Thanks to the tool that the already created MARCET Network represents, the harmonization of work protocols and their integration to protect and conserve the cetacean populations of Macaronesia from a multidisciplinary point of view, as well as the knowledge acquired about the current situation of the tourism sector associated with the observation activity of these species in the region, this new initiative, the MARCET II Project, was born with the aim of increasing the value of mentioned activity as a model of sustainable economic development in the Macaronesian archipelagos (Azores, Madeira, Canary Islands and Cape Verde), thus promoting the ecotourism market niche that this activity entails, and, at the same time, establishing sustainability criteria applied to the resident cetacean species that serve as tourist attractions.