Great White Sharks Live Far Longer Than Supposed

SeaDiscovery.com
Thursday, January 09, 2014
Great White: Photo Wiki CCL

Great white sharks, top predators throughout the world's ocean, grow much slower and live significantly longer than previously thought, according to a new study led by the Woods Hole Oceanographic Institution (WHOI).

In the first successful radiocarbon age validation study for adult white sharks, researchers analyzed vertebrae from four females and four males from the northwestern Atlantic Ocean. Age estimates were up to 73 years old for the largest male and 40 years old for the largest female.



“Our results dramatically extend the maximum age and longevity of white sharks compared to earlier studies,” said Li Ling Hamady, MIT/WHOI Joint Program student and lead author of the study. “Understanding longevity of the species, growth rate, age at sexual maturity, and differences in growth between males and females are especially important for sustainable management and conservation efforts.”

For this study, researchers took advantage of radiocarbon produced by thermonuclear device testing done during the 1950s and 1960s. Radiocarbon mixed from the atmosphere into the ocean, and was incorporated into the tissues of marine organisms living during that time period. The rise in radiocarbon gave researchers a specific spot in time pinpointed in the vertebra layers, which can be used as a “time stamp” to help determine the age of an animal.

“This research demonstrates the power of applying cutting-edge techniques in isotope geochemistry to answer fundamental questions in ocean ecology,” said co-author Simon Thorrold, a biologist at WHOI and Hamady’s Ph.D. advisor. "The radiocarbon time stamp in white shark vertebrae provides irrefutable evidence of white shark longevity that had proved to be impossible to verify using traditional age estimation methods.”

Full information on the research is available at: http://www.whoi.edu/news-release/LongevityWhiteSharks

 

 

 

Maritime Reporter August 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

People & Company News

That’s Not Coming on Board!

There’s hardly anything that can’t be shipped in a container. However, for ethical reasons, Hapag-Lloyd refuses to transport certain goods.   Anyone who regularly transports goods for third parties,

US Navy Awards $22mln Waterfront Inspection Deal

The U.S. Navy has awarded a five-year, $22 million contract to Appledore Marine Engineering, a specialist focusing exclusively on the inspection and design of marine infrastructure,

Offshore Operators Can Simplify Safety Equipment Logistics

Safety equipment manufacturer VIKING Life-Saving Equipment said its Offshore Safety Agreements are providing relief for offshore operators seeking to ensure compliance

Technology

SHIPFLOW Version 6 Released

SHIPFLOW 6 comes with a new module for computing ship motions in waves and the SHIPFLOW RANS solver is up to 10 times faster than its predecessor.   SHIPFLOW

Keppel Delivers Jackup to UMW-OG

Keppel FELS, a wholly owned subsidiary of Keppel Offshore & Marine (Keppel O&M) has delivered UMW Naga 8, a KFELS B Class jackup rig, to Malaysia’s UMW Oil & Gas Corporation Berhad (UMW-OG).

Subsea 7 Bags $150 million Offshore UK Contract Maersk

Offshore contractor Subsea 7 has been awarded a $150 million subsea, umbilical, riser and flowline (SURF) contract by Maersk Oil for the development of the Culzean field in the UK North Sea.

News

Five Chinese Ships in Bering Sea as Obama Visits Alaska

Five Chinese Navy ships are sailing in international waters in the Bering Sea off Alaska, the Pentagon said on Wednesday, in an apparent first for China's military that came as U.

White House: No Threat from China Navy Ships in Bering Sea

The Pentagon has not detected any threatening activity from the Chinese navy vessels in the Bering Sea, the White House said on Wednesday.   "Based on their analysis

Recent Vessel Sales - August 2015

Vessel sales for August 2015 (as of September 1) as prepared by Shipping Intelligence, Inc., New York.   Date Reported - Vessel Name - DWT - Built - (Age)

Marine Science

Obama Pushes for US Icebreakers

President Barack Obama on Tuesday proposed a faster timetable for buying a new heavy icebreaker for the U.S. Arctic, where quickly melting sea ice has spurred more

Shipboard Waste Heat Recovery Technology

Calnetix Technologies, LLC has published a White Paper describing new processes for producing supplemental power for a ship’s electrical load. The White Paper,

Hurricane Fred Strengthens in Eastern Atlantic

Hurricane Fred strengthened early Monday in the eastern Atlantic as it approached the Cape Verde Islands, while the remnants of Tropical Storm Erika brought flooding to parts of South Carolina,

Ocean Observation

India's Oil Exploration near South China Sea Irks China

The state-run China Daily says that India's plans to conduct oil exploration off Vietnam coast in the South China Sea is "illegal and is an "unwise move" that

Seychelles to Join India-led Maritime Security Alliance

Seychelles  said that Indian ocean region "belongs" to countries sharing maritime boundaries and said it was "actively" considering participating in a security

Hurricane Fred Strengthens in Eastern Atlantic

Hurricane Fred strengthened early Monday in the eastern Atlantic as it approached the Cape Verde Islands, while the remnants of Tropical Storm Erika brought flooding to parts of South Carolina,

 
 
Maritime Careers / Shipboard Positions Maritime Standards Naval Architecture Navigation Pod Propulsion Salvage Ship Repair Ship Simulators Shipbuilding / Vessel Construction Sonar
rss | archive | history | articles | privacy | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.5931 sec (2 req/sec)