Abstract
This 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 µL 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 µL L-1. However, most evaluated blood parameters showed compensatory responses due to EO exposure.
Highlights
INTRODUCTIONSeveral procedures of fish culture such as handling, blood sampling, transporting and vaccination often
Several procedures of fish culture such as handling, blood sampling, transporting and vaccination often generate a stress response in the animals (Kiessling et al 2009, Zahl et al 2012)
Since E. marginatus is a target species for aquaculture (Cunha et al 2013, Cavalli 2014, Sanches et al 2014), the present study investigated the anesthetic potential of the essential oil (EO) of A. polystachya in dusky grouper juveniles
Summary
Several procedures of fish culture such as handling, blood sampling, transporting and vaccination often. The EO used in the present study was obtained from leaves of A. polystachya (Griseb.) Moldenke (Verbenaceae), an aromatic native plant widely distributed in subtropical regions of South America, mainly in Paraguay and North Argentina, and popularly known as “burrito”, “poleo de Castilla” or “poleo riojano”. This plant is referred to as a sedative (Del Vitto and Petenatti 1997) and is used against gastrointestinal pain in folk medicine (Filipoy 1994). Some blood parameters were analyzed, aiming to evaluate possible side effects of this EO
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