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- Anesthesia of Epinephelus marginatus with essential oil of Aloysia polystachya: an approach on blood parametersPublication . Fogliarini, Carine O.; Garlet, Quelen I.; Parodi, Thaylise V.; Becker, Alexssandro G.; Garcia, Luciano O.; Heinzmann, Berta M.; Pereira, Ana Maria S.; Baldisserotto, BernardoThis study investigated the anesthetic potential of the essential oil (EO) of Aloysia polystachya in juveniles of dusky grouper (Epinephelus marginatus). Fish were exposed to different concentrations of EO of A. polystachya to evaluate time of induction and recovery from anesthesia. In the second experiment, fish were divided into four groups: control, ethanol and 50 or 300 mu L L-1 EO of A. polystachya, and each group was submitted to induction for 3.5 min and recovery for 5 or 10 min. The blood gases and glucose levels showed alterations as a function of the recovery times, but Na+ and K+ levels did not show any alteration. In conclusion, the EO from leaves of A. polystachya is an effective anesthetic for dusky grouper, because anesthesia was reached within the recommended time at EO concentrations of 300 and 400 mu L L-1. However, most evaluated blood parameters showed compensatory responses due to EO exposure.
- Can the essential oil of Aloysia triphylla have anesthetic effect and improve the physiological parameters of the carnivorous freshwater catfish Lophiosilurus alexandri after transport?Publication . Becker, Alexssandro G.; Luz, Ronald Kennedy; Mattioli, Cristiano Campos; Nakayama, Cintia Labussiere; de Souza e Silva, Walisson; Paes Leme, Fabiola de Oliveira; Pinto de Mendonca Mendes, Helena Correa; Heinzmann, Berta Maria; Baldisserotto, BernardoThe Lophiosilurus alexandri is an important species to the Brazilian aquaculture. Moreover, the studies about the effects of essential oil (EO) of Aloysia triphylla in fish are almost absent. Thus, the aims of this study were: 1) to investigate the anesthetic effect of the EO of A. triphylla and, 2) if this EO improves the physiological parameters of L. alexandri after transport. The experiment was divided in three steps: 1) the anesthesia induction with the EO of A. triphylla (in mu L/L): 25, 50, 100, 200, or 400; 2) transport for 4 h with the fish separated into three groups: control and two EO concentrations of A. triphylla (in mu L/L): 12.5 and 25; and, 3) determination of the ventilatory frequency (VF) in fish exposed to this EO at 12.5 or 25 mu L/L. The results showed that the increasing concentration of A. triphylla EO proportionally decreased the time required for sedation and anesthesia induction and increased recovery time. After transport, some alterations in water and blood parameters were observed independently of the treatment and lower VF was found in fish exposed to 25 mu L/L of A. triphylla EO. Taken together these results indicated that this EO decreased fish metabolism. Finally, A. triphylla EO was an efficient anesthetic in L. alexandri, mainly at 400 mu L/L and, both EO concentrations used in the transport contributed to improve water and physiological parameters.