After sporadic appearances in previous years, the lionfish (Pterois miles) seems to have become a permanent resident of the Adriatic Sea as of 2024.
This invasive species, which we have previously reported on, has spread rapidly, as confirmed by data collected in collaboration with citizens and colleagues. The results of the lionfish’s spread, based on these data, were published in a scientific paper in the journal Acta Adriatica, issued by our Institute.
From June 2024 to January 2025, we recorded as many as 122 sightings of this species, indicating its extremely fast spread along the eastern Adriatic coast. You can see the areas with the highest number of sightings on the attached map. Interestingly, it was observed even during the winter months, in shallow bays and at relatively low temperatures. Environmental conditions in the Adriatic, at least in its central and southern parts, clearly do not present a barrier to the lionfish.
The lionfish poses an ecological risk due to its potential negative impact on native fish species. The lack of natural predators that could control its population is another important factor contributing to the success of this invasion. Aware of this threat, we dedicated part of our scientific paper to proposing mitigation measures, including potential removal, especially in marine protected areas. It is important to note that the species is edible, and targeted fishing is encouraged.
Additionally, the lionfish is venomous, and its sting can be dangerous to human health if not treated promptly.
Collaboration between citizens and experts is essential for effective monitoring and management of invasive species. Thank you to everyone who has contributed with reports so far — we hope you will continue to share your observations of lionfish and other interesting marine organisms with us!
