Abstract
Simple Summary Aquaculture development is limited by several diseases associated with bacteria that have developed resistance to antibiotics. In this context, new treatment alternatives are necessary. The aim of the present study was to evaluate the in vitro antibacterial effects ofSalix babylonicahydro-alcoholic extract against some bacteria that affect rainbow trout (Oncorhynchus mykiss) and tilapia (Oreochromisspp.). The results indicate thatSalix babylonicahydro-alcoholic extract has an antibacterial effect and could be an alternative treatment in diseases caused by microorganisms resistant to drugs in aquaculture. Aquaculture development is limited by bacteria associated with several diseases; antibiotics are used for the treatment of these affections, but bacteria have developed resistance to these drugs. It is important to develop effective treatments that allow the production of antibiotic-free food. The aim of the present study is to evaluate the in vitro antibacterial effects ofSalix babylonicahydro-alcoholic extract (SbHE) againstAeromonas hydrophila,Listonella anguillarum,Edwarsiella tarda,andStreptococcus iniae, bacteria that affectOncorhynchus mykissandOreochromisspp. production. SbHE was obtained through the maceration technique. Reference strains were used and their sensitivity to antibiotics was determined. Minimal inhibitory concentration (MIC) and minimal bactericidal concentration (MBC) of SbHE were determined. Results showed that three of four evaluated bacteria were multidrug resistant, exceptS. iniae. SbHE showed antibacterial activity against all bacteria. Results indicate an MIC of 1.56 to 25 mg/mL and an MBC of 3.12 to 100 mg/mL. The greatest inhibitory activity occurred againstL. anguillarumobtaining a MIC of 1.56 mg/mL and an MBC of 3.12 mg/mL. Results indicate that SbHE has bactericidal activity againstA. hydrophila,L.anguilalurm, andS. iniaeas well as bacteriostatic activity againstE. tardaand could be an alternative treatment against these bacteria.