BACKGROUND: Probiotics, in form of microbial supplements, are known to be a suitable alternative for antibiotics and can affect the health indicators of host. Objectives: The present study was conducted to assess the combined effects of dietary autochthonous Saccharomyces cerevisiae and Aspergillus niger on haematological and serumbiochemicalparameters of beluga sturgeon (Huso huso) juveniles. Methods: This study was based on a completely randomized design with 4 treatments and 3 replicates on beluga juveniles with average weight of (mean ±SE) 31.8±2.81g. Beluga Juveniles were divided randomly into 12 fiber glassy tanks with density of 30 fish per tank and were fed with diet contain dietary probiotic with density of 2×106 (Cells/g) for the first treatment, 4×106 (Cells/g) for the second treatment, 6×106 (Cells/g) for the third treatment and basal diet without probiotic for the control group for 8 weeks. Results: Diet supplementing with concentration of 6×106 (Cells/g), significantly improved serum biochemical parameters (p<0.05), however hematological parameters were affected by supplemented diet with probiotics that showed no significant difference in comparison with the control group (p>0.05). Also results indicate that growth factors were improved in experimental treatments in comparison with the control group. Conclusions: The results showed that the use of combination of these species with studied concentrations can improve the performance of some biochemical parameters such metabolites factors, immune, enzymes and serum electrolytes of belugajuveniles. It is recommended that the concentration of A. niger and S. cerevisiae, used for third treatment be used as an immune stimulator for beluga juveniles.

The activity of the cellulase enzyme and the content of phytoestrogen (genistein) forming is determined during the fermentation of soybean waste with Aspergullus niger. The analysis is performed at fermentation incubation time of 0, 48, 96, 144 and 192 hours and treatment with addition of micro nutrient (V2) and without micro nutrient (V1). Data analysis on cellulase enzyme activity on phytoestrogen forming material is performed using T test. The average of cellulase content of fermented soybean waste increases from 0.032-0.139 IU / ml (V1) and 0.061-0.158 IU / ml (V2) after 48 hours into 0.238 IU / ml (V1) and 0.245 IU / ml (V2) after 192 hours The average of genestein levels in the fermented soybean waste increases as well from 0.101 - 0.573 mg / g (V1) and 0.114 - 0.587 mg / g (V2) after 48 hours and increase into 0.722 mg / g (V1) and 0.699 mg / g (V2) after 192 hours. Statistical analysis indicates that the treatment of V1 and V2 has an effect on the increase of cellulase enzyme content and genistein level (P 0.05). The correlation between enzyme activity of cellulase and genistein on soybean waste fermented with Aspergillus niger is significant (R2 = 0,949). The relationship between the enzyme performance and its formation material is running synergistic, cellulase enzyme activity and genistein level experience significant increase during the fermentation process.