عنوان مقاله [English]
A study to determine the effect of varying dietary prebiotic Immunogen levels on the growth performance, hematological parameters and intestinal microbial balance of (Acipenser persicus), was carried out. The commercial prebiotic, Immunogen, were mixed thoroughly with the artificial feeds at concentration of 0.0 (control), 0.5, 1 and 2 g kg-1 dry diet and fed to healthy fish (27±0.45 g) at 2 - 3.5 % of their body weight daily in two split doses for 8 weeks. The trail was carried out in 12PVC tanks 500 liter which was filled with about 200 liter of water. That all tanks 12 juvenile Persian sturgeon were stocked. During the experimental period, weight and length of fish were recorded at an interval of 14 days. We studied also hematological parameters and intestinal microbial balance of fish at the end of the experiment. Results showed that specific growth rate (SGR), food conversion ratio (FCR), feed efficiency (FE), body weight gain (BW %) and net production (NP) were significantly (P<0.05) different among the experimental groups. no significant difference were observed in body composition (P>0.05). There were no significant differences (P>0.05) in the haematocrite, hemoglobin, total protein, glucose, albumin and globulin among the treatments. Results also showed that white blood cell (WBC), cholesterol and cortisol levels were significantly (P<0.05) different among the experimental groups. In addition, microbial analysis showed that colony forming units (CFU) and intestine Lactobasilus were significantly (P<0.05) different between control and other experimental groups.