A Dietary Blend of Synbiotic and Organic Acids has been Demonstrated to be Beneficial for Nile Tilapia Fingerlings

Abstract Zootechnical additives are widely used in animal diets to enhance health and performance throughout different production stages. This study evaluated the effects of a blend of synbiotic and organic acids on Nile tilapia fingerlings. The investigation assessed growth performance, enzyme activity, proximate composition, and tissue histology. A total of 160 fish (initial weight: 2.22 0.06 g) were assigned to five treatments in a randomised design with four replicates for 31 days, fed a 45% crude protein diet. The blend was incorporated into the feed via oil coating (2%) at dosages of 0.0 g kg (control), 2.50, 5.00, 7.50, and 10.0 g kg . Although the blend did not affect growth performance, it modified body composition and improved physiological health indicators. Fish fed 2.50 g kg showed higher moisture and lower protein and mineral content ( P 0.05). Digestive enzyme activity increased at 5.00 g kg , whilst antioxidant enzymes (SOD and CAT) were enhanced at 7.50 and 10.0 g kg ( P 0.05). These results suggest that higher blend levels (5.00–10.0 g kg ) strengthen metabolic and antioxidant responses, highlighting the blend's potential to improve fish physiological health and support sustainable aquaculture.