Definition of "microalga" []

• Any of many microscopic photosynthetic protists, often living as single cells and floating as plankton. (noun)

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• "The most abundant source of astaxanthin in nature is the single-cell microalga Haematococcus pluvialis, which accumulates astaxanthin in lipid (fat) vesicles (small, anatomically normal sac- or bladderlike structures) during periods of nutrient deficiency and environmental stress."
• "Astaxanthin serves the same purpose for all life forms as it moves up the food chain from a single-celled microalga to krill to salmon to human."
• "This astaxanthin-producing microalga is naturally found in arctic marine environments as well as freshwater rock pools all over the world."