Spirulina (Arthrospira) is a filamentous cyanobacterium that is grown commercially for food and feed and as a food coloring and additive. Currently there are many companies producing Spirulina in different countries to the tune of 3000 tons a year. This paper attempts to describe the problems of mass culture of Spirulina, deriving information from two commercial facilities: Siam Algae Company (Thailand) and Earthrise Farms (U.S.A.).
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