The objective of the present study was to understand the
influence of some types of probiotics on the growth parameters
and the intestinal microbial flora of O. niloticus. The fish were
divided into three groups, the first one fed on diet supplemented
with dead Saccharomyces cerevisae yeast, the second group fed on
diet supplemented with live Bacillus subtilis and Saccharomyces
cerevisae while the third group was served as control fed on basal
diet. After six weeks the results indicated that, the fish groups
received probiotics supplemented diets revealed significant
improvement in growth parameters (body Weight gain, feed
conversion ratio, protein efficiency ratio, protein efficiency ratio ).
On the other hand, the examination of intestinal microbial flora pre
– and post- addition of probiotics showed that, the intestinal of the
second group at the end of experimental period showed failure in
re-isolation of some pathogenic bacteria. Dead S. cerevisae
supplemented diet has no effect
Key Words: Probiotic, S. cerevisae. B. subtilis, intestinal flora,
growth parameters