Eugenol as an anesthetic for juvenile common snook

The objective of this work was to evaluate the efficacy of eugenol as an anesthetic for juvenile common snook, and to determine the minimum effective concentration for use in handling procedures. In the first trial, juvenile common snook were subjected to immersion baths at 25, 50, 75, 100, 125, and...

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Published in:Pesquisa agropecuaria brasileira 2013-08, Vol.48 (8), p.1140-1144
Main Authors: Bernardes Júnior, Jurandir Joaquim, Nakagome, Fernando Kojima, Mello, Giovanni Lemos de, Garcia, Silvano, Amaral Júnior, Hilton
Format: Article
Language:English
Subjects:
AGRICULTURE, DAIRY & ANIMAL SCIENCE
AGRICULTURE, MULTIDISCIPLINARY
anestesia
Centropomus undecimalis
manejo de peixes
piscicultura
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Summary:The objective of this work was to evaluate the efficacy of eugenol as an anesthetic for juvenile common snook, and to determine the minimum effective concentration for use in handling procedures. In the first trial, juvenile common snook were subjected to immersion baths at 25, 50, 75, 100, 125, and 150 mg L-1 eugenol concentrations, after which induction and recovery times were evaluated. In the second experiment, the lethal exposure time (LT50) at 75 mg L-1 was estimated. Minimum effective eugenol concentration was 50 mg L-1, andthe stage of deep anesthesia and recovery were, respectively, reached at 126.3 and 208.8 s. At 75 mg L-1, LT50 was 1,314 s, and induction time and recovery were also satisfactory; however, fish cannot tolerate over 229 s exposure. O objetivo deste trabalho foi avaliar a eficácia do eugenol como anestésico para juvenis de robalo-flecha e determinar a concentração mínima eficaz que pode ser utilizada em procedimentos de manejo. No primeiro experimento, juvenis de robalo-flexa foram submetidos a banhos de imersão com concentrações a 25, 50, 75, 100, 125 e 150 mg L-1 de eugenol; em seguida, o tempo de indução e a recuperação foram avaliados. No segundo experimento, o tempo de exposição letal (LT50) a 75 mg L-1 foi estimado. A concentração de eugenol mínima e eficaz foi de 50 mg L-1, e o estágio de anestesia profunda e a recuperação foram alcançados, respectivamente, em 126,3 e 208,8 s. A 75 mg L-1, o LT50 foi de 1.314 s, e o tempo de indução e recuperação foramsatisfatórios; entretanto, os peixes não toleram mais de 229 s de exposição.
ISSN:0100-204X
1678-3921
0100-204X
DOI:10.1590/S0100-204X2013000800049