Author(s): Ihab K Mohamed, Suzan E Ali and Nahed M Ismail

Abstract: The present study was aimed to investigate the impact of lining of the watercourses on histology and function of the gills of the tilapia fish. The investigated sites were divided according to the degree of the pollution into two study areas. The first study area was less polluted than the second one. Both areas were divided into two sites according the existence and the kind of the lining that they have. The study area 1 has site I: El-Bostan canal lined with cement and site II: unlined Nasser canal that has a sandy soil, sites I and II are in El-Beharia governorate. The study area 2 has site III: River Nile lined with rocks, in Giza governorate and site IV: unlined Ismailia Canal with a muddy soil, in Al-Qaluobia governorate. The microscopical examination showed presence of marked histopathological alterations of the gills of fish collected from the lined and the unlined sites. The severity of these changes ranged from mild ‒ as in the samples of the lined sites ‒ to severe in those of the unlined sites. These findings included atrophy and curling in the gill lamellae, interstitial odema, necrosis of the epithelial lining, rupture of the pillar cells and capillaries, telangiectasis and aneurism. The biochemical results revealed an increase of the values of urea and creatinine in the serum of the fish collected from the unlined, highly polluted study area. These biochemical changes may be attributed to the gill dysfunction that is due to the recorded histopathological alterations.

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