Photosynthetic picoplankton
![Picoplankton observed by epifluorescence](/Images/godic/202502/02/Picoplancton_fluorescence_Pacific0840.jpg")
![Analysis of picoplankton by flow cytometry](/Images/godic/202502/02/Picoplancton_cytometrie0840.jpg")
![Vertical distribution of picoplankton in the Pacific Ocean](/Images/godic/202502/02/Picoplankton_profile_Pacific0840.jpg")
Photosynthetic picoplankton is the fraction of the phytoplankton performing photosynthesis composed by cells between 0.2 and 2 µm (picoplankton). It is especially important in the central oligotrophic regions of the world oceans that have very low concentration of nutrients.