Putting It To Work: New Publication on Manta and Mobula Rays Published Using REEF Data

A Manta Ray swimming at the Flower Garden Banks National Marine Sanctuary. Photo by Jackie Reid/NOAA.

We are excited to share a new scientific paper published last month in the journal PLoS ONE that included REEF data - Global Population Trends and Human Use Patterns of Manta and Mobula Rays, by Christine Ward-Paige, Brendal Davis, and Boris Worm. Despite being the world’s largest rays and providing significant revenue through dive tourism, little is known about the population status, exploitation, and trade volume of mobulids (Manta and Mobula species). There is anecdotal evidence, however, that mobulid populations are declining, largely due to the recent emergence of a widespread trade for their gill rakers. Researchers from Dalhousie University and eShark.org used expert divers’ observations from two citizen science programs, REEF's Volunteer Fish Survey Project and eShark.org, to describe global manta and devil ray abundance trends and human use patterns. The study highlights the relative rarity of aggregation sites on a global scale and reveals that many populations appear to be declining. The authors warn that newly emerging fisheries for the rays gill-­‐rakers likely exceed their ability to recover. The study also demonstrates the deficiency of official catch reports, as only four countries have ever reported landing manta or devil rays– Indonesia, Liberia, Spain, and Ecuador. However, numerous diver reports compiled in the paper illustrate that many other countries are regularly landing and selling these rays without reporting.

The paper can be viewed online here. A complete listing of all papers that have featured REEF data can be found online here.

Design by Joanne Kidd, development by Ben Weintraub