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The use of anesthetics in fish farming is a practice to control fish stress. The oscar is a native fish from Amazon and it is of great importance to ornamental fish farming around the World. The aim of this experiment was to evaluate the sedative effect of eugenol in juvenile oscar, it used juveniles with body weight of 4.61 ± 0.83 g and total length of 6.36 ± 0.32 cm. These juveniles were exposed to different concentrations of eugenol and then placed for recovery in aquariums with no eugenol. Four doses were evaluated: 40; 60; 80 and 100 mg/L. The time values of sedation stages and recovery stages, as well as the amount of time to complete sedation and return to normal swimming were analyzed using ANOVA (P<0.05) and polynomial regression. The author observed that the higher the concentration of eugenol is, the less the sedation time is. In the recovery stage, there was no significant effect to the concentrations of 60, 80 and 100 mg/L. The best concentration of eugenol to sedation of juvenile oscar was 80 mg/L.

Eugenol como anestésico para oscar, Astronotus ocellatus