الفهرس 
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Abstract
This study was performed to evaluate the efficacy of immune
stimulant (Vimolert®
) on aeromonas hydrophila infection in Nile tilapia
fish. The evaluation was done by studying the changes in the
hematological and biochemical parameters, cellular immune response
and histopathological picture. A total number of 150 Nile tilapia fishes
(Oreochormis niloticus) of average body weight (55.00±2g) and average
total length (10±3cm). Fish were given immune stimulant (Vimolert®
)
daily at a dose of 2.5, 3, 3.5 g/100g feed for 4 weeks then infected with
aeromonas hydrophila at a dose of 0.5ml (1*107CFU/ml). At the 6
th
week of experiment, comparing with control gp. (1), The RBCs count,
Hb concentration, Ht value there are no significant changes in groups (3,
4and 5) and showed significant decrease in-group (2). The 2
nd sample
showed highly significant increase in the total leukocyte, neutrophil,
basophil, lymphocyte and monocyte counts in groups (3, 4, 5).
Significant increase in the serum ALT, AST and ALP activities,
bilirubin (total, direct and indirect) concentration, urea and creatinine,
Significant decrease in phagocytic percent, phagocytic index and
lysozyme activity in gp(2).