The scallop Flexopecten glaber ponticus (Bucquoy, Dautzenberg & Dollfus, 1889), which is endemic to the Black Sea, can be classified as a mollusk species potentially cultivable in the coastal waters of Crimea. Recent data indicate emerging trends in the scallop population recovery off the Crimean coast. The scallop settles in large quantities into nursery cages together with the giant oyster Crassostrea gigas (Thunberg, 1793), which suggests the scallop can be reared in suspended culture due to its availability and ease of collection. We studied the seasonal dynamics of allometric growth and weight increase of the Black Sea scallop F. glaber ponticus during cage farming off the coast of Crimea. For the first time, a growth model is presented that adequately describes the linear growth of the mollusk. The linear relationship between shell height and age of the scallop and the exponential relationship between the total live weight and shell height were found. It was shown that the commercial quality indices of F. glaber ponticus - meat yield, condition index and gonadosomatic index - vary with season. The maximum values of the condition index and meat yield were noted in April, 63.40 and 33.01%, respectively. The gonadosomatic index increased from January to June (from 6.8 to 13.14%) and decreased from July to November, which trends are associated with the gametogenesis and spawning of the mollusk. The percentage of dry matter in soft tissues was 16.5%. We propose the cultivation duration (2.5-3 years) and optimal timing for harvesting marketable Black Sea scallop as a promising mariculture species. Winter and spring can be the best period for collection of the Black Sea scallop of marketable size.