ScienceDaily (Feb. 18, 2008) — Sharks are disappearing from the world's oceans. The numbers of many large shark species have declined by more than half due to increased demand for shark fins and meat, recreational shark fisheries, as well as tuna and swordfish fisheries, where millions of sharks are taken as bycatch each year.

Now, the global status of large sharks has been assessed by the World Conservation Union (IUCN), which is widely recognized as a highly comprehensive, scientific-based information source on the threat status of plants and animals.

"As a result of high and mostly unrestricted fishing pressure, many sharks are now considered to be at risk of extinction," explained Julia Baum, a member of the IUCN's Shark Specialist Group who will be speaking at the American Association for the Advancement of Science Annual Conference in Boston on February 17.

"Of particular concern is the scalloped hammerhead shark, an iconic coastal species, which will be listed on the 2008 IUCN Red List as globally 'endangered' due to overfishing and high demand for its valuable fins in the shark fin trade," added Baum, who is an NSERC Postdoctoral Fellow at Scripps Institution of Oceanography.

Baum pointed out that fishing for sharks in international waters is unrestricted, and she supports a recently adopted United Nations resolution calling for immediate shark catch limits as well as a meaningful ban on shark finning (the practice of removing only a shark's fins and dumping the still live but now helpless shark into the ocean to die).

Research at Dalhousie University over the past five years, conducted by Baum and the late Ransom Myers, demonstrated the magnitude of shark declines in the northwest Atlantic Ocean. All species the team looked at had declined by over 50 per cent since the early 1970s. For many large coastal shark species, the declines were much greater: tiger, scalloped hammerhead, bull and dusky shark populations have all plummeted by more than 95 per cent.

enlarge

The scalloped hammerhead shark is threatened by shark finning -- the practice of removing only a shark's fins and dumping the still live but now helpless shark into the ocean to die. (Credit: iStockphoto/Ian Scott)

Related Stories

Over 50 Percent Of Oceanic Shark Species Threatened With Extinction (May 25, 2008) — The first study to determine the global threat status of 21 species of wide-ranging oceanic pelagic sharks and rays reveals serious overfishing and recommends key steps that governments can take to ...  > read more

Research Lifts Blindfold On Shark Vision (Feb. 26, 2007) — Sandbar sharks might have prized flesh and fins which are culinary delicacies, but scientists are more interested in their eyes. University of Queensland PhD student Lenore Litherland along with ...  > read more

Trade Protection Denied For Two Shark Species Prized For Fins, Says World Wildlife Fund (June 12, 2007) — Two shark species highly prized for their meat and fins have not gained trade protection under CITES, the Convention for International Trade in Endangered Species of Wild Fauna and Flora, say World ...  > read more

Triple Threat: World Fin Trade May Harvest Up To 73 Million Sharks Per Year (Sep. 25, 2006) — The first real-data study of sharks harvested for their valuable fins estimates as many as 73 million sharks are killed each year worldwide -- three times as many as originally reported by the United ...  > read more

Search ScienceDaily

Shark-Inspired Boat Surface