EVALUATION OF PROBIOTIC STRAIN SACCHAROMYCES CEREVISIAE AS A FEED SUPPLEMENT IN NILE TILAPIA (OREOCHROMIS NILOTICUS LIN.) DIETS
Sameh, H. Sayed
Central Laboratory for Aquaculture Research, Agriculture Research Center, Ministry of Agriculture, Egypt
Received 23/ 2/ 2012 Accepted 28/ 3/ 2012
Abstract
A 70 days feeding trial was carried out to evaluate the effects of Saccharomyces cerevisiae as a probiotic (Tonilisat) in Nile tilapia diets (0.00, 0.05and 0.10 %) each with three different sizes of Nile tilapia (0.5, 10 and 20 g/fish) on the growth performance, survival rate, feed efficiency, body chemical composition, blood parameters and economic efficiency of mono-sex Nile tilapia (Oreochromis niloticus Lin.) fed on three isonitrogenous, iso-caloric diets (30% Crude protein and 444.58 kcal GE/100g) experimental diets each with three fish sizes each in three replicates, which 15 mono-sex Nile tilapia were stocked in each aquarium (100 l/aquarium). Then, 27 experimental aquaria were used for 9 treatments as a feeding trial. The obtained results showed that the growth performance of fish fed on 0.0 Tonilisat level was the lowest value than fish fed 0.05 or 0.1% Tonilisat. Also the fish weighed 0.5 g /fish fed on diet supplemented with Tonilisat had the best growth performance. The diets containing different probiotic levels significantly (P<0.05) improved Nile tilapia growth and feed utilization compared with free supplemented diets. The present results recommend the incorporation of 0. 5g probiotic/ kg in Nile tilapia diet as supplement to stimulate fish growth with no adverse effects on the blood hematological parameters. These results suggested that Saccharomyces cerevisiae as a probiotic (Tonilisat) in Nile tilapia fry diets can provide beneficial effects on growth, feed utilization and stimulate health statue. The inclusion of the commercial probiotic Tonilisat at 0.5g Kg-1 diet at stocking density rate of 15 fish/m2 of mono-sex Nile tilapia (O. niloticus Lin.) is economically to get the best fish performance with friendly effects on the environment.
KEY WORDS: Nile tilapia, growth performance, probiotic, chemical composition and blood hematological parameters.
