Research Information System
Acta Aquatica Turcica, vol.15, no.4, pp.440-447, 2019 (Peer-Reviewed Journal)
In this study, the antibacterial activities of the essential oils of thyme (Thymus vulgaris L.) (TEO), laurel (Laurus nobilisL.) (LEO), rosemary (Rosmarinus officinalis L.) (REO) and parsley (Petroselinum crispum L.) (PEO) against different fishpathogens such as Yersinia ruckeri two strains (a & b), Lactococcus garvieae, Pseudomonas fluorescens, Aeromonas sobria,Aeromonas salmonicida and Aeromonas veronii were investigated. The essential oils had been extracted by hydro-distillationusing a Clevenger apparatus, and their antibacterial activities were measured by paper disk diffusion method. Theantibacterial activities of essential oils showed significant differences depending on the plant source and on bacterial strain.All essential oils showed inhibitory effect against bacterial fish pathogens (except PEO against Y. ruckeri (b)), and theinhibition zones ranged from 6.00 to 36.00 mm. The highest antibacterial activity against all tested bacteria was determinedin TEO with a diameter of inhibition zone ranging from 26.50 to 36.0 mm, while LEO and REO showed a moderate activitywith a diameter of inhibition zone ranging from 9.50 to 18.50 mm. The PEO illustrated the lowest diameter of inhibition zoneagainst all the test bacteria. Among the tested bacteria, A. veronii was the most sensitive to the inhibitory activity of TEO,LEO and REO, while P. fluorescens was the most resistant. The results suggested that essential oils from thyme, laurel androsemary can be used as natural antibacterial agents against bacterial fish pathogens.