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The study evaluated the use of the essential oil of Aloysia triphylla (EOAT) as stress reducer in transporting Nile tilapia, Oreochromis niloticus. Juveniles were transported for 8 h in plastic bags by car with water containing 0 (control), 20 or 30 μL L-1 EOAT (three replicates). We evaluated water quality, net ion fluxes (Cl−, Na+ and K+) and, plasma parameters (cortisol, glucose, lactate and paraoxonase) and ventilatory rate (VR) of Nile tilapia. There was no mortality in juveniles undergoing transport. Nile tilapia transported with 20 or 30 μL L-1 EOAT presented lower pH than control group and with 30 μL L-1 EOAT presented lower water conductivity, alkalinity and Cl−, Na+ and K+ net ion fluxes compared to other treatments. The EOAT did not alter plasma cortisol and paraoxonase levels, but reduced VR, and 30 μL L-1 EOAT reduced plasma glucose levels compared to the control group after transport. The use of 20 μL L-1 EOAT increased plasma lactate levels compared to other treatments. The use of 30 μL L-1 EOAT for sedation in 8 h transport of Nile tilapia is recommended because it improved water quality and reduced ionic losses, plasma glucose levels and VR.

Óleo essencial de Aloysia triphylla é efetivo no transporte de tilápia do Nilo