The objective of this study is to determine the effect of sublethal copper on the glutathione system and carotenoids of Penaeus indicus postlarvae (PL) when subjected to short- and long-term exposure in the laboratory. The PL were exposed to 0.1641ppm (sublethal) copper for a period of 30 days with sampling intervals of 24, 48, 96h and 10, 20, 30 days. Variations in the activity of Glutathione reductase (GR), Glutathione peroxidase (GPx) and Glutathione-S-transferase (GSTase) were measured as biomarkers of toxicity. A significant (P<0.05) increase in the GR and GPx activity of the exposed PL till 20 days of exposure and thereafter a significant decrease indicates susceptibility of the PL to oxidative stress upon chronic exposure. Similarly, a significant decrease in GSTase activity during long-term exposures in the exposed PL reflects possible failure of the detoxification system. A possible role of carotenoids to combat oxidative stress against copper toxicity is also discussed.
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