Efficiency of eugenol as anesthetic for the early life stages of Nile tilapia (Oreochromis niloticus)

Anais da Academia Brasileira de Ciências

Paula A.p. Ribeiro¹  Kleber C. Miranda-filho¹  Daniela C. De Melo¹  Ronald K. Luz¹ 

关键词: anesthesia;    cichlid;    handling;    welfare;    anestesia;    ciclídeo;    manipulação;    bem-estar;   

DOI  :  10.1590/0001-3765201520140024

来源: SciELO

【 摘 要 】

In aquaculture, activities with anesthetic compounds are usually used in order to ensure the welfare of farmed fish, allowing handling out of water with decreased trauma by stress. Presently, there is no information about anesthetic action of eugenol in early life stages of Nile tilapia (Oreochromis niloticus). The objective of this study was to evaluate different concentrations of eugenol for larvae and juveniles of Nile tilapia. Sixty animals were used for each group of weight, group I = 0.02 g; group II = 0.08 g; group III = 0.22 g; group IV = 2.62 g; and group V = 11.64 g. The eugenol concentrations tested were 50, 75, 100, 125, 150 and 175 mg L-1. No mortality was reported during the tests with eugenol. Tilapia larvae with 0.02 g and juveniles around 11.64 g can be anesthetized with eugenol concentrations between 150 and 175 mg L-1, since they determine the shortest sedation time (23 and 72 seconds, for the group of lowest and highest weights, respectively).

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