Navigation Links
Triple threat: World fin trade may harvest up to 73 million sharks per year

The first real-data study of sharks harvested for their valuable fins estimates as few as 26 million and as many as 73 million sharks are killed each year worldwide--three times higher than was reported originally by the United Nations, according to a paper published as the cover story in the October 2006 edition of Ecology Letters.

"The shark fin trade is notoriously secretive. But we were able tap into fin auction records and convert from fin sizes and weights to whole shark equivalents to get a good handle on the actual numbers," says lead author Shelley Clarke, Ph.D, an American fisheries scientist based in Hong Kong and Japan.

A team of researchers calculated the number of sharks represented in the fin trade using a unique statistical model and data from Hong Kong traders. When the figures were converted to shark weight, the total is three to four times higher than shark catch figures reported to the United Nations Food and Agricultural Organization (FAO).

"Without any real data, numbers as high as 100 million had been floating around for a while, but we had no way of knowing whether or not this was accurate," says Ellen Pikitch, Ph.D., co-author and executive director of the University of Miami's Pew Institute for Ocean Science. "This paper, which produces the first estimate based on real data, shows that the actual number of sharks killed is indeed very high but is more likely to be in the order of tens of millions, with a median estimate of 38 million sharks killed annually."

Concern about the shark finning trade has grown over the past few years as demand has surged beyond sustainable levels for slow-to-produce shark populations and without regulation in most countries. Three shark species are listed on the Convention on International Trade in Endangered Species of Wild Flora and Fauna (CITES), and 20 percent are threatened with extinction according to the 2006 Red List of Threatened Species.

Used in shark fin soup, a delicacy served at Chinese weddings and other celebrations for centuries and more recently at business dinners in Southeast Asia and the Pacific Rim, fins are the most valuable part of the shark, which typically are sliced off as the shark, sometimes still alive, is thrown back into the ocean. The shark fin trade appears to be keeping pace with the growing demand for seafood--up five percent per year in mainland China. Determining whether shark populations can continue to withstand the magnitude of catches estimated by Clarke and her team depends upon the size and status of each population.

"One of the most productive sharks is the blue shark, and it appears that the catch rate is near the maximum sustainable level," says Clarke. "But such assessments were not available for other, less productive shark species. It is quite likely that sustainable catch levels have already been exceeded in some cases."

The United Nations FAO compiles catch records for sharks and other fish, based on information submitted from member countries. Where possible, the FAO attempts to verify the accuracy of the figures, but verification often is not practical. Many sharks may be recorded as unidentified fish and thus not be recognizable as sharks in the FAO records.

"Due to the low value of shark meat in many markets, shark fins may be the only part of the shark retained, and often these fins are not recorded in the catch log or when landed at ports. I knew we had to somehow access the major markets if we were to accurately estimate the number of sharks killed," says Pikitch, who initiated the project.
'"/>

Source:Blackwell Publishing Ltd.


Related biology news :

1. Triple threat polymer captures and releases
2. Triplex assay used to assay duplex genomic DNA
3. Worlds largest rainforest drying experiment completes first phase
4. World-first Living Donor Islet Cell Transplant A Success; Procedure Offers Promise For Diabetics
5. New Estimates For The Causes Of Child Deaths Worldwide
6. New World founders small in number
7. OneWorld Health drug receives Orphan designation from U.S. and European regulatory agencies
8. Measles Deaths Worldwide Drop By Nearly 40% Over Five Years
9. Ancient DNA helps clarify the origins of two extinct New World horse species
10. UN: World in big ecological mess
11. IMF Launches World’s First DNA Database for Myeloma Patients

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/24/2017)... -- Janice Kephart , former 9/11 Commission ... LLP (IdSP) , today issues the following statement: ... 6, 2017 Executive Order: Protecting the Nation ... instilled with greater confidence, enabling the reactivation of ... are suspended by until at least July 2017). ...
(Date:4/18/2017)... , April 18, 2017  Socionext Inc., a global expert ... a media edge server, the M820, which features the company,s hybrid ... software provided by Tera Probe, Inc., will be showcased during the ... the NAB show at the Las Vegas ... ...
(Date:4/13/2017)... , April 13, 2017 UBM,s Advanced ... will feature emerging and evolving technology through ... Innovation Summits will run alongside the expo portion of ... sessions, panels and demonstrations focused on trending topics within ... advanced design and manufacturing event will take place June ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... ... 12, 2017 , ... AMRI, a global contract research, development ... patient outcomes and quality of life, will now be offering its impurity solutions ... new regulatory requirements for all new drug products, including the finalization of ICH ...
(Date:10/11/2017)... YORBA LINDA, CA (PRWEB) , ... October 11, ... ... adapted to upregulate any gene in its endogenous context, enabling overexpression experiments and ... activation (CRISPRa) system with small RNA guides is transformative for performing systematic gain-of-function ...
(Date:10/11/2017)... ... 2017 , ... Proscia Inc ., a data solutions ... “Pathology is going digital. Is your lab ready?” with Dr. Nicolas Cacciabeve, Managing ... how Proscia improves lab economics and realizes an increase in diagnostic confidence.* ...
(Date:10/11/2017)... ... October 11, 2017 , ... Disappearing forests and increased emissions ... over 5.5 million people each year. Especially those living in larger cities are affected ... based in one of the most pollution-affected countries globally - decided to take action. ...
Breaking Biology Technology: