الفهرس 
title : Thyme and Thymol as Immunostimulants in Cultured Oreochromis niloticus
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Abstract
The present study investigated the effects of thyme and thymol as phytoadditives on growth, hematological , and non-specific immunological parameters in cultured Oreochromis niloticus. In this study, ninety (90) Oreochromis niloticus with an average body weight of (50 ± 5) were used. Fish were divided into three groups (30 fish/ group) in triplicate and fed for 8weeks with: group (1) was fed basal diet as a control group, while group (2) was fed basal diet supplemented with thyme at 10g/kg diet and and group (3) was fed basal diet supplemented with thymol at 3g/kg body weight. After 8 weeks of feeding group (2) and group (3) showed particular differences in the growth, immunological and hematological parameters between the experimental group and the control group. However, as compared to control group, a significant increase of phagocytic activity and lysozyme activity was seen in groups (2) and (3). The serum total protein, globulin levels of the treated groups were significantly higher after challenge with Strept.sp in comparison with the control .The results of the present study indicated that dietary supplementation of 10 g/kg of thyme and 3g/kg thymol in in commercial diets could improve growth, some non-specific immunity and biochemical parameters in Oreochromis niloticus and increase survival rate against experimental challenge with Strept.sp.