The growth trial was conducted in an indoor system at National Taiwan Ocean University (NTOU). The genetically improved farmed hybrid tilapia strain of O. niloticus x O. aureus was developed by Taiwan Fisheries Research Center (TFRC) from the selective breeding of stocks. Fry hybrid tilapia (O. niloticus x O. aureus) were obtained from a fish farm in Tainan, Taiwan; and acclimatized in the laboratory conditions for one week in brackish water (15 ppt). At the beginning of the experiment 15 glass tanks 60 x 30 x 38 cm containers (36 L) were stocked with 10 fishes each with an average of 1.54 ± 0.03 g. Each aquarium was put in a closed recirculating system maintained at 30 ± 1°C. An air stone continuously aerated each aquarium. All aquaria were cleaned daily in the morning and the afternoon by siphoning off accumulated waste materials. Approximately half of water in each tank was replaced with aerated brackish water twice a day. The fish were fed with 6% of body weight per day and gradually decreased to 4% daily. Each diet was fed twice daily at 08:00 h and 17:00 h for 60 days to triplicate group