The first data collected on the diving behaviour of reef manta rays in New Caledonia considerably extend the known depth range for this vulnerable species in decline, according to a study published March 18 in the open-access journal PLOS ONE by Hugo Lassauce of the University of New Caledonia, and colleagues. These results add new information on the habitat use of the species in a region where manta behaviour has not previously been studied, and increase their known depth range by more than 200 m.
Reef manta rays (Mobula alfredi) are declining worldwide, in large part due to fishing pressure. More detailed information on the distribution and habitat use of the reef mantas is necessary to inform conservation and fisheries management measures to ensure the long-term survival of the species, now listed as vulnerable on the International Union for Conservation of Nature Red List. Pop-up satellite archival tags (PSAT tags) are one of the most effective methods to investigate fine-scale movements and habitat use in manta rays, but until now, there have been no such studies conducted in New Caledonian waters. In the new study, Lassauce and colleagues report the results from nine PSAT tags deployed in New Caledonia, recording the world’s deepest known dives for reef manta rays. MORE
Header image: Manta ray tagging. Credit: Hugo Lassauce.