p. 39 - 54 MODIFICATIONS SURVENUES DANS LA DYNAMIQUE DE L'OXIGENE DES EAUX MARINES LITTORALES ROUMAINES Adriana Cociasu, Lucia Popa et Liliana Dorogan Institut Roumain de Recherches Marines Constanta Abstract The paper presents the quantitative changes of the oxygen dynamics from May to September begining with 1969 year. A special attention is paid to the oxygen deficit, a phenomenom which regularly appears in summer begining in 1975, in the water near the bottom on an offshore area up to 20 Nm.