Marine Phytoplankton WHAT IS MARINE PHYTOPLANKTON? Did you know that marine phytoplankton is considered to be the most important plant in the world, serving as a vital food supply for both marine and human life? Indeed, marine phytoplankton, also known as microalgae, are unique and highly nutritious microscopic plants. https://www.nationalnutrition.ca/greens/marine-phytoplankton.html #MarinePhytoplankton