الفهرس 
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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.