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The antioxidant enzyme activities and thiobarbituric acid reactive substance (TBARS) levels in the liver and red cells of two groups of rainbow trout were compared in these investigations.

The fish in the first group were raised in freshwater, while the others were transplanted from freshwater to sea water when they were 5 to 6 months old. In hepatic and extrahepatic tissues of both fish groups, catalase (CAT), glutathione peroxidase (GPX), and glutathione S-transferase (GST) activities were significantly increased. The seawater-adapted trout have lower superoxide dismutase (SOD) activity than the freshwater-cultured trout. In comparison to freshwater trout, the seawater-adapted trout had significantly greater levels of TBARS in both tissues. Additionally, it was noted that the seawater-adapted red.

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