Dunaliella salina (Chlorophyta) and similar hypersaline strains have biflagellated, pear shaped cells. They lack a rigid polysaccharide cell wall, having instead a thin elastic plasma membrane. Dunaliella produces ft carotene in high amounts, up to 12% of dry matter. This micro alga is a natural source of carotenoids for some shrimps. The high content of ft carotene also makes Dunaliella attractive to biotechnologists for large scale production in high salt, nitrogen deficient, inorganic media in shal low, open ponds under high solar radiation (>30 °C). Natural ft carotene is marketed in various forms: ft carotene extracts, Dunaliella powder for human use, and dried Dunaliella for feed coloration. In the cells, ft carotene is usually accompanied by other carotenoids (lutein, neoxanthin, zeaxanthin, violaxanthin, and cryptoxanthin).

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