances that are genotoxic to fish as well as predispose fish to numerous opportunistic pathogens.
 
 
 
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