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 Today


The Maritime Industry's original and most viewed E-News Service

Maritime Reporter February 2016 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

People & Company News

SunEdison Restrained from 'Unusual' Asset Transfers

Solar company SunEdison Inc said a U.S. court has restrained the company from making any unusual asset transfers until a hearing in a lawsuit brought on by investors

Maersk to Scrap Ships at India's Alang Beaches, NGO Dismayed

Maersk Line said on Friday it had chosen four shipbreaking yards along India's Alang beaches to handle an increase in vessels that need to be scrapped, to the dismay

Teknotherm Marine Moves HVAC Arm to Bergen

Maritime heating, ventilation and air conditioning (HVAC) firm Teknotherm Marine has established a new subsidiary is established with the name Teknotherm Marine HVAC AS.

Technology

Sentinel Launches New Rudder Feedback Unit

Sentinel, a Beier Radio company, has designed and manufactured a new Rudder Feedback Unit (RFU) with many new features, including watertight components and connections

Innovative Equipment Will Help Unload Listing Ship

Following Smit Salvage’s salvage of the stricken ship Modern Express in the Gulf of Biscay, another Rotterdam company has now become involved in the rescue operations.

Sea IT, Veritas Tankers Ink Long-term Software Deal

Sea IT has entered a long term ICT agreement with Veritas Tankers. The agreement comprises installation of BlueCORE Generation 4, an ICT platform specifically developed for the marine industry,

News

Nordana Sea Delivered to Symphony Shipping

After successful sea trials, M.V. Nordana Sea was delivered to Symphony Shipping on February 11, 2016. Constructed by builder Ferus-Smit in the Netherlands (yard number 419),

NATO Ships Arrive in Batumi

This morning, four NATO ships assigned to Standing NATO Mine Counter-Measures Group TWO (SNMCMG2) arrived in Batumi, Georgia for a scheduled visit in an effort

US Oil Drillers Cut Rigs to Least in 6 Years

U.S. energy firms this week cut oil rigs for an eighth week in a row to the lowest levels since January 2010, data showed on Friday, as energy firms continue to

Marine Science

OSD Designs Research Vessel for TORI

Offshore Ship Designers (OSD-IMT) has signed a new contract to design an IMT2001 Scientific Research Vessel for the Taiwanese Ocean Research Institute (TORI).    The

Update on Seagull Mobile apps for Crew

The Seagull mobile app for crew training status is set to revolutionise the way seafarers track their training records and receive critical safety alerts, by making

Royal Caribbean Ship Thrashed by Storm Returns on Wednesday

A Royal Caribbean cruise ship forced to turn back early after being battered by an Atlantic storm was expected to return to its New Jersey port at 9 p.m. on Wednesday (0200 GMT Thursday),

Ocean Observation

UK to Double NATO Naval Deployments in 2016

Britain is doubling its naval deployments to North Atlantic Treaty Organization (NATO) in a move aimed a showing enemies that "we are ready to respond to any threat",

CMA-CGM and Cosco Alliance in the Offing?

The newly-formed shipping giant China Cosco Shipping Corporation and CMA CGM met recently in Shanghai to discuss the possibility of a new French-Asian alliance, say local Chinese media.

Bangladesh, Thailand Plans Direct Coastal Shipping

Bangladesh and Thailand are planning to launch direct coastal shipping, connecting the Chittagong Port in the Bay of Bengal with the Ranong Port in the East of

 
 
Maritime Careers / Shipboard Positions Maritime Security Offshore Oil Pipelines Port Authority Salvage Ship Electronics Ship Repair Ship Simulators 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: 0.1051 sec (10 req/sec)