Análise das respostas citogenotóxicas e histopatológicas do peixe Trematomus newnesi exposto à água do mar diante da Estação Antártica Brasileira "Comandante Ferraz", Ilha Rei George, Antártica / Analysis of cytogenotoxic and histopathologic responses of the fish Trematomus newnesi exposed to seawater in front of the Brazilian Antarctic Research Station "Comandandante Ferraz", King George Island, Antarctica.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Many countries have installed research stations in Antarctica. Petroleum hydrocarbons and the sewage disposed into the sea by the stations are potential sources of pollution in Antarctica. Trematomus newnesi specimens were used to assess genotoxic potential and histopathology of the liver and gills of the water surrounding the Brazilian Antarctic Station ?Comandante Ferraz?. Fish were exposed to seawater at the sewage outfall and in front of the fuel tanks, in both in situ and laboratory assays. The Mn and ENA assay showed that the frequency of R was, in general, lower in the control groups than in the exposed ones in both in situ and laboratory assays, however there were no statistically significative differences in any of the experiments. The most frequent branchial lesions observed in the exposed groups were epithelium hipertrophy and lamelar telangiectasis. In the liver, predominant microscopic findings included lipid vacuolization and macrophages, specially in fish from the in situ experiments. Exposed groups did not show significative differences in the histopathological indexes from those of the controls in any of the experiments. Nevertheless, our results suggest that of the places studied the sewage outlet may present a greater potential of risk to T. newnesi nearby the Brazilian Station.

ASSUNTO(S)

micronucleus estação antártica brasileira ?comandante ferraz? trematomus newnesi histopatologia. histopathology. micronúcleo brazilian antarctic research station trematomus newnesi

ACESSO AO ARTIGO

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