4 documents found, page 1 of 1
Recovery of fat snook, Centropomus parallelus (Teleostei: Perciformes) after su...
Oss, Rodrigo Nunes; Baroni, Vinícius Dadalto; Duarte, Rafael Mendonça; Val, Adalberto Luis; Almeida-Val, Vera Maria Fonseca; Gomes, Levy de CarvalhoWe studied the recovery of juvenile fat snook (Centropomus parallelus) after subchronic exposure to different concentrations of copper. Healthy juveniles (1.98 g) were exposed to 25 or 50 μg Cu/L for 30 days (12 replicates with 5 fish in each one), and recovery was observed at 0, 4, 10, and 30 days after exposure (3 replicates with 5 fish in each one). Copper genotoxicity in exposed individuals was observed usi...
Regulation of gill transcellular permeability and renal function during acute h...
Wood, Chris M.; Iftikar, Fathima I.; Scott, Graham R.; Boeck, Gudrun de; Sloman, Katherine A.; Matey, Victoria E.; Domingos, Fabíola Xochilt ValdezEarlier studies demonstrated that oscars, endemic to ion-poor Amazonian waters, are extremely hypoxia tolerant, and exhibit a marked reduction in active unidirectional Na+ uptake rate (measured directly) but unchanged net Na+ balance during acute exposure to low Po2, indicating a comparable reduction in whole body Na+ efflux rate. However, branchial O2 transfer factor does not fall. The present study focused on...
Dissolved organic carbon from the upper Rio Negro protects zebrafish (Danio rer...
Duarte, Rafael Mendonça; Smith, Donald Scott; Val, Adalberto Luis; Wood, Chris M.The so-called â œ blackwatersâ of the Amazonian Rio Negro are rich in highly coloured dissolved organic carbon (DOC), but ion-poor and very acidic, conditions that would cause fatal ionoregulatory failure in most fish. However these blackwaters support 8% of the worldâ ™ s ichthyofauna. We tested the hypothesis that native DOC provides protection against ionoregulatory dysfunction in this extreme environment. D...
Roundup® exposure promotes gills and liver impairments, DNA damage and inhibiti...
Braz-Mota, Susana; Sadauskas-Henrique, Helen; Duarte, Rafael Mendonça; Val, Adalberto Luis; Almeida-Val, Vera Maria FonsecaRoundup Original® (RD) is a glyphosate-based herbicide used to control weeds in agriculture. Contamination of Amazon waters has increased as a consequence of anthropogenic pressure, including the use of herbicides as RD. The central goal of this study was to evaluate the toxic effects of RD on juveniles of tambaqui (Colossoma macropomum). Our findings show that biomarkers in tambaqui are organ specific and depe...