Rainbow trout (Oncorhynchus mykiss) is a popular aquaculture species, often faces health and growth challenges due to high stocking density. To address these issues, the present study focused on evaluating impact of dietary supplementation performance rainbow using probiotics as well combined with enzymes. Four groups fry, each an average size 1.423±0.002 g, 1.412±0.096 1.451±0.136 g 1.477±0.11...