AACF Updates Photo-ID and Acoustic Data on Atlantic humpback dolphin
The African Aquatic Conservation Fund conducted its sixth field survey in the Saloum Delta to update knowledge on the critically endangered Atlantic humpback dolphin, Sousa teuszii. The mission involved AACF staff members Diana Seck and Clinton Fatcheu, together with Charlie Hargrave from the University of St. Andrews for acoustics, and supported by our experienced, long-term boat driver, Demba Dia. The objectives of the October survey were to collect new photo-identification images, document group composition and movement patterns, and gather acoustic recordings to complement visual observations.
During the survey, the team spent 64 hours on the water and covered a total of 783 km across previously identified dolphin habitats in the delta. Over two weeks, they recorded 12 sightings of Sousa teuszii, documenting a range of group sizes and behaviours. High-quality photographs were taken to update the existing long-term photo-ID catalogue, enabling researchers to track individual dolphins over time and better understand their spatial use of the delta. In addition to the visual data, the team collected acoustic recordings that will support future analyses on vocalisations, group interactions, and habitat use, essential components for long-term species monitoring.
AACF team in the field.
This survey highlights the importance of regular, dedicated surveys for a species whose conservation status remains of significant concern. The new data help strengthen ongoing efforts to map distribution patterns, assess population trends, and identify potential conservation priorities within the Saloum Delta, an area known to host what is suspected to be the largest remaining population of Sousa teuszii.
Reflecting on the experience, one participant noted: “It’s always incredible to see these dolphins up close and to add more individuals to our long-term photo-ID catalogue. Every survey brings new insights and strengthens our understanding of this rare species.”
Overall, the survey reinforces AACF’s commitment to long-term monitoring and research, contributing valuable knowledge to support the conservation of Sousa teuszii in Senegal and the wider West African region.