The first authenticated record of Pygmy Killer Whale ( Feresa attenuata Gray 1874) in Mozambique; has it been previously overlooked?

摘要

Background The cetacean fauna of the poorly-studied waters off eastern Africa is still being described. Information on the cetacean species occurring in specific range states is important for understanding their geographical distribution ranges and for implementing national and international conservation and management measures. This report presents the first authenticated record of the Pygmy killer whale in Mozambican waters and the first record on the eastern coast of southern Africa since 1970. Methods As a part of regular informal surveys for birds and other marine life from Maputo, Mozambique, three Pygmy killer whales were seen, approached and photographed north of Inhaca Island (25°52′54.22″S 33° 8′33.62″E), on 23 April 2017. Results The animals were seen interacting on the surface for 35 min, travelling at ca. 1?km/h along the shelf edge in water 235?m deep. All three animals had been overlooked by the authors earlier in the day, misidentified as Spinner dolphins ( Stenella longirostris ). Conclusion This is the first authenticated record of Pygmy killer whale in Mozambican waters and the first recent record on the eastern coast of southern Africa since 1970, emphasising the lack of knowledge of offshore marine biodiversity in Mozambique. Previous reported records of the species in Mozambique lie outside Mozambique Exclusive Economic Zones or lack evidence. The species should be included in relevant conservation planning. Available identification material focusses on the separation of this species from Melon-headed whale ( Peponocephala electra ) and fails to note the great similarities of this species with smaller dolphins. At-sea observers are encouraged to consider this species when identifying ‘dolphins’. Pygmy killer whales are easily overlooked.