Growth parameters were significantly higher in 4 g kg− 1 and 6 g kg− 1 Azomite diets.
Phagocytic activity significantly increased with 4 g kg− 1 and 6 g kg− 1 Azomite diets on weeks 2 and 4.
Respiratory burst activity was significantly enhanced with any supplementation diet on weeks 2 and 4.
Lysozyme activity significantly increased when infected fish were fed with 4 g kg− 1 and 6 g kg− 1 Azomite diets from weeks 1 to 4.
Cumulative mortality was low in fish fed with 4.0 g kg− 1 and 6.0 g kg− 1diets (10% and 15%) than with 2.0 g kg− 1 diet (20%).