Along with the species Pecten jacobaeus, Venus verrucosa, Mytilus galloprovincialis and Ostrea edulis, the species Arca noae is one of the most important commercial bivalves subject to overfishing. Although much is known about the biology of the species, there is currently insufficient data on the intensity of fishing and the status of exploited populations. Therefore, the aim of this work was to determine the extent of fishing pressure on the population in Kaštela Bay in order to gather information for assessing the status of the population in this area. The length composition of individuals in the commercial catches was determined based on the proportion of individuals smaller than the minimum allowable length for hunting. In addition to describing the composition of individuals in terms of sex and size, the reproductive potential of the species and current selection pressure on individuals of a particular sex and length categories were also examined. Fifty individuals were processed for commercial capture analysis and 20 individuals were processed for reproductive potential analysis of individuals shorter than the allowed hunting length. Morphometric parameters were determined for all individuals, and the sex of each individual was determined by histological method. Selective pressure in relation to sex was recorded. Of the 50 individuals analysed from the commercial catch, 12 (24%) were male, while 38 (76%) were female. 34% of the individuals were immature (< 50 mm). 76.5% of juveniles in the catch were female, while almost the same proportion of females were in the catch of mature individuals (76%). Selection pressure on females with shell length between 50 and 60 mm was also observed. Twenty juvenile individuals ranging in length from 25.79 mm to 35.62 mm were analysed to determine the reproductive potential and length category at which individuals from Kaštela Bay become sexually active. The reproductive potential of individuals from the commercial catch and all juveniles was 100%. This study confirmed that individuals significantly shorter than the minimum allowable length for hunting have the potential to participate in spawning. However, it cautions against the potential overfishing of smaller individuals in the future, as it was found that the population is dominated by younger females.