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Juvenile piapara (Leporinus elongatus) were progressively exposed to several levels of dissolved oxygen for 28 days, severe hypoxia, moderate hypoxia and normoxia, while weight gain, feed conversion, and some antioxidants and biomarkers of oxidative stress were measured in liver and blood. Fish exposed to severe hypoxia showed lower weight gain and feed conversion (1.6) when compared with moderate hypoxia (2.9) and normoxia (1.8). Lipoperoxidation in liver and blood was higher under moderate hypoxia and normoxia compared with severe hypoxia. Activities of catalase, glutathione reductase, and glutathione peroxidase in both liver and blood showed essentially no differences, while superoxide dismutase activities were higher in liver and blood in piapara exposed to severe hypoxia. Nevertheless, oxidized and total glutathione contents in blood and liver in fish exposed to hypoxia were higher than …