The probiotic effects of dietary inactive yeast Saccharomyces cerevisiae var. ellipsoideus on growth factors, survival, body composition and intestinal microbiota of Beluga juvenile (Huso huso)

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Abstract

The probiotic effects of inactive yeast, Saccharomyces cerevisiae var. ellipsoideus was
studied on growth performance, survival and intestinal microbiota of beluga juveniles (Huso
huso). The study was done in complete randomize design that included feeding of beluga
juveniles with diets supplemented with 0 (control), 1, 2 and 5% yeast (4 treatments with 3
replicates). Beluga juveniles (11.40±0.56g) were randomly allocated in 12 oval tanks at a
density of 35 fish per tank and triplicate group were fed with experimental diets. At the end
of the trial, growth factors (final weight, weight gain, SGR, CF) as well as feed conversion
ratio (FCR), body composition (protein, lipid, ash, moisture) and intestinal microbiota (total
viable bacteria and Lactobacillus spp. levels) were determined. Our results confirmed that
juveniles fed on diet supplemented with 5% S. cerevisiae var. ellipsoideus had significantly
higher final weight, weight gain, specific growth rate (SGR) and lower food conversion ratio
compared to control and 1% treatment (P0.05). The study of body
composition showed no significant difference between treatments (P>0.05). Total viable
bacteria and Lactobacillus spp. count were significantly higher in 5% treatment compared to
control (P0.05).

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Iranian Scientific Fisheries Journal
Volume 19, Issue 4
May and June 2011
Pages 55-66

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