Effects of Histidine on growth performance, Survival, some blood parameters and amino acid profile of body composition of Beluga (Huso huso)

A 9-week feeding trial was conducted to estimate effect of Histidin as a feed attractant on growth performance, blood parameters and amino acid profile of great Sturgeon (Huso huso), One hundred and eighty juvenile great sturgeons (26.3 ± 0.98 g) were stocked in 18, 500-L polyethylene tanks (10 fish per group) in a completely randomized design trial (n=3). Fish were fed three daily meals ad libitum at 7h, 14 h and 17h, for 63 days, the best weight gain(WG), percentage weight gain (Wg%), feed conversion ratio (FCR), specific growth rate (SGR), daily growth rate (DGR), condition factor (CF), were recorded with treatment feed having Histidin 1.5 %. (p < 0.05), and phenylalanine had no significant differences between treatments (p < /em>>0.05). At the end of experiment, hematological parameters, such as red blood cell (RBC), white blood cell (WBC), hematocrit (Hct), hemoglobin (Hb) and complementary activities were determined. Results suggested that, mean and complementary activities were determined (MCV), mean corpuscular hemoglobin (MCH) mean corpuscular hemoglobin concentration (MCHC) had no significant differences between treatments. Results indicated that Histidin had no significant effects on some hematological parameters in beluga, also the results showed that survival rate of fish fed with diets containing Histidine had significant difference between treatments and amino acid profile of body composition had no significant differences between treatments (P>0.05).