p. 63 - 84 DONNES NOUVELLES CONCERNANT LES DEVELOPPMENTS MASSIF DES ESPECES PHYTOPLANCTONIQUES ET DEROULEMENT DES PHENOMERNAS DE FLORAISON DE L'EAU DU LITTORAL ROUMAIN DE LA MER NOIRE N. Bodeanu Institut Roumain de Recherches Marines Constanta Abstract The work includes data concerning the total quantities of phytoplankton, the levels of development of the main species of the plankton algal flora and the blooming phenomena in the waters of the Romanian shore of the Black Sea from 1983 to 1984. There are presented the blooming conditions, nothing some decreases of the proportions of these phenomena and of the phytoplankton biomass in 1983-1984.