Algae are economically important as sources of food, fertilizer, agar, pot­ ash, and iodine (Day et al. 1999). Production of valuable biochemicals from algae is on the rise. The successful commercial production of βcarotene as a health food from the green microalga Dunaliella and the production of phycoerythrin as a diagnostic marker (Phycofluor) from red microalgae are just two examples (Dupre et al. 1995, Jin and Melis 2003, Ben-Amotz 2004). The algae-based bio-industry is developing rap­ idly, the driving force being the trend of the market toward natural-and away from synthetic-products.