The ocean is a wickedly challenging area to conduct scientific research. Marine fish evolve in an environment that is not readily accessible (immersed, offshore) leading to fragmented, and sometimes non-existent, knowledge of species distribution and ecology. The concept of generating digital twins of the ocean is borne from the necessity of having tools and methodologies available to support research and management activities on Europe’s seas. In this context, data and tools derived from mapping and animal tracking can support efforts aimed at facilitating modelling and simulations for fisheries management and spatial planning. Digital twins have largely focused on physical features of the oceans, especially bathymetric mapping, water circulation, and physicochemical properties; however, biological digital twins developed from animal tracking are highly promising to support management actions and key policy like the EU Common Fisheries Policy and the Marine Strategy Framework Directive.