Protocol to fix marine samples for flow cytometry analysis of phtoplankton and bacteria with SYBR-Green. Fix at least 2 samples per depth sampled and at least 6 to 10 depths per vertical profileReferenceMarie, D., Rigaut-Jalabert, F. & Vaulot, D. (2014). An improved protocol for flow cytometry analysis of phytoplankton cultures and natural samples. Cytometry. 85. p.pp. 962\u2013968.