p. 227 - 233 ASPECTS BIOCHIMIQUES ET PHYSIOLOGIQUES DU CYCLE SEXUEL CHEZ Crassostreia gigas TH. ACCLIMATEE EXPERIMENTALMENT AU LITTORAL ROUMAIN LA MER NOIRE Elena Csernok et Elena Ghitescu Institut Roumain de Recherches Marines Constanta Abstract Some biochemical and physiological aspects of gametogenic cycle in Crassostrea gigas TH. growth on the Romanian Black Sea coast are presented. The changes in condition index and biochemical levels of the body components (water, ash, protein, lipid carbohydrate, aminoacids and energetic values) are directly dependent of the gametogenic cycle of the animal.During a study of the reproductive cycle of C. gigas in a brackish water environment, the changes in the biochemical composition are comparable with those for molluscs with semianual breeding cycles.