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Currently, China is leading the commercial mariculture of Gracilaria lemaneiformis, because of their ability of faster growth, higher environmental adaptability, water improvement and higher concentration of agar-agar.In addition to traditional uses in food and agar-mdustry, the abundant availability of cultured algae needs other potential markets.The current industrial practice of agar extraction uses sodium hypochlorite and other chemicals as bleaching agents during the extraction process in China, causing significant health hazard and environmental pollution.