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¹ Cross River University of Technology, Department of Fisheries, PMB 102, Obubra. Cross River State, Nigeria
² Federal University of Technology, Department of Fisheries and Wildlife, PMB 704 Akure, Ondo State, Nigeria DOI : 10.4194/trjfas.2011.0106 Viewed : 4634 - Downloaded : 6281 This research determined the pathological effects of Moringa oleifera seed powder, a natural alternative to alum, used as a water purifier in fish culture enclosure in Nigeria. The histological changes in gill, liver, skin and kidney of fingerling and adult Nile tilapia Oreochromis niloticus exposed to aqueous extract of Moringa oleifera seed at different sub-lethal concentration under static bioassay procedure are described. There were pathologic lesions observed which included different levels of cells degeneration in the gill, lamellar hyperemia; hypertrophy of gill arch occurred, while hyperplasia, disarrangement of hepatic cell, necrosis, and vacuolation occurred in fish liver and kidney. Damages of different organs became severe with increasing concentration of aqueous extract of M. oleifera seeds and time of exposure. Keywords : Histology, Moringa oleifera, Nile tilapia, water quality