A factorial arrangement of 6 treatments, 2 photoperiods for water spinach Ipomoea aquatica (12-h or 24-h light per day) X 3 feeding frequencies for red tilapia Oreochromis sp. (an equal daily ration evenly fed 6, 4 or 2 times at 4-h, 6-h or 12-h interval, respectively) were assigned to 12 tanks.