“…A paradoxical case is the autochthonous fish species of the Iberian freshwater ecosystems: few people know that these species are endemicand therefore, unique and, moreover, they play an extremely important role in the ecosystem functioning (Macedo-Veiga, 2013;Sousa-Santos et al, 2016). Thus, if there is no greater public awareness, these ecosystems will continue to be unknown and undervalued by the citizens, who see them only as 'water reservoirs' for the satisfaction of the human needs (Angiel & Angiel, 2015). The promotion of education and environmental interpretation activities, whether or not they are part of sustainable tourism projects, can help to alter citizens' perception of freshwater ecosystems (Hvenegaard, 2017;Padrão & Tavares, 2014;Walter, 2013).…”