Effect of origanum vulgare as a feed additive on growth performance, feed utilization and whole body composition of Nile tilapia (Oreochromis Niloticus) fingerlinges challenged with pathogenic Aeromonas Hydrophila [electronic resource].

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The effect of dietary inclusion levels of Origanum vUlgare as a feed additive compared with a control diet for 13 weeks on growth performance, feed utilization, whole body composition, entropathogenic Aeromonas hydrophila-challenge and economic efficiency for production of one Kg gain of Nile tilapia Oreochromi niloficus were stUdied. All experimental diets were iso-nitrogenous (30% crude protein) and iso-caloric (4.42 k caVg diet) with or without Origanum vulgare addition. Fifteen glass aquaria were used, each one was stoked with 15 fish (1.88±0.01gl fish) and three aquaria were designated for each treatment. The five treatments were: treatment 1 (was a control diet without additives), and four treatments (T2,T3,T4,T5) contained 0.5 %. 1.0 %,1.5 % and 2.0 % of Origanum vulgare respectively. Fish were fed on one of these experimental diets at feeding level of 8% of fish body weight for the first four ~eks then reduced to 5% for the next four weeks and then reduced to 3% for the remaining period of the experimental .The feed offered twice daily for six days per week. The results of this study revealed that, fish growth {indicated as final weight, weight gain, daily gain, relative growth rate (RGR), and specific growth rate (SGR)} was increased gradually and the maximum growth was obtained when fish fed the diet contained! % of Origanum vulga/While the lowest growth was obtained from the control group. The highest feed intake and the best feed conversion ratio (FCR) were obtained when fish fed at 1% of Origanum vulgar.

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