Artificial reefs are increasingly used to preserve and enhance biodiversity in marine ecosystems. A four-year study conducted on an artificial reef in the Zadar Channel aimed to assess its impact on the occurrence of marine organisms, particularly fish communities and benthic organisms. Research methods included monitoring fish and benthic organisms over multiple seasons, with collected data compared to the results of other studies. The BRUV method was used to document fish communities, while benthic organisms were monitored visually and through video recordings. The results indicate a gradual increase in fish species, such as Diplodus vulgaris and Pagellus acarne, with a pronounced rise in the early years following the reef's deployment. However, a decline in the abundance of commercially significant species, such as the poor cod (Trisopterus minutus) and the common two-banded seabream (Diplodus vulgaris), was observed in the later stages of the study, attributed to fishing pressure. The development of certain benthic organisms, such as mussels (Mytilus galloprovincialis), tube worms (Protula sp.), and sea cucumbers (Holothuria tubulosa), points to the stabilization of the ecosystem despite challenging environmental conditions. It was concluded that the artificial reef contributes to the preservation of marine biodiversity at the installation site, but additional management measures for fishing resources and continued monitoring are needed.