The study of growth indexes and hematological parameters of rainbow trout (Oncorhynchus mykiss) larvae fed supplemented diet with Bifidobacter probiotic

Evaluation of probiotic is not summarized on growth but included the other aspects, such as blood parameters. In this study, effects of two bifidobacter, Bifidobacterium animalis and Bifidobacterium lactis with three concentrations of 1× 109 (T1), 2× 109 (T2) and 3× 109 (T2) CFU/100g were studied on growth performance and hematological parameters of rainbow trout larvae with initial body weight of 0.538 ± 0.197 g. Thus 3 experimental treatments and a control, each with three replicates were prepared. Thirty rainbow trout larvae were stocked in each replicate. The larvae were fed 4 times a day according to 4-8% of body weight. After 8 weeks of feeding trail with supplemented diet with Bifidobacterium growth and hematological parameters were studied. The result of hemoglobin showed no significant difference between experimental treatments and the control (P>0.05). The use of Bifidobacter caused increase of red and white blood cells in T3 and T2 treatments (P<0.05). However no significant difference was observed in MCV and MCH (P>0.05). The study of hematological parameters, final weight and specific growth rate in present study showed that the use of bifidobacter increased blood cell account and also the final weight growth in rainbow trout.