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Aloysia triphylla essential oil as food additive for Rhamdia quelen – Stress and antioxidant parameters

Zeppenfeld, C.C., Saccol, E.M.H., Pês, T.S., Salbego, J., Koakoski, G., dos Santos, A.C., Heinzmann, B.M., da Cunha, M.A., Barcellos, L.J.G., Pavanato, M.A., Caron, B.O., Baldisserotto, B.
Aquaculture nutrition 2017 v.23 no.6 pp. 1362-1367
Aloysia citrodora, H-transporting ATP synthase, Rhamdia quelen, alanine transaminase, antioxidant activity, aspartate transaminase, biomarkers, brain, catalase, chlorides, cortisol, diet, essential oils, food additives, glucose, glutathione, glutathione transferase, lactic acid, lipid peroxides, liver, muscles, oxidative stress, potassium, sodium, stress response, superoxide dismutase, thiobarbituric acid-reactive substances, thiols, triacylglycerols
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.