Histopathological changes in liver and gill epithelium of Nile tilapia, Oreochromis niloticus, exposed to waterborne copper

Pesquisa Veterinaria Brasileira - Tập 27 Số 3 - Trang 103-109 - 2007
António Figueiredo-Fernandes1, J. Ferreira‐Cardoso1, Sofia Garcia-Santos1, Sandra M. Monteiro1, João Soares Carrola1, Pedro Matos1, A. Fontaínhas‐Fernandes1
1Universidade de Trás-os-Montes e Alto Douro, Portugal

Tóm tắt

Nile tilapia, Oreochromis niloticus, of both sexes were reared in freshwater and exposed to 0.5, 1.0 and 2.5mg L-1 of waterborne copper for a period of 21 days. Liver and gill samples were collected after 21 days of exposure to copper and lesions were analyzed by light microscopy. The main histopathological changes observed in gills exposed to the highest concentration were edema, lifting of lamellar epithelia and an intense vasodilatation of the lamellar vascular axis. Although less frequent, lamellar fusion caused by the filamentar epithelium proliferation and some lamellar aneurisms were also found. The liver of control group exhibited a quite normal architecture, while the fish exposed to copper showed vacuolation and necrosis. These hepatic alterations were more evident in fish exposed to 1.0 and 2.5mg L-1 copper concentrations. The number of hepatocytes nucleus per mm² of hepatic tissue decreased with the increase of copper concentration. In contrast, the hepatic somatic index was high in fish exposed at 2.5mg L-1 of copper. In short, this work advance new knowledge as influence of copper in the gill and liver histology of O. niloticus and demonstrated that their effects could be observed at different concentrations.

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Pesquisa Veterinaria Brasileira

Tập 27 Số 3

103-109

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