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Journal of Medical Sciences
Year: 2013  |  Volume: 13  |  Issue: 5  |  Page No.: 367 - 372

Antibacterial Activity of Essential Oils and their Effects on Nile Tilapia Fingerlings Performance

S.A. Shehata, M. S. Mohamed and S. Abd El-Shafi    

Abstract: This study investigated the antibacterial activity of five essential oils in-vitro. Also, the strongest antibacterial oil (thyme oil) was tested on performance of Nile tilapia (Oreochromis niloticus) fingerlings fish. Two experiments were carried out, in the first one antimicrobial activity of essential oils (EOs) of 5 medicinal plants, ginger, black cumin, thyme, clove and watercress were evaluated (in-vitro). The screening of antibacterial activity was against Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli, Listeria monocytogenes, Lactococcus lactis and Bacillus cereus. In the second experiment (in-vivo) 120 fish were divided in 4 groups. There were 3 replicate glass aquaria (per group) of 10 fish per aquarium. The 1st group fed basal diet (control) and the other groups (2-4) were fed basal diet supplemented with 0.1, 0.25 and 0.5% thyme oil. First experiment showed that thyme oil had the strongest antibacterial activity against all tested bacteria except Staph. aureus and E. coli. The more sensitive bacteria to thyme oil was Pseud. aeruginosa while. E. coli was least susceptible to it. Second experiment, showed that thyme oil significantly increase growth rate, feed intake and feed utilization of fish. The best level was 0.25%. Total protein and globulin concentrations in plasma were significantly increased by 0.1 and 0.25% thyme oil. The best economical efficiency was obtained by 0.25% thyme oil.

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