| biomarkers in an invasive fish species, oreochromis niloticus, to assess the effects of pollution in a highly degraded brazilian river. | paraiba do sul watershed is one of the most important brazilian water bodies (5.5 million people depend on the river). it is in a critical environmental situation, polluted by industrial discharges, non-treated urban wastes, and pesticides, which have had cumulatively negative effects. this study analyzes the effects of pollution, with a biomarker approach, by using the invasive fish species, oreochromis niloticus, as a sentinel species. the approach comprehends a general biomarker of the health ... | 2008 | 18468656 |
| induced cytochrome p450 1a activity in cichlid fishes from guandu river and jacarepaguá lake, rio de janeiro, brazil. | the induction of cytochrome p4501a-mediated activity (e.g. ethoxyresorufin-o-deethylation, erod) has been used as a biomarker for monitoring fish exposure to ahr-receptor ligands such as polycyclic aromatic hydrocarbons (pah), polychlorinated biphenyls (pcb) and polychlorinated dibenzo-dioxins/furans (pcdd/fs). in this study we found that hepatic erod is induced in fish ("nile tilapia", oreochromis niloticus and "acará", geophagus brasiliensis) from the guandu river (7-17-fold) and jacarepaguá l ... | 2008 | 17602810 |
| induced alkoxyresorufin-o-dealkylases in tilapias (oreochromis niloticus) from guandu river, rio de janeiro, brazil. | the activity of fish monooxygenases has been extensively used as a monitoring tool to detect contamination of water bodies by cytochrome p450-inducing agents. in this study we evaluated the activities of ethoxy- (erod), methoxy- (mrod) and pentoxy- (prod) resorufin-o-dealkylases in the liver of nile tilapias (oreochromis niloticus) collected at the guandu river, at a reference clean site (lake 1) and at two other sampling sites (lakes 2 and 3) in rio de janeiro state, brazil. alkoxyresorufin-o-d ... | 2004 | 14675840 |