International Journal of Biology Research

Authors
Komolafe Olusola Olaniyi, Obayemi Oluwadamilare Emmanuel, Lawson Oluwatobi

Abstract
Histopathological changes in the organs of Tilapia zillii in Opa and Igun reservoir were examined. Fishes were collected using cast nets and traps while the gills, liver and fillet were excised out for histological examination. The result showed the rupture of gill epithelium, hyperplasia and degeneration of secondary lamellae of the gills in fish samples collected from Igun reservoir when compared to Opa reservoir. The fillet of the fish in the two reservoirs showed muscular atrophy while muscular degeneration was observed in the fillet of Igun reservoir fish. Histological examination of liver of T. zillii in Igun revealed necrosis, nuclear hypertrophy, hepatocytes hypertrophy and hepatopancreas degeneration. Degeneration of the liver cells was observed in T. zillii in Opa reservoir.