Tea tree (Melaleuca alternifolia) and geranium (Pelargonium graveolens) essential oils as new anesthetics in rainbow trout (Oncorhynchus mykiss)Didinen, Hakan (Avtor) Oncorhynchus mykissanesthesiahistopathologytea treegeraniumIn the present study was investigated anesthetic and histopathological effects of tea tree (Melaleuca alternifolia) and geranium (Pelargonium graveolens) essential oils in rainbow trout. These essential oils were applied at 20, 50, 70, 100, 150, 200, 300, 400, 500 and 600 mg L-1 concentrations to determine the anesthetic effect. As a result of this study, major components were found as beta-citronellol (27.52%) for geranium oil and 4-terpineol (40.77%) for tea tree oil. The lowest effective doses of geranium and tea tree oils were 400 mg L-1 and 300 mg L-1 for deep anesthesia of fish, respectively. At these doses, anesthesia induction and recovery times were 129.00 and 247.00 s for geranium essential oil, 118.67 and 65s for tea tree essential oil, respectively. No histopathological findings in liver, kidney and gill tissues were observed in anesthetized fish for each essential oil. In conclusion, geranium and tea tree oils can use as safe and effective anesthetics for rainbow trout.20252026-08-06 14:18:48Članek v reviji185486sl