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vol.17 número2Population and reproductive parameters of the red-tailed catfish, Phractocephalus hemioliopterus (Pimelodidae: Siluriformes), from the Xingu River, BrazilNew species of Leporinus (Characiformes: Anostomidae) from the highlands of the Guiana Shield in Venezuela índice de autoresíndice de assuntospesquisa de artigos
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Neotropical Ichthyology

versão impressa ISSN 1679-6225versão On-line ISSN 1982-0224


ALMEIDA, Ana Paula Gottlieb et al. Stress-reducing and anesthetic effects of the essential oils of Aloysia triphylla and Lippia alba on Serrasalmus eigenmanni (Characiformes: Serrasalmidae). Neotrop. ichthyol. [online]. 2019, vol.17, n.2, e190021.  Epub 18-Jul-2019. ISSN 1982-0224.

Anesthetic effect of Aloysia triphylla and Lippia alba essential oils (EOs) in the Amazonian fish Serrasalmus eigenmanni was evaluated. The fish were placed in aquaria containing A. triphylla or L. alba EOs (25 to 200 µL L-1). Then, fish were transferred to aquaria containing EO-free water to evaluate their recovery time. In another experiment, fish were transferred to aquaria containing A. triphylla or L. alba EOs (3 to 10 µL L-1) and swimming behavior was analyzed for up to 240 min of exposure. Water samples were collected at 0 and 240 min and blood samples were collected at 240 min. Tested concentrations induced all stages of anesthesia, except 25 µL L-1 A. triphylla EO and 50 µL L-1 L. alba EO, which only induced sedation. Prolonged exposure to both EOs reduced swimming time compared to the control at all evaluated times. The fish exposed to 3 µL L-1 A. triphylla EO showed a lower net K+ efflux compared to ethanol-exposed fish; in those exposed to 5 µL L-1, ammonia excretion was reduced. The blood parameters did not show significant differences between treatments. In conclusion, both EOs can be used as anesthetics and sedatives for transport of S. eigenmanni.

Palavras-chave : Amazonian blackwaters; Anesthesia; Ion fluxes; Piranha; Stress.

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