Seaweed grows very quickly and can be harvested more than four crops per year compared to the crop and forest-derived bio- mass which are harvested less than two crops and one crop per year respectively (Table 1). Globally, about 7 million tons (wet weight) of macroalgae is harvested in 2008, and the most har-vested species are Laminaria japonica
(sea tangle), Undaria pinnatif-iida(sea mustard), and Porphyra tenera(sea weed laver) (FAO,2011). According to the ‘‘Food and Agricultural Organization stats’’, the highest production of cultured seaweed throughout the worldin 2008 was the brown seaweed, especially L. japonica which was 4.8 million tons per year. Among them, L. japonica and U. pinnatif-iida were brown algae and L. japonica was accounted for about 65% of global production. In the case of South Korea, the two most cul-tured species occupying around 70% of total aquaculture produc- tion are L. japonica and U. pinnatifiida. In our previous research, the composition of L. japonica had been analyzed. As the data shown in Table 2
, the amount of carbohydrate of L. japonica is higher than that of U. pinnatifiida, which contains 60–67% (W/W dry). However, U. pinnatifiida has more protein (Cho et al., 1995).