الفهرس 
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Abstract
The current study was delineated to evaluate the possible growth promoting, immunostimulant effects and biochemical improvement of antibiotics (oxytetracycline and erythromycin), commercial probiotic (B. subtilis) or gut isolated Bacillus strains (B. amyloliquefaciens; 7 H N and B. cereus; 29 H N) and disease resistance in Nile tilapia against Aeromonas hydrophila infections.
In this study, 315 apparently healthy nile tilapia were allocated into 6 equal groups; each group has three replicates except control group has six replicates; 15 fish/ replicate). The diet was given four times daily. The feeding period was lasted for 60 days after that, the control group was allocated into 2 equal groups so become seven groups each group contains 45 fish and transfer them to glass aquaria to make challenge test.
Experimental design:-
group 1 fed on basal diet without additives or infection.
group 2 fed on basal diet + oxytetracycline, (100 mg/kg b.wt).
group 3 fed on basal diet + erythromycin, (100 mg/kg b.wt).
group 4 fed on basal diet + commercial B. subtilis, (1 x 1010 CFU g-1 feed).
group 5 fed on basal diet + isolated gut B. amyloliquefaciens, (7 H N; 1 x 1010 CFU g-1 feed).
group 6 fed on basal diet + isolated gut B. cereus, (28 H N; 1 x 1010 CFU g-1 feed).