In the provinces of Guangdong, Fujian, Guangxi and Hainan in China, tilapia are stocked at 30 000-37 500 fish/ha and fed with pelleted feed (28-35 percent CP) two to three times daily at 6-10 percent body weight (BW)/day for fish . 100g, 3-6 percent BW/day for fish 100-250 g and 1.5-4 percent BW/day for fish 300-800 g (Lai and Yi, 2004).