This study aimed to investigate the effects of sumac (Rhus coriaria L.) fruit powder in different concentrations as feed additives on non-specific immune response, hematology, and disease resistance rainbow trout (Oncorhynchus mykiss). Fish (35.67±0.88 g) were fed with experimental diets (1.0, 3.0, 5.0 10.0 g kg-1) at four concentration. There no significant differences between groups control g...