Essential oil of Ocimum basilicum and Eugenol as Sedatives for Nile Tilapia

Abstract

This study evaluated the modulation of the ventilatory frequency of Nile tilapia sedated with essential oil of Ocimum basilicum and eugenol. The fish were exposed to the following treatments: control (water only); ethanol 200 µl L-1 (concentration used to dilute the anesthetic); eugenol 10 µl L-1 and 20 µl L-1; essential oil of O. basilicum at the concentration of 10 µl L-1 and 20 µl L-1. After 90 minutes of exposure to the treatments, water quality, mortality and respiratory rate were determined. The concentration of 20 µl L-1 of the essential oil of O. basilicum and eugenol showed a sedative effect and reduced the excretion of metabolic ammonia in Nile tilapia. There was no mortality in fish exposed to the treatments. The respiratory rate did not differ between the different treatments. It is concluded that the concentration of 20 µl L-1 of the essential oil of O. basilicum and eugenol shows the best result in the inducing sedative effect for Nile tilapia, and that the essential oil of O. basilicum and eugenol in the concentrations of 10 µl L-1 and 20 µl L-1 in an exposure period up to 90 minutes do not alter the ventilatory frequency of Nile tilapia.

Efficiency of Ocimum basilicum and Eucalyptus globulus essential oils on anesthesia and histopathology of rainbow trout, Oncorhynchus mykiss

“…basilicum , essential oil contain high levels of estragole (72.57%) and linalool (21.60%). Similarly, Ventura et al (2020) noted that major constituents of the O . basilicum essential oil were methyl chavicol (estragole) (66.51%) and linalool (20.90%).…”

“…In the present study, it was determined that basil, O. basilicum, essential oil contain high levels of estragole (72.57%) and linalool (21.60%). Similarly, Ventura et al (2020) noted that major constituents of the O.…”

“…It is an economically important plant distributed in several regions all over the world (Baritaux et al, 1992). The major components of O. basilicum essential oil were methyl chavicol and linalool (Ventura et al, 2020). O. basilicum essential oil also stands out for its anesthetic and sedative properties (Limma-Netto et al, 2016Ventura et al, 2021).…”

“…The major components of O . basilicum essential oil were methyl chavicol and linalool (Ventura et al, 2020). O .…”

Evaluation of Anaesthetic Effect of Commercial Basil Ocimum basilicum on Zebrafish (Danio rerio) Embryos

“…Studies reported that the best concentration of O. gratissimum essential oil can induce anesthesia in O. niloctilus juveniles ranging from 90 to 150 mg/L [25], while other authors reported a concentration between 60 and 100 mg/L [26]. The experimental study showed that the essential oil of O. basilicum at 20 µL/L can induce mild sedation without loss of balance and ventilation in Nile tilapia juveniles [27]. Other studies showed an anesthetic effect of eugenol at low dosages of 20 µL/L [28] and at a higher dosage of 60 mg/L [29].…”