Histopathological Changes in the Gills, Fillet and Liver of Parachanna obscura in an Abandoned Gold Mine Reservoir of Igun and Opa Reservoir, Nigeria
This study examined comparative histopathological changes in the gills, fillet and liver of Parachanna obscura of Opa and Igun reservoirs. Fish species were collected with the reservoir water and brought to the laboratory for identification. Histological analyses were done on the fish tissues and photomicrograph taken. Similar alterations observed in the gills of P. obscura in Opa and Igun reservoirs include rupture of epithelium, hypertrophy of primary lamellae, hyperplasia of secondary lamellae and fusion of lamellae. The fillet of P. obscura in the two reservoirs revealed muscular atrophy and splitting while muscular atrophy and degeneration were observed in the fillet of P. obscura of Igun reservoir only. Histopathological alterations observed in the liver of P. obscura of Opa reservoir liver was vascular congestion in portal artery compared to vascular congestion in central vein of Igun reservoir fish. Both reservoirs fish showed hepatopancreas and liver cells degeneration. The study concluded that histopathological alterations were more prominent in the organs of P. obscura in Igun reservoir compared to Opa reservoir.
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