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We examined the effects of dietary supplementation for 21 days with different levels (0, 0.25 and 2.0 ml/kg) of the Aloysia triphylla essential oil (EOAT) on silver catfish (Rhamdia quelen). Cortisol levels were lower in fish fed EOAT at 2.0 ml/kg diet, and lactate levels were lower in those fed at both doses. Glucose, alanine aminotransferase, aspartate aminotransferase and triglyceride levels did not vary between groups.The biomarkers of oxidative stress, thiobarbituric acid-reactive substances, lipid hydroperoxide, superoxide dismutase, catalase and non-protein thiols, were lower in the brain, liver and muscle of fish fed EOAT at 2.0 ml EO/kg diet. Glutathione-S-transferase, reduced glutathione, plasma Na + , Cl − , and K + , and gill Na + /K + -ATPase and H + -ATPase did not vary between groups. Taken together, our results clearly indicate that the addition of EOAT at 2.0 ml/kg diet improves oxidative status and lowers the stress response in silver catfish. K E Y W O R D Sfood additive, osmoregulatory parameters, oxidative stress

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