1. Estrogenic effects in crucian carp (Carassius carassius) exposed to treated sewage effluent.
- Author
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Diniz, M.S., Peres, I., Magalhães-Antoine, I., Falla, J., and Pihan, J.C.
- Subjects
SEWAGE purification ,DRINKING water ,FISHES ,SEWAGE disposal - Abstract
Abstract: To assess the estrogenicity of a municipal sewage treatment plant, sexually mature crucian carp of both sexes were exposed for 28 days to domestic treated sewage effluent running with a constant flow of water, with tap water and with different concentrations of the sewage effluent (25%, 50% and 100%). Vitellogenin (VTG), gonadosomatic index (GSI), hepatosomatic index (HSI), and histological abnormalities were used to assess the estrogenic potency of the effluent. Results show a significant () increase in VTG levels in all exposed male fish. A significant () reduction in the GSI was only observed in fish exposed to 100% effluent. Morphological changes were detected by histological evaluation, revealing severe effects on the testes. Spermatogenesis was progressively reduced to total inhibition in fish exposed to 100% effluent. One of the most pronounced effects detected was the presence of oocytes in male gonads, observed in 20% of males exposed to 100% sewage effluent. [Copyright &y& Elsevier]
- Published
- 2005
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