International agreements about the management of marine resources highlight the need to achieve sustainable development of marine activities through the sustainable use of marine resources, amongst others. Taking this into consideration, the European Commission expresses in the Green Paper on Marine Policy of the EU the need for a comprehensive marine policy aimed at developing an efficient and environmentally sustainable economy, stimulating growth and social welfare, including the creation of new and more skilled job positions. To achieve this goal, it is considered not only necessary to properly conserve living marine resources, but also to maintain and improve the state of the resource in question and the ocean itself. These needs imply a clear move towards an ecosystem-based management based on scientific knowledge. The Marine Strategy Framework Directive establishes the need to reach a satisfactory environmental state of the seas by promoting its sustainable use and protecting the marine ecosystems, given that the marine environment is a valuable heritage that needs to be protected, preserved and, when possible, rehabilitated, with the goal of maintaining biodiversity and preserving the functioning of marine ecosystems.