Keywords: Calculated; Calothrix, abundance expressed in number of nifH gene copies; Calothrix, associated species; Calothrix, biological trait, ratio expressed in mass of carbon per amount of nifH gene copies; China Sea; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Diazotrophs, total biomass as carbon; Event label; FLU; Fluorescence-based quantitative real-time PCR (qPCR); Fluorometer; Heterocyst, biomass; Latitude of event; Longitude of event; MAREDAT_Diazotrophs_Collection; Richelia, abundance expressed in number of nifH gene copies; Richelia, associated species; Richelia, biological trait, ratio expressed in mass of carbon per amount of nifH gene copies; SO187/2; SO187/2_07-1; SO187/2_11-1; SO187/2_12-1; SO187/2_13-1; SO187/2_15-1; SO187/2_17-1; SO187/2_20-2; SO187/2_21-1; SO187/2_21-1a; SO187/2_29-14a; SO187/2_29-35; SO187/2_29-9; SO187/2_32-1; SO187/2_33-1; SO187/2_37-1a; SO187/2_39-1; SO187/2_44-1; SO187/2_45-1-1a; SO187/2_45-4; SO187/2_46-1; SO187/2_48-1; SO187/2_53-1a; SO187/2_54-2; Sonne; Trichodesmium, abundance expressed in number of nifH gene copies; Trichodesmium, biomass as carbon; Trichodesmium abundance, total; Unicellular cyanobacteria, biomass; Unicellular cyanobacteria-A, abundance expressed in number of nifH gene copies; Unicellular cyanobacteria-A, biological trait, ratio expressed in mass of carbon per amount of nifH gene copies; Unicellular cyanobacteria-B, abundance expressed in number of nifH gene copies; Unicellular cyanobacteria-B, biological trait, ratio expressed in mass of carbon per amount of nifH gene copies; VIETNAM