Greek Shark Logbook 2025

The Greek Shark Logbook 2025 is a citizen science dataset documenting shark sightings and encounters in Greek marine waters during the year 2025. The dataset compiles georeferenced records submitted by fishers, divers, researchers, and the general public, which were reviewed and validated before publication. It provides species occurrence information with basic biological and contextual details and is openly available through figshare.

The dataset aims to improve knowledge of shark distribution and seasonal presence in the Aegean and Ionian Seas and to support marine biodiversity monitoring and conservation efforts. Records include the date and approximate location of sightings, species identification where possible, and notes on the type of encounter, such as free-swimming individuals or incidental captures. Some records also include estimates of size, sex, or behaviour and supporting photographic evidence.

Greek Shark Logbook 2025 contributes occurrence-level biodiversity data that can support EMODnet objectives by filling data gaps for elasmobranch species in the Mediterranean. The dataset can be used for spatial analysis, temporal trend assessment, and as supporting evidence for conservation planning and ecosystem-based management.