The 21st edition of the AZTI Summer School took place from 3–5 June 2025 at the Aquarium of San Sebastián, gathering scientists and early-career researchers to explore the role of artificial intelligence and citizen science in monitoring and assessing marine biodiversity and invasive species.

Organised in collaboration with six Horizon Europe projects — GES4SEAS, OBAMA-NEXT, GuardIAS, BioBoost+, ANERIS, and POMP — this year’s programme featured both theoretical and practical sessions on cutting-edge methods for supporting European ocean policies such as the Marine Strategy Framework Directive and the Biodiversity Strategy.

The GES4SEAS project was prominently represented throughout the agenda. Angel Borja, project coordinator, opened the Summer School and led the final session reflecting on the lessons learned. Stelios Katsanevakis (University of the Aegean) and Heliana Teixeira (University of Aveiro) delivered a two-part session on the CIMPAL+ tool, focusing on its application in assessing the cumulative impact of invasive alien species. The tool, part of the GES4SEAS toolbox, sparked lively discussions around its practical use for supporting ecosystem-based management.

Participants also had the opportunity to engage in hands-on activities including practising citizen science methodologies inside the San Sebastián Aquarium.

As the school concluded, participants emphasised the need for continued collaboration between projects and institutions to advance ocean observation and ensure that science remains a strong pillar for marine governance.

Thank you to all the students and professors for joining us at this year edition of AZTI Summer School, and making it yet another success.