Ocean giants in crisis: manta and devil ray deaths reach staggering 259,000 annually, study reveals

A groundbreaking international study has revealed that more than 259,000 manta and devil rays die in global fisheries each year—far exceeding previous estimates and painting a dire picture for these majestic ocean creatures. The research, published in Biological Conservation, analyzed data from 99 countries and represents the most comprehensive assessment of mobulid ray mortality to date.

The study’s findings are particularly alarming because manta and devil rays are slow-growing species that cannot withstand high fishing pressure. Lead researcher Betty Laglbauer from the UK-based Manta Trust warns that the true death toll may be even higher, as “significant data gaps” remain in regions known for high mobulid catches. Many fishing nations either fail to report these catches or lump them together with other species, masking the true scale of mortality.

Historical data reveals the devastating impact on ray populations, with eight of 92 countries showing catch rate declines of 51-99%. In Mozambique alone, sightings have plummeted by 81-99% over two decades. The researchers gathered evidence from multiple sources, including fisheries surveys, databases, published records, and expert interviews to build their comprehensive picture.

This research highlights a critical gap in marine conservation efforts. While these gentle giants face mounting threats from fishing activities—both as targeted catches and accidental bycatch—inadequate monitoring has long obscured the true extent of population declines. The study’s authors emphasize that immediate action is needed to protect these vulnerable species before further irreversible damage occurs to their populations worldwide.