On 15 and 16 June 2017, more than 70 data enthusiasts came to Heraklion, Crete, to participate in the RDA Europe-BlueBRIDGE datathon for fisheries and aquaculture. The event was kindly hosted by the Institute of Marine Biology, Biotechnology and Aquaculture of the Hellenic Centre for Marine Research (IMBBC/HCMR) and allowed participants to brainstorm on three main challenges: i) Developing a holistic approach to spatial planning for marine protected areas based on knowledge transfer and integration; ii) Assessing new fisheries and aquaculture activities and mainstreaming environmental and socio-economic indicators; iii) Incorporating socio-economic and environmental data in aquaculture assessment, strategic planning and performance analysis. After a first introductory session chaired by Yannis Ioannidis, President and Gen. Director, Athena RIC, and Professor of Informatics at the National and Kapodistrian University of Athens, six initiatives, including EMODnet, the RDA Geospatial Interest Group and Fisheries Data Interoperability Working Group, LifeWatchGreece, the PHYSIS project and BlueBRIDGE presented their tools and datasets...