p. 5 - 13 OBSERVATIONS SUR LA TENEUR DES EAUX MARINES DE LA ZONE CONSTANTZA DANS LA PERIODE 1966-1972 Adriana Cociasu Institut Roumain de Recherches Marines Constantza Abstract The resort which is based on a great number of measurements, leads to some conclusions concerning the seasonal oxygen vertical distribution in the sea water along the Romanian coast, as well as the causes of its variation.