Beneficial effects of killed Tsukamurella inchonensis on rainbow trout (Oncorhynchus mykiss) growth, intestinal histology, immunological, and biochemical parameters.

Present study was conducted to investigate the effects of heat-killed Tsukamurella inchonensis on growth performance, gastrointestinal structure, immune response, and biochemical parameters in rainbow trout. Fish (mean weight 25 g) were fed basal diet (control), diets containing 2.48 × 10 colony-forming units (low-dose group) or 1.