This study evaluated the anesthetic and sedative effects of the essential oil of Zingiber officinale (EOZO) on juvenile pacu (Piaractus mesopotamicus). Experiment 1 evaluated concentrations of 0, 50, 100, 200 and 400 mg L^-1 EOZO for times of induction and recovery from anesthesia. Furthermore, hematological responses and residual components of EOZO in plasma were determined immediately after anesthesia. Experiment 2 evaluated the effect of 0, 10, 20 and 30 mg L^-1 EOZO on water quality, blood variables and residual components of EOZO in plasma and tissues (muscle and liver) immediately after 2 h of transport. Survival was 100%. The three main compounds of EOZO [zingiberene (32.27%), β-sesquiphellandrene (18.42%) and β-bisabolene (13.93%)] were observed in animal plasma and tissues (muscle and liver) after anesthesia and transport, demonstrating a direct linear effect among the evaluated concentrations. The concentration of 200 mg L^-1 EOZO promoted surgical anesthesia of pacu and prevented an increase in monocyte and neutrophil levels, yet did not alter other hematological parameters. The use of 30 mg L^-1 EOZO has a sedative effect on juvenile pacu, thereby reducing oxygen consumption during transport. Furthermore, the use of 30 mg L^-1 EOZO in transport water prevented an increase in hemoglobin and hematocrit, with minimal influences on other blood variables.

本研究评估了生姜精油(EOZO) 对幼年鲹鱼 ( Piaractus mesopotamicus ) 的麻醉和镇静作用。实验1评估0、50、100、200和400 mg L ^-1 EOZO浓度的麻醉诱导和恢复时间。此外，麻醉后立即测定血液学反应和血浆中EOZO的残留成分。实验2评估了0、10、20和30 mg L ^-1 EOZO在运输2小时后对水质、血液变量以及血浆和组织（肌肉和肝脏）中EOZO残留成分的影响。存活率为100%。麻醉和运输后，在动物血浆和组织（肌肉和肝脏）中观察到 EOZO 的三种主要化合物 [姜烯 (32.27%)、β-倍半芹烯 (18.42%) 和 β-红没药烯 (13.93%)]，表现出直接线性关系评估浓度之间的影响。 200 mg L ^-1 EOZO浓度促进pacu的手术麻醉并防止单核细胞和中性粒细胞水平的增加，但不改变其他血液学参数。使用30 mg·L ^-1 EOZO对幼年巴库有镇静作用，从而减少运输过程中的耗氧量。此外，在运输水中使用30 mg L ^-1 EOZO 可以防止血红蛋白和血细胞比容的增加，对其他血液变量的影响最小。