p. 143 - 153 MODIFICATIONS D'ICHTYOFAUNE DANS LA LAGUNE SINOE Valerian Udrea Institute Roumain de Recherches Marines Constanta Abstract The ichtyofauna structure, based on the results of experimental fishing performed in the Sinoe lake from May to October 1977, in the specific conditions of salinity is presented. In high salinity conditions the disappearance of some species like sheat fish (Silurus glanis), pike (Esox lucius), bream (Abramis brama danubii) takes place. Blue fish (Pomatomus saltratix) has appeared besides the other euryhaline species.