الفهرس 
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Abstract
A. hydrophila is the most common bacteria in fresh water
habitats throughout the world, which it causes motile Aeromonas
Septicemia (MAS), and both antibiotics and probiotics have the
ability to resist bacterial diseases, and it found that they are
effective against MAS beside that the use of antibiotics and
probiotics improve fish health, and growth rate.
This study was carried out on 362 Clarias gariepinus obtained
alive from Muwies canal at Zagazig city. A total number of 50 Nile
catfish of different body weight which were showed signs of
Hemorrhagic Septicemia (pale gills, bloated appearance, and skin
ulcerations) used for A. hydrophilas isolation, the rest 312 Nile
catfish were divided in to two equal groups to study prophylactic
and treatment effect of antibiotics and probiotics. Each group which
consists of 156 Nile catfish allocated into thirteen groups in two
replicates according to their body weights. G 1 was regularly fed
with basal diet; G2, 3, and 4 were regularly fed with basal diet
supplemented with oxytetracyline at concentration of 0.3, 0.6, and
1.2g/kg diet respectively; G5, 6, and 7 were regularly fed with basal
diet supplemented with florofenicol at concentration of 5, 10, and
15ml/kg diet respectively; G8, 9, and 10 were regularly fed with
basal diet supplemented with biogen at concentration of 0.5, 1, and
2g/kg diet respectively; and G11, 12, and l3 were regularly fed with
basal diet supplemented with yeast at concentration of 0.5, 1, and
2g/kg diet respectively.
One divide used to prophylactic study, in which feeding rate
was 5% from total weight and four times daily, fish of each group
were weighted every four weeks during sixteen weeks for