comparative effects of three commercial probiotics on immunological parameters of common carp (cyprinus carpio)

The aim of this study was to evaluate the effects of three commercial probiotics (bio-aqua®, bio-aqua pond®, and multi behsil 100) on immunological parameters of common carp fingerlings. for this purpose, 210 common carp fingerlings (with a mean weight: 9.6±0.02 g and mean length: 12.9±0.32 cm) randomly divided into seven treatments control: basic diet without probiotics, treatment 1: 0.2 g of bio-aqua®, treatment 2: 0.1 g of bio-aqua®, treatment 3: 0.002 g/l of bio-aqua pond® dissolved in tank water, treatment 4: 0.001 g/l bio-aqua pond® dissolved in tank water, treatment 5: 0.2 g of multi behsil 100, and treatment 6: 0.1 g of probiotic multi behsil 100) in triplicates. the commercial probiotics added to the commercial diet, and the fishes fed based on 3% biomass for 60 days. based on the results, the use of probiotics bio-aqua® and multibehsil 100 caused positive effects on the immunological parameters of common carp. there was a significant difference in serum complement activity (ach50) in all treatments compared to the control group (p<0.05). there was no significant difference in the reduction activity of nbt in the blood serum in treatments 3 and 4 (bio-aqua pond treatments) with the control treatment (p<0.05). there was a significant difference in blood serum globulin between treatments 4, 5 and 6 with the control treatment (p<0.05). the highest level of lysozyme activity was observed in the sixth treatment also, the highest bactericidal activity was observed in the control group (107.1±6.45). the use of multibehsil 100, caused positive effects on common carp. the best performance on immunological parameters was seen in the diet containing probiotic multi behsil 100 (0.1 g/kg and 0.2 g/kg).