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The main objective of the present research was to investigate the impacts of commercial immunostimulants on growth, non-specific immune response, antioxidant enzymes, and intestinal morphometry of Nile tilapia,  Oreochromis niloticus . Fish (100 ± 6.5 g) were randomly divided into five groups in triplicates (150 fish in each replicate), stocked in 20 m 2  of aerated concrete ponds. The fish were fed on a control diet (30.0% crude protein) (control), and four experimental diets supplemented with Yeast Plus ® , Digestarom ® , and Biotronic ®  Top 3  at 1 kg ton –1 , and Sanolife PRO-F ®  at 0.5 kg ton –1 . After the experimental period, the highest significant yield (kg m –3 ), mean final weight (g fish –1 ), average weight gain (g fish –1 ), and specific growth rate (% body weight day –1 ), were recorded in fish fed on the diet supplemented by Sanolife PRO-F, followed by Yeast Plus ponds. The lowest yield was recorded in the control group. However, the feed conversion ratio was significantly decreased with Sanolife PRO-F diet. Furthermore, the hematological analysis increased in the following ascending order: Sanolife PRO-F ® ; Yeast Plus ® ; Biotronic ®  Top3 and finally Digestarom ®  groups. The lowest concentrations of white blood cells, red blood cells, hematocrite, and hemoglobin ( P  ≤ 0.05) were observed in the control group. The levels of phagocytic activity and phagocytic index were significantly higher in fish fed with Sanolife PRO-F ®  group ( P  ≤ 0.05). Likewise, serum lysozyme activity was significantly highest in Sanolife PRO-F (0.63 and 0.68 U/mL, after 0.5 min and 3 min, respectively). Levels of total serum proteins, globulin, Immunoglobulin M, catalase, and super oxide dismutase were significantly higher in fish fed with Sanolife PRO-F ®  supplement. On the contrary, length measurement of the intestinal villus height/width, absorption area, crypt depth, and goblet cells, were significantly lower in the control group, whereas their highest values was observed in fish fed Sanolife PRO-F ( P  ≤ 0.05). Consequently, Sanolife PRO-F ®  is recommended at a level of 0.5 kg ton –1 , to improve the growth performance, antioxidative capacity, and immune response of Nile tilapia.

frontiers in physiology

The Immunostimulatory Effects of Commercial Feed Additives on Growth Performance, Non-specific Immune Response, Antioxidants Assay, and Intestinal Morphometry of Nile tilapia, Oreochromis niloticus