The Adriatic Sea is not known for not having a significant presence of large shark species. The reason behind the sea's relatively shallow depth, limited access to the open ocean, and lower salinity make it less suitable for many shark species. However, there have been occasional sightings of smaller shark species in the Adriatic Sea. It's important to note that shark encounters in the Adriatic Sea are rare, and the presence of sharks does not pose a significant threat to swimmers or beachgoers.