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portuguesO uso de produtos naturais, como oleos essenciais (OEs), e uma nova abordagem potencial para o tratamento de infeccoes bacterianas em peixes com um baixo risco de desenvolvimento de resistencia. Existem estudos reportando a atividade de OEs como aqueles obtidos das especies Achyrocline satureioides, Aniba parviflora, Aniba rosaeodora, Anthemis nobilis, Conobea scoparioides, Cupressus sempervirens, Illicium verum, Lippia origanoides e Melaleuca alternifolia contra bacterias. Porem, existem poucos estudos investigando o efeito desses OEs supracitados contra bacterias isoladas de peixes. Portanto, o objetivo desse estudo foi avaliar a atividade antibacteriana in vitro desses OEs contra bacterias isoladas de peixes (Aeromonas hydrophila, Citrobacter freundii e Raoultella ornithinolytica). Assim como avaliar a atividade antibacteriana in vivo do OE de L. origanoides contra uma infeccao por A. hydrophila experimentalmente induzida em jundia (Rhamdia quelen). O OE de L. origanoides foi escolhido porque apresentou a melhor atividade antibacteriana in vitro, com concentracoes inibitorias minimas variando de 0,2 a 0,8 mg mL-1. Esse OE apresentou sucesso terapeutico de 58,33% no dia 30 pos-infeccao. Portanto, sugerimos que o OE de L. origanoides possa ser uma alternativa viavel no tratamento da infeccao por A. hydrophila em peixes. Palavras-chave: Aeromonas hydrophila; atividade antibacteriana; jundia; longevidade; sucesso terapeutico. EnglishThe use of natural products, such as essential oils (EOs), is a potential novel approach to treat fish bacterial infections with a lower risk of developing resistance. There has been a number of studies reporting the activity of EOs as those obtained from the species Achyrocline satureioides, Aniba parviflora, Aniba rosaeodora, Anthemis nobilis, Conobea scoparioides, Cupressus sempervirens, Illicium verum, Lippia origanoides, and Melaleuca alternifolia against bacteria. However, there are few studies investigating the effect of these EOs against fish bacteria. Therefore, the aim of this study was to evaluate the in vitro antibacterial activity of EOs against the following fish bacteria, Aeromonas hydrophila, Citrobacter freundii, and Raoultella ornithinolytica. Additionally, the in vivo antibacterial activity of the EO L. origanoides was evaluated against experimentally induced A. hydrophila infection of silver catfish (Rhamdia quelen). The EO of L. origanoides was chosen as it showed the highest in vitro antibacterial activity, with minimum inhibitory concentrations ranging from 0.2 to 0.8 mg mL-1. This EO also presented a therapeutic success of 58.33%, on a 30 day A. hydrophila infection. Therefore, we suggested that the EO of L. origanoides may be a viable alternative as a treatment for A. hydrophila infection. Key words: Aeromonas hydrophila; antibacterial activity; silver catfish; longevity; therapeutic success

Plant essential oils against bacteria isolated from fish: an in vitro screening and in vivo efficacy of Lippia origanoides