Improvement of Growth properties, Survival, hematological-humoral immunity factors and intestinal bacterial density of brown trout (Salmo trutta caspius Kessler, 1870) affected by different levels of Beta-Plus as probiotic

Effcts of Beta-plus as probiotic on growth properties, survival, hematological factors and intestinal bacterial density of brown trout were investigated. Numbers of 585 juveniles during 3 months have studied with 105±5 in weight, 15 basins with a density of 39 fish per 1,500 liters. Different level of Beta-plus were used ranged as 0, 0.5, 1, 1.5 and 2Kg per ton of food) with 3 repeats in a completely randomized design. The results showed according to adding the probiotics in feed, growth properties such as PBWI, BWf, FCR and SGR were improved (P0.05), while the probiotic reduced amounts of RBC, Hb and HTC (P