The Tagus estuary, Portugal, is an ecologically and socioeconomically important ecosystem that has consistently been affected by anthropogenic stressors. It is home to five species of Syngnathids, but little is known about them. This study aimed to investigate the local community’s perceptions and interests in the natural assets of the Tagus estuary, with a particular focus on the potential of seahorses as flagship species. In-person and online interviews were conducted to assess participants’ Local Ecological Knowledge about the local estuarine environment and the seahorse population. Most participants were aware of the presence of seahorses in the local ecosystem and sightings were reported throughout the study area. This, together with a positive perception of these animals, indicates the potential of seahorses as a flagship group for Tagus estuary conservation. This study identified conservation priorities, highlighting urgent measures to protect seahorse populations, ecologically important habitats within the Tagus estuary, and local traditional activities.
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