A 56-day feeding trial was conducted with Oreochromis niloticus (Tilapia) fingerlings fed soybean boiled at different periods. The period treatment variations were unboiled soybean as control (T₁); soybean seeds boiled for 20 minutes (T₂); 30 minutes (T₃); 40 minutes (T₄) and for 50 minutes (T₅). The soybean seeds so treated were sun dried, milled and were used to formulate iso-nitrogenous diets (25% crude protein). The trials were conducted in hapas of 1m³ submerged in a pond. The diets were fed at 5% body weight and each hapa was stocked with 20 fingerlings. Evaluation of growth parameters and nutrient utilization of fish fed the experimental diets was based on mean weight gain (MWG); specific growth rate (SGR); protein efficiency ratio (PER); food conversion ratio (FCR) and survival rate. There was significant difference (P