Effects of bactocell probiotic and galactooligosaccharide peribiotic on the growth, survival, blood parameters and resistance to salinity stress in tree-spot gourami (Trichogaster trichopterus)

The aim of this study was to evaluate the effect of commercial probiotic (Bactocell) and prebiotic (galactooligosaccharide) on the growth, survival, blood parameters and resistance to salinity stress in tree-spot gourami. Seven hundred and twenty fish were randomly divided into 12 groups with three replicates. The fish in the first group (control) were fed with commercial pelleted diet. The other five groups were fed with 0.1 gr/kg probiotic, 0.2 gr/kg probiotic, 0.4 gr/kg probiotic, 1% prebiotic, 2% prebiotic, 0.1 gr/kg probiotic and 1% prebiotic, 0.1 gr/kg probiotic and 2% prebiotic, 0.2 gr/kg probiotic and 1% prebiotic, 0.2 gr/kg probiotic and 2% prebiotic, 0.4 gr/kg probiotic and 1% prebiotic, 0.4 gr/kg probiotic and 2% prebiotic, for 90 days, respectively. Growth parameters, survival rate, blood parameters and resistance to salinity stress were evaluated on the end of the trial. Seventh treatment showed significant improvements (p<0.05) in terms of growth parameters and feed utilization (p<0.05). Also, between blood parameters, eighth treatment had a significant increase compared to the control group in total protein (p<0.05), but treatments fed with peribiotic (alone) (fifth and sixth groups) showed significant increase (p<0.05) in resistance to salinity stress compared to the control group. Overall. The results showed that bactocell probiotic and galactooligosaccharide peribiotic (In combination) Cause improvement in growth parameters and blood total protein, and galactooligosaccharide peribiotic (alone) Cause improvement in resistance to stress in tree-spot gourami.