Özet:

Essential oils of twenty-four plant species were obtained by hydrodistillation and investigated for their antibacterial effects against seven fish pathogenic bacteria (Aeromonas hydrophila, Aeromonas salmonicida, Vibrio anguillarum, Yersinia ruckeri, Enterococcus faecalis, Lactococcus garvieae and Streptococcus agalactiae). The antibacterial activity results of the essential oils obtained by disc diffussion method showed strong activities against all pathogens. In general, whole essential oils except Artemisia absinthium exhibited strong antibacterial effects against the most of the fish pathogens. However, the essential oil of A. absinthium showed weak antibacterial effect against only A. hydrophila. Mostly seven essential oils of the plants (T. spicata, T. vulgaris, L. nobilis, C. verum, H. plicatum and A. citriodora Paláu) among twenty-four essential oils exhibited good antibacterial activity against all fish pathogens. When compared to the tested antibiotics (furazolidon, oxytetracycline, cephalothin, and trimethoprim/sulfamethoxazole), the antibacterial effects of essential oils were mostly obtained equivalent or stronger. Considering the antibacterial activity results of the essential oils, their alternative use in lieu of antimicrobial agents against bacterial fish diseases might be convenient in the aquaculture.

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