LIPID PEROXIDATION AND SUPEROXIDE DISMUTASE ACTIVITY IN SILVER CATFISH (Rhamdia quelen) JUVENILES EXPOSED TO DIFFERENT DISSOLVED OXYGEN LEVELS
DOI:
https://doi.org/10.5216/cab.v9i3.4944Abstract
Fish are usually exposed to episodes of environmental and physiological hypoxia, and are likely to produce elevated levels of reactive oxygen species. Therefore, silver catfish (Rhamdia quelen) juveniles were exposed to different dissolved oxygen levels (severe hypoxia: 1.96 ± 0.08, moderate hypoxia: 3.10 ± 0.10 and normoxia: 6.15 ± 0.03 mg.L-¹) for 30 days to verify if these conditions may induce any oxidative stress in the liver and muscle of this species. The levels of lipid peroxidation and superoxide dismutase activity in liver and muscle were higher in fish exposed to severe and moderate hypoxia than in those exposed to normoxia. This result suggests that low dissolved oxygen levels in the water lead to lipid peroxidation, but at the same time there is an increase of superoxide dismutase activity, maintaining the oxidative equilibrium.
KEY WORDS: Anti-oxidant enzymes, free radicals, hypoxia, normoxia.
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