In the present study the effects of the seaweed Taonia atomaria supplementation in diets for Nile tilapia were investigated. A 12-week feeding trial was carried out using triplicate groups of Nile tilapia, Oreochromis niloticus with 1.1±0.04 g initial weight. Four experimental diets were formulated and marked as D1 (control), D2, D3, and D4. There were significant differences (P