4 Discussion
in the first four weeks of the present study, the zootechnical performance was not noteworthy affected by probiotics However However, significant improvements of growth and feed con- version parameters were observed in the fish fed both probiotics types after s weeks of feeding. The mult-species probiotic blend improved DGL FOR and PER only at the lowest dose tested(A) A higher CHU dosage(Ar) could imply a higher disturbance in Gl microbiota ar immune stimulation with energy and nutrient wastage 161k Pediococcas acidilactici at the highest dose tested(B2) improved FCR and PER. Proteolytic and hypolytic activities of Pacidilacnci strains L62.631 could contribute to explain the higher feed efficiency observed in animals fed R2 diet, given the significant lower nutrent intake with a similar or superior nutrient retention, comparing to control group. Previous studies, using superior