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A study of the age, growth and population structure of Acanthocardia tuberculata from the eastern Adriatic  Sea was carried out. The condition index analysis identified one reproductive peak, which occurred between April and  May, for a population of A. tuberculata in the Cetina River estuary with uni-modal recruitment. Annual growth rings on the  external shell surface consisted of a dark ring deposited during the summer-autumn period and a light ring deposited during  winter-spring. This was validated by acetate peels of shell sections and marginal increment analysis. Shell lengths of aged  specimens ranged from 19.7 to 62.9 mm (mean = 41.21±8.96 mm). Estimated ages ranged from 5 months to 11 years, with  mean values of 2.1, 2.4 and 3.1 years for Rab Island, Pag Bay and the Cetina River estuary respectively. Shell deposition is  fastest during the first two years of life and significantly decreases after the 4th year. The growth parameters L∞ and k were  estimated using the Gulland-Holt method and by fitting length at age data to a von Bertalanffy growth curve. Values of L∞  ranged from 52.6 mm (Rab Island) to 59.7 mm (Pag Bay). The growth constant k showed greater variations (0.49 to 0.77  year-1), while growth performance index values (ø’) ranged from 3.13 to 3.36

Age, growth and population structure of <i>Acanthocardia tuberculata</i> (Bivalvia: Cardiidae) in the eastern Adriatic Sea