Eugenol as an anesthetic for Nile tilapia

• Autor(a) principal: Vidal, Luiz Vítor Oliveira
• Data de Publicação: 2008
• Outros Autores: Albinati, Ricardo Castelo Branco, Albinati, Ana Catarina Luscher, Lira, Alessandra Danile de, Almeida, Tainá Rocha de, Santos, Gisele Baiana
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Pesquisa Agropecuária Brasileira (Online)
• Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/498
• topic: Oreochromis niloticus; anesthesia; cost; safety; Oreochromis niloticus; anestesia; custo; segurança

The objective of this work was to evaluate eugenol as anesthetic for Nile tilápia. For the best concentration of the anaesthetic, six treatments (50, 75, 100, 150, 200, and 250 mg L-1) were evaluated, with ten fi shes per treatment, anesthetised individually and monitored during the induction and recovery. Toxicity was estimated in 210 fi sh submitted to seven eugenol concentrations (50, 75, 100, 150, 200, 250, and 300 mg L-1) for 600 s; and for safety margin, 120 fi sh were submitted to 75 mg L-1 for fi ve time intervals (600, 1,200,1,800, and 2,400 s). The effective concentrations were 50 and 75 mg L-1. Lethal concentration (LC) values for 600 s were: LC01 81.97 mg L-1, LC50 184.26 mg L-1, and LC99 286.55 mg L-1. Times of lethal concentration (TLC) were TLC01 566.97 s, TLC50 1,611.66 s, and TLC99 2,656.34 s. For fast deep anesthesia, 75 mg L-1 of eugenol is recommended, with a safety margin of 484,27 s; for long period anesthesia (600 s) 50 mg L-1 were recommended. The higher therapeutic concentration costs R$ 0.065 per liter. Eugenol was effective for euthanasia at 286.55 mg L-1 for 600 s.