Aceite de clavo como anestésico para el pez pacu (piaractus mesopotamicus)

Abstract

In order to minimize damage to fish caused by the use of anesthetic substances, this study was to evaluate the concentration of clove oil as an anesthetic most appropriate for pacu (Piaractus mesopotamicus). A total of 40 fishes, with average weight of 716.18 g. The treatments were: anesthetic procedures with solutions of different concentrations of clove oil, 30, 60, 90, 120 and 150 mg.L-1. We used two glass aquariums: one with 20 liters of water containing the anesthetic solution for each treatment and the other with 20 liters of clean water, the animals return to the condition of sedation. Were observed individually: the time to reach deep anesthesia and recovery time of deep anesthesia. The experimental design was completely randomized design with five treatments (concentrations of clove oil) and eight replicates (individuals). The data were submitted to regression, with 5% significance level. There was a linear time of anesthesia and return of fish to increasing concentrations of clove oil, and 30 mg.L-1 is sufficient for the induction of the animals, but higher concentrations of up to 150 mg.L-1, still show inductions faster, without loss in time and conditions for the recovery of fish.