| income evaluation of small - scale fishers in two brazilian urban reservoirs: represa billings (sp) and lago paranoá (df). | the income of small-scale fisheries of two urban reservoirs in brazil: represa billings (127 km2) located in the metropolitan region of são paulo, the capital city of the state of são paulo and lago paranoá (38 km2) located in brasília (df), the capital city of brazil were calculated and compared. both fisheries are mainly based on the alien nile tilapia oreochromis niloticus (more than 80% of the total catch). although these reservoirs are nearly 900 km apart, their native fish fauna belong to ... | 2006 | 17119829 |
| sediment genotoxicity in the tietê river (são paulo, brazil): in vitro comet assay versus in situ micronucleus assay studies. | the in vitro comet assay with the permanent fish cell line rtl-w1 and the in situ micronucleus assay using erythrocytes from indigenous tilapia (oreochromis niloticus) were used to detect genotoxicity in tietê river sediments (são paulo, brazil). either test was successful in identifying site-specific differences in genotoxicity, with a high correlation between in situ and in vitro results indicating the relevance of the latter even for environmental studies. discharges from são paulo city have ... | 2009 | 19477010 |
| dynamics of cytochrome p450 inducers in polluted sites of são paulo city reservoirs. | the first analysis of water pollutants using biomarkers at the guarapiranga reservoir, which supplies water for one-third of the population of the são paulo megalopolis (brazil), is reported. studies were performed before and after the start of water pumping to the guarapiranga from the highly polluted billings reservoir. billings's water was purified by passing through the natural wetland located near guarapiranga. liver enzymes of oreochromis niloticus (tilopias) obtained from both reservoirs ... | 2004 | 15261731 |
| piscinoodinium pillulare (schäperclaus, 1954) lom, 1981 (dinoflagellida) infection in cultivated freshwater fish from the northeast region of sao paulo state, brazil. parasitological and pathological aspects. | the aquaculture center of unesp, jaboticabal, sp, brazil, received fishes for diagnosis from fish farmers reporting fish crowding at pond edges and in water inlets. fifty-three out of 194 cases showed round to oval, immobile whitish structures, measuring up to 162 microm diameter, identified as the dinoflagellate piscinoodinium pillulare. in 34 diagnosed cases the parasites were present in the gills, in 2 on body surface, and 9 in both. thirty-one out of 53 were tambacu hybrids hosts; 7, piaract ... | 2002 | 12071320 |