Question: what is the difference between spirulina and marine phytoplankton?
Answer: Spirulina grows in freshwater, Marine Phytoplankton grows in saltwater. ... Although spirulina is often classified as a blue-green-algae it is in fact not an algae at all any more, though for many years it was considered one. Phytoplankton, on the other hand, is a microalgae found in its wild form in the ocean.