p. 153 - 167 ECOLOGIC OBSERATIONS ON THE FAUNA ASSOCIATED TO THE CYSTOSEIRA BELT ALONG THE ROMANIAN BLACK SEA COAST Victoria Tiganus Institut Roumain de Recherches Marines Constanta Abstract The data reported concern the composition, distribution and monthly variation of the invertebrate fauna associated to the alga Cystoseira barbata. Ag. along the Romanian Black Sea coast. The study was carried out during summer season, (May to November). The results were compared with the data in the literature refering to other areas of the Black Sea.