To clarify for other readers... The point about "Schizochytrium is not algae" is that they do not photosynthesize and thus don't create sugars from CO2. Rather,

To clarify for other readers... The point about "Schizochytrium is not algae" is that they do not photosynthesize and thus don't create sugars from CO2. Rather, this organism is a heterotroph and consumes various organic molecules from its environment. Industrial cultures are fed simple sugars and nitrogen sources, plus waste products like spent brewery yeast, cheese whey, and molasses.