Washington, May 23 : A new study has determined that over 50 percent of oceanic shark species are threatened with extinction.
This international study, organised by the IUCN Shark Specialist Group (SSG), was conducted by 15 scientists from 13 different research institutes around the world, with additional contributions from scores of other SSG members.
Done to determine the global threat status of 21 species of wide-ranging oceanic pelagic sharks and rays, the study revealed serious overfishing as a major cause of the threat faced by these marine species.
The experts determined that 16 out of the 21 oceanic shark and ray species that are caught in high seas fisheries are at heightened risk of extinction due primarily to targeted fishing for valuable fins and meat as well as indirect take in other fisheries.
In most cases, these catches are unregulated and unsustainable.
Also, the increasing demand for the delicacy 'shark fin soup', driven by rapidly growing Asian economies, means that often the valuable shark fins are retained and the carcasses discarded.
Another reason of sharks and rays being particularly vulnerable to overfishing is due to their tendency to take many years to become sexually mature and have relatively few offspring.
"Fishery managers and regional, national and international officials have the opportunity and the obligation to halt and reverse the rate of loss of biodiversity and ensure sharks and rays are exploited sustainably," according to lead author Nicholas Dulvy from the Centre for Environment, Fishers and Aquaculture Science, Lowestoft Laboratory in UK.
According to Dulvy, the current rate of biodiversity loss is ten to a hundred times greater than historic extinction rates, and as humans make increasing use of ocean resources, it is possible that many more aquatic species, particularly sharks, are coming under threat.
"This does not have to be an inevitability. With sufficient public support and resulting political will, we can turn the tide," he said.
The study recommends key steps that governments can take to safeguard marine populations, like, establishing and enforcing science-based catch limits for sharks and rays, ensuring an end to shark finning, improving the monitoring of fisheries taking sharks and rays, minimizing incidental catch of sharks and rays, and, cooperating with other countries to conserve shared populations.
"The traditional view of oceanic sharks and rays as fast and powerful too often leads to a misperception that they are resilient to fishing pressure," said Sonja Fordham, co-author of the study paper.
"Despite mounting evidence of decline and increasing threats to these species, there are no international catch limits for oceanic sharks. Our research shows that action is urgently needed on a global level if these fisheries are to be sustainable," she added.