Cage farming can cause remarkable elevation of pollution level on the coastal marine environment. Studies showed that the nutrient load of the fish farm can be reduced efficiently through integrated culture of seaweeds. For example, Troell et al. (1997) found that Gracilaria chilensis co-cultured in the fish farm can remove more than 5% N and 27% P from the surrounding environment. Zhou et al. (2006) reported that Gracilaria lemaneiformis grew well in fish farming areas and that the annual C, N and P removal efficiencies of the seaweed were 2.5, 0.22 and 0.03 t ha
, respectively. The fish culture water was proven effective in supporting the growth of three carrageenophytes, and tank cultivation trails showed that 41–66% of the ammonium content of the fish farm effluent can be reduced by seaweeds (Rodrigueza and Montaño, 2007). However, only a few studies have focused on the bioremediation capacity of Sargassum cultured in the fish farm