The 5th International Congress on Applied Ichthyology, Oceanography, and Aquatic Environment (HydroMediT 2024) will take place in Mytilene (Greece), at the hospitable island of Lesvos, from the 30th of May to the 2nd of June 2024, in the premises of the University of the Aegean. The event is organized within the framework of the AII Greek Chairmanship.