The aim of this study was to investigate the anesthetic efficiency of coriander (Coriandrum sativum) and thyme (Origanum onites) essential oils at different concentrations (20, 50, 70, 100, 150, 200, 300, 400, 500, 600 mg L⁻¹) on rainbow trout (Oncorhynchus mykiss). Additionally, the histopathological effects of essential oils were investigated on the fish tissues including gill, liver and kidney. At the end of the experiment, coriander essential oil was observed to be sedative at 50 mg L⁻¹ and had an anesthetic effect at a concentration of 200 mg L⁻¹ in rainbow trout. However, thyme essential oil caused mortality at the tested concentrations in rainbow trout. Histopathological examination, hyperemia, edema and desquamation were observed in the thyme group’ gills. Also, liver and kidney hyperemia was noticed in this group. No pathological findings were observed in any organ of fishes in the coriander group. The present study demonstrated that concentrations of 200 mg L⁻¹ coriander essential oil can be used as an anesthetic for rainbow trout.

本研究的目的是研究不同浓度（20、50、70、100、150、200、300、400、500、600 mg·L）的香菜（Coriandrum sativum）和百里香（Origanum onites）精油的麻醉效果。 ⁻¹ ) 在虹鳟鱼 ( Oncorhynchus mykiss ) 上。此外，还研究了精油对鱼类组织（包括鳃、肝脏和肾脏）的组织病理学影响。在实验结束时，观察到芫荽精油在 50 mg L ^{-1时具有镇静作用，在 200 mg L -1}浓度时具有麻醉作用在虹鳟鱼中。然而，百里香精油在测试浓度下会导致虹鳟鱼死亡。百里香组鳃部组织病理学检查可见充血、水肿、脱屑。此外，该组还观察到肝肾充血。芫荽组鱼类的任何器官均未观察到病理结果。本研究表明，浓度为 200 mg L ^-1的芫荽精油可用作虹鳟鱼的麻醉剂。