The Influence of Some Probiotics on the Growth Performance and Intestinal Microbial Flora of O

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 postaddition 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