Some studies on probiotics as a feed additive in tilapia (oreochromis niloticus) fingerlings [electronic resource].

Includes references.

The current study has been carried out to evaluate the potential benefits of adding either active or inactive yeast (Saccharomyces cerevisae) to the Nile tilapia (Oreochromis niloticus) feed on its performances. The experiment lasted for a 100 days period, using a total number of 150; about 16 g Nile tilapia finger ling which were randomly distributed into 15 aquaria representing 5 groups, each group of3 replicates. Fish were fed a balanced ration at a rate of3% . offish body weight along the experimental period. The five groups were fed basal diet, (TI) without any addition as control, supplied with 0.1 % and 0.2 % active yeast for (T2) and (T3) or supplied with 0.2 % and 0.4 % inactive yeast for T4 and T5 respectively. Results indicated that, the fish fed yeast supplemented diets revealed significant improvement in growth parameters (body weight gain, feed conversion ratio, protein efficiency ratio) and better serological parameters. Also a positive non specific immune induction was realized from the increased amount of total globulins. Meanwhile, feeding the lower level ofactive yeast 0.1 %for (T2) group gave the best results and an economical approach to improve aquaculture outputs, It could be concluded thatfeeding a ration supplemented with 0.1 % active yeast, Saccharomyces cervicae, could improve both health status and growth performance ofNile tilapia.

Summary in Arabic.

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