17 U. Ispr M. E. Yonar O. B. Oz Journal of Animal and Plant Sciences JAPS 20112011/06/01 21 3 566-569 1018-7081 NA <p>This study evaluated the influence of diets supplemented with 0, 80, 160, 240 mg kg&minus;1 (E0, E80, E160, E240) of vitamin E on the physiological responses of Nile tilapia (<em>Oreochromis niloticus</em>) fed for 3 months. Weight were not affected by dietary vitamin E concentrations. An increase (p&lt;0.05) on the red blood cells count and on the hemoglobin concentration was obtained on treatments with 80 and 160 mg vitamin E kg&minus;1 relativeto control. Mean corpuscular volume presented a significant increase (p&lt;0.05) on treatment with 240 mg vitamin E kg&minus;1 when compared to control. Mean corpuscular hemoglobin concentration was significantly decreased (p&lt;0.05) on treatment with 240 mg vitamin E kg&minus;1. The vitamin E treatments, we noticed a significant increase (p&lt;0.05) in the number of leucocytes relative to control.&nbsp; Our results suggest that 80 mg vitamin E kg&minus;1 is probably the most suitable concentrations for Tilapia diets, although high vitamin E diets are necessary for quantitative leucocyte increases for tilapia</p> Nile Tilapia, Oreochromis niloticus, vitamin E, blood parameters. Pakistan Agricultural Scientists Forum https://thejaps.org.pk/AbstractView.aspx?mid=2011-JAPS-332