Aug 16, 2016

Greenland SharkThere are plenty of animals on Earth that are pretty good at sticking around. Elephants can live into their 80s, the world's oldest tortoise survived until around 250, and bowhead whales can reach the ripe old age of 200. But a new study has revealed the enigmatic Greenland shark to be the longest-living vertebrate on Earth, with one specimen estimated to be a whopping 392 years of age.

The Greenland shark is found in the waters of the North Atlantic and can reach lengths of 4 to 5 m (13 to 16 ft). They take their sweet time in getting there, however, with growth rates of about 1 cm (0.4 in) per year.

Photo: The team is now working to learn more bout the mysterious Greenland shark (Credit: Julius Nielsen)

Not a whole lot is known about the biology of the Greenland shark, but this slow growth rate has led biologists to suspect it has an exceptionally long lifespan. One was captured and tagged near Greenland in 1936 and then recaptured 16 years later, with researchers recording an increase in length of just 6 cm (2.4 in). This led them to estimate that the shark was more than 200 years old.

But a new study has indicated that Greenland sharks are capable of living much, much longer than that. Researchers from the University of Copenhagen used radiocarbon dating techniques on the eye lenses of 28 female sharks that were inadvertently captured in fishing nets.

Through their analysis, the team estimates that the oldest shark of the group, which measured a mammoth 502 cm (16.5 ft) in length, is 392 years old. One slightly shorter shark, of 493 cm (16.2 ft) in length, was calculated to be 335 years old, with the average lifespan of the entire group estimated to be 272 years.

Based on earlier research suggesting female Greenland sharks reach sexual maturity at lengths of 400 cm (13.1 ft), the scientists say they may not even start to reproduce until the age of 156. They note that there is still much uncertainty around the estimates, but they paint a clear enough picture to conclude the Greenland shark is unmatched when it comes to longevity.

"What we can say is that with 95 percent certainty the oldest shark was between 272 and 512 years old," says Julius Nielsen from the University of Copenhagen. "Even the lower part of this uncertainty, which is that the sharks can live for at least 272 years, makes the Greenland shark the longest living vertebrate animal in the world."

Nielsen is now working to learn more about the mysterious creatures and answer questions about their genetics, how they hunt, what their migration patterns are like and if they are indeed blind as has been suggested.

Story and photo courtesy American Associate for the Advancement of Science via GizMag

 

Destinations

  • Prev
In the 1920s, a small cove in Canoe Bay was used as a shipping point and safe-haven for rum runners ...
Here’s an update from Caroline Swann with some news for the adventurous types who may be heading to ...
The New Glasgow marina is located about six miles up the East River of Pictou in the heart of the ...
The British Virgins took a huge hit last fall from Irma. Boats were stranded on the shore by the ...
Located about half way between Shediac and the Miramichi on New Brunswick’s Acadian Coast, the town ...
Suddenly the once forsaken city of Hamilton, Ontario is booming for at least two good reasons.
The Salty Dawg Sailing Association (SDSA) invites all sailors to join a cruising rally from the ...
Long popular with New England and St. John area boaters, Passamaquoddy Bay is too often overlooked ...
We did breakfast yesterday in the Greek port of Piraeus, just outside Athens:strong coffee, crisp ...
After much speculation Prince Harry finally popped the question to American actress and longtime ...

 

My Happy Place – Lake Simcoe and the Trent-Severn Waterway

My Happy Place – Lake Simcoe and the Trent-Severn WaterwayBy Paul and Sheryl Shard

It’s funny how a body of water can shape you. Shape your mood. Shape your friendships. Shape your future.

Since you’re reading Canadian Yachting, then I’m pretty sure you have a sense of what I’m talking about here - a favourite lake, bay, pond, river or ocean that, when you’re near it, in it or on it, it makes your heart sing and good things happen.

For me, this is Lake Simcoe and the Trent-Severn Waterway in Ontario. Although my husband, Paul, and I have sailed over 100,000 nautical miles in the four sailboats we’ve owned and have been blessed to visit..

Read more about Lake Simcoe and the Trent-Severn Waterway....

 

The Moorings Banner

Lifestyle

  • Prev
This beauty came our way from Reel Deal Yachts in Bahia Mar, Florida. Why not charter for the ...
This new legislation from Washington State Department of Fisheries applies to boats launched in ...
Don’t miss this brilliant photo double header
In honour of Launch Day, our POTW this time comes from Wendy Loat in Port Credit. This shot, taken ...
Our favorite, Man-O-War Cay, is home to the Albury Boat Building empire. They have been building ...
On the Easter Weekend, the Sidney North Saanich Yacht Club from Vancouver Island, had its first ...
We were finally able to get a SIM card and data plan on our phone Monday morning. We could now ...
It’s Friday afternoon at the Newport Yacht Club in Stoney Creek, and that can only mean one thing - ...
As things are always better in the Bahamas, especially during Canadian winters, so too are things ...
We were all set with this week’s POTW when a real stunner came in as part of a story on the Blind ...
Canadian Yachting Digital May 2018

Boat Reviews

  • Prev
At the boat shows, the Ranger Tugs’ classic tugboat lines always grab the crowds, with the wives ...
Tactical Custom Boats announces the sale to a North American client of a custom Tactical 77’ – Fast ...
Bruce Elliott is an inventor. And when he sold the technology he developed to build utility poles ...
One often asks of a winning achievement or a fabulous design, could it have possibly been done ...
The latest new model from Cruisers Yachts is the Cantius 42 and this yacht made its debut in the ...
The Sabre 45 Salon Express is new for 2017, making its debut at the Fort Lauderdale International ...
Jeanneau’s newest NC model is the NC 33, and it’s an exciting and innovative inboard cruiser ...
The Four Winns H290OB combines two of the most popular new big boat trends to come up with a great ...
Commodore’s Boats is a full service shipyard with over 50 years of generational history and ...

 

Ranger Tugs R-23

Ranger Tugs R-23By: Andy Adams

At the boat shows, the Ranger Tugs’ classic tugboat lines always grab the crowds, with the wives and children most likely to want to stop and have a better look. Well, they should, because the Ranger Tugs R-23 deserves a second look…a long look in fact.

Yes, it’s really a “personality” boat that looks great out on the water, and it will turn heads and start conversations at the gas docks, the locks, or just about anywhere boaters congregate, but the Ranger Tugs R-23 is far more than just cute.

Read more about the Ranger Tugs R-23...

 

 

DIY & How to

  • Prev
Modern marine engines run at very high temperatures and rely on a few methods to keep their ...
Pyrotechnic distress flares have been around for decades, while electronic strobe distress flares ...
In the early spring, just after launch, with the hustle and bustle of engine checks, antifouling, ...
All engines, including marine engines (inboards, outboards and stern drives) have many moving parts ...
Most of us don’t give a second thought to our sacrificial anodes – those curious knobs of raw metal ...
I once heard an argument at a yacht club. Two old salts, patiently itching to let go lines and ...
In this time of boat show afterglow, many boaters are counting the days until launch. 
This one-day course consists of both theory and practical demonstration sessions, is designed to ...
Water has a funny way of making its way into a boat: through through-hulls, stuffing boxes, leaks, ...
If you walk the aisles at a boat show, visit a marine store, or stop in at a repair shop, you’ll ...

Marine Products

  • Prev
Industry Firsts Include Direct Injection and Integrated Electric Steering System
Verviers, Belgium, 18 May 2018 — Mercury Marine, the world leader in marine propulsion technology, ...
Again, we return to the beginning. We started this column with a look at marine navigation for ...
Ga-Oh (spirit of the winds in Algonquin) creates bags and other items from re-purposed sails.
The 2018 Northwest Boat Travel Guide just arrived. This time of the year is the perfect time for ...
We are all looking to gain a little more time these days, and technology is often the route we ...
While they are no longer a part of the CPS Flare Program, Fogh Boat Supplies and Fogh Marine, both ...
We have all had the experience of heading down below on a nice boat only to encounter an unpleasant ...
Starting from the top. If you partake in any winter activities, you have probably heard that your ...
Last year when this column launched a good deal of time was spent understanding global satellite ...