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The effect of the Primalac probiotic at four levels of 0, 0.05, 0.1 and 0.15% on GROWTH performance, BLOOD biochemical parameters, survival and resistance to salinity stress in common carp fingerlings (2.67±0.117 g) was assessed for a period of 45 days. Primalac enhanced GROWTH performance and significantly decreased the FCR (p< 0.05). Primalac also decreased the glucose levels and increased the to talprotein level, but the differences among treatments were not significant (p> 0.05). Primalac significantly decreased the cholesterol levels (p< 0.05). Salinity stress test was carried out after 45 days of feeding. BLOOD samples were taken four times after stress (first, third, fifth and seventh days) to evaluate hematocrit levels. On the firstday, the hematocrit levels increased significantly in all groups (p< 0.05), but it decreased gradually in all groups after the third day. Before and after the stress, no differences were observed for survival rate among the treatments (p> 0.05). These results indicate that addition of Primalac to fish diet exerted positive effects on GROWTH, biochemical indices and reduce stress in common carp.