In this thesis the analysis of statolith microstructure was used to determine the age of the banded murex Hexaplex trunculus (Linnaeus, 1758) (Gastropoda: Muricidae) in the eastern central Adriatic. Statocysts are saccular structures, key organs for balance in mollusks, and within them are hard calcareous structures called statoliths that are useful for direct assessment of the age structure of the studied population. During this research 91 individuals were sampled, with shell length (SL) range from 37.53 to 96.51 mm, the body weight between 6.34 and 95.04 g and statolith diameter (SD) range from 0.23 mm to 0.39 mm. The estimated age of whelks ranged from 3 to 8 years (N = 81). The length-weight relationship showed positive allometric growth for males (b = 3.1), while negative allometric growth was recorded for females (b = 2.9). No statistically significant difference was found between males and females in the length of the shell, nor in body weight, spire length and width, nor in the total length of the aperture, the length of the aperture or the length of the siphonal canal. All of the above indicates that there is no secondary sexual dimorphism in the whelks. The results of this work can be used for further research into the age structure of the adriatic banded murex.