Document Type : Research Paper
MSc Department of Fisheries, Gillan Science and Research Branch, Islamic Azad University, Rasht, Iran
Associate Prof. Department of Fisheries, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran
Assistant Prof. Department of Fisheries, Lahijan Branch, Islamic Azad University, Lahijan, Iran
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 (P<0.05). In addition, fish fed with 1.5Kg/T Beta-plus showed best performance in Caspian Sea Brown trout in comparison to other treatments. Parameter of WBC had not any different among blood parameters (P>0.05), while the probiotic reduced amounts of RBC, Hb and HTC (P<0.05). Also, microflore bacteria counts were increased due to Beta-plus (P<0.05) statistically, but there was no different in Immunoglobin M (IgM) between treatments, as a humoral immunity parameter. Thus, supplement of Beta-plus intruduced as a growth stimulator in culture of Caspian Sea salmonid fish.