Green Group discussion

Animals > Sharks

Comments Showing 1-19 of 19 (19 new)    post a comment »
dateDown arrow    newest »

message 1: by Clare (new)

Clare O'Beara | 6643 comments Mod
Let's collect articles about sharks here.
Sharks mature slowly, may produce one to eight young a year, and are at risk while young. They may grow into apex predators along with the orca, while some species such as whale shark and basking shark eat plankton.

Industrial fishing is wiping out shark species faster than they can reproduce.

message 2: by Clare (new)

Clare O'Beara | 6643 comments Mod
A tiny handful of restaurants in UK still serve shark fin soup - considered a delicacy in China. The rise of prosperity in China has increased the number of people willing to pay for this meal. Bite Back a shark awareness group is trying to get the UK to be the first country to ban shark fin soup from menus.

Not mentioned in this article, by law in UK any shark landed by fishermen must have fins-on at the quay. No separate fins may be landed. This is to stop the malign practice of finning and dumping. Shark meat is mostly cartilage and not worth a lot, but may be used in joint health supplements.

message 3: by Clare (new)

Clare O'Beara | 6643 comments Mod
A fiction book on the topic. Shark Fin Soup
Shark Fin Soup by Susan Klaus
And a nice lively fiction about keeping a Great White shark in captivity. This is a highly educational book.

The SeaLand Incident: The Story Behind One Zoo's Infamous Attempt to House a Great White Shark
The SeaLand Incident The Story Behind One Zoo's Infamous Attempt to House a Great White Shark by Brent Saltzman

message 4: by Clare (new)

Clare O'Beara | 6643 comments Mod
Small shark species are rapidly being sorted out and 'discovered' or rediscovered. In this case, a preserved specimen led to the naming of a new species - considered possibly already extinct.
The article coves a few of such rarities.

I'm going to be picky here:
" There’s also the Borneo shark (Carcharhinus borneensis), described in 1858 from a single specimen near the eponymous Indonesian island. "

That's not how to use eponymous. The island of Borneo has the shark named after it, not the other way around.

message 5: by Clare (new)

Clare O'Beara | 6643 comments Mod
Shark studies have their dangers. Especially if you are a shark.

message 6: by Clare (new)

Clare O'Beara | 6643 comments Mod
A duo of films called Sharkwater and Sharkwater Extinction.

message 7: by Clare (new)

Clare O'Beara | 6643 comments Mod
Shark liver is sometimes used in cosmetics. Renamed squalene. Since consumers found out about this, some cosmetic makers have stopped using it.
This link is not viewable in my region.


Telegraph: from 2008 but a well researched article.

message 8: by Clare (new)

Clare O'Beara | 6643 comments Mod
A basking shark is feeding in a west Ireland bay; some nice drone footage.

message 9: by Clare (new)

Clare O'Beara | 6643 comments Mod
Rays are related to sharks and this footage shows a huge manta ray asking divers for help. A free diver (no scuba gear) had to make several attempts to remove a fish hook stuck in her face.

Thanks to Patty Jansen Patty Jansen for that news.

message 10: by Clare (new)

Clare O'Beara | 6643 comments Mod
These sharks both swim and walk. As the short clip shows.

message 11: by Clare (new)

Clare O'Beara | 6643 comments Mod
A long-running shark tagging programme provides a wealth of data about shark movements.

Originally posted:

message 12: by Clare (new)

Clare O'Beara | 6643 comments Mod
""Sri Lanka's long-standing ban offers us an opportunity to assess the impacts of bans, which are increasingly being implemented globally to protect sharks," said lead author Claire Collins, of the University of Exeter and ZSL's Institute of Zoology.

"The ban has almost completely halted targeted fishing for these sharks, so in this sense it has been very successful.

"However, continued bycatch is a problem not only because of the direct impact on this vulnerable species, but also because it makes it tempting for fishers to get round the ban.

"Because it is easy to conceal threshers as other shark species, by cutting fins off before landing, fishers can sell them easily and the ban can be hard for authorities to enforce."
More information: Claire Collins et al, Using perceptions to examine human responses to blanket bans: The case of the thresher shark landing-ban in Sri Lanka, Marine Policy (2020). DOI: 10.1016/j.marpol.2020.104198
Journal information: Marine Policy
Provided by University of Exeter

message 13: by Clare (new)

Clare O'Beara | 6643 comments Mod
Robin Barefield tells us about a particular shark called the Pacific sleeper shark, on her Goodreads blog.

Robin Barefield

message 14: by Clare (new)

Clare O'Beara | 6643 comments Mod
Gorgeous footage of swimming with 20 basking sharks off Ireland's west coast.

"Though they are endangered, hundreds of the sharks have been spotted off the Clare coast earlier this week.

The sharks are a fully protected species in the UK, Malta, and New Zealand, but not here in Ireland, which is something groups like the Irish Basking Shark Group have been calling for in recent years."

message 15: by Clare (new)

Clare O'Beara | 6643 comments Mod
You may be interested in signing an EU Citizens Initiative on banning shark finning.

Here is Sea Shepherd to tell us about this request.

I have signed at this screen.

message 16: by Clare (new)

Clare O'Beara | 6643 comments Mod
Tiger sharks are migrating north as water warms.

Just when you thought it was safe to get back in the water....

" "Given their role as apex predators, these changes to tiger shark movements may alter predator-prey interactions, leading to ecological imbalances, and more frequent encounters with humans." said Hammerschlag."

More information: "Ocean warming alters the distributional range, migratory timing, and spatial protections of an apex predator, the tiger shark (Galeocerdo cuvier)" Global Change Biology (2022). DOI: 10.1111/gcb.16045
Journal information: Global Change Biology
Provided by University of Miami

message 17: by Clare (new)

Clare O'Beara | 6643 comments Mod
The Greenland shark lives very deep and is seldom seen.
One was found on a beach in Cornwall recently, unfortunately, dead. The necropsy has provided new info about this creature.

"A century-old Greenland shark found washed up on a Cornish beach died of meningitis, a post mortem has found.

The Greenland shark is incredibly rare and can live to over 400 years old and the female found just outside Newlyn Harbour in mid-March is still considered a "juvenile" by marine biologists.

Very little is known about the species, they usually over 2.5km below the surface of the Arctic and North Atlantic oceans, and the autopsy is thought to be the first of its kind undertaken in the UK.

"The post-mortem was conducted by the Cornwall Marine Pathology Team, which is part of the Zoological Society of London’s (ZSL) Cetacean Strandings Investigation Programme (CSIP)."

message 18: by Clare (last edited Jul 28, 2022 05:23AM) (new)

Clare O'Beara | 6643 comments Mod
Another shark like the Greenland shark was found in the Caribbean, off Belize. As the scientists quickly released the odd catch, they are not exactly sure which one it was.
"Though these sharks are typically thought to spend most of their time in the frigid waters of the Arctic, some populations do seem to migrate, and there have been occasional sightings around the tropics in recent years, including in the Caribbean. This latest sighting adds another wrinkle, though, since the team was much closer to the shore than other teams have been when they stumbled upon their tropical sleeper. But because the reef has waters that reach as far down as 9,500 feet, there is a plausible source of cold temperatures available for these sharks to live comfortably. Since we know so little about these sharks, they could be much more widely distributed around the world than currently documented."

message 19: by Clare (last edited Sep 19, 2022 03:04PM) (new)

Clare O'Beara | 6643 comments Mod

"Rarely observed circling behaviors of endangered basking sharks have now been explained as "shark speed dating" courtship displays, thanks to a new study.

Marine biologists from the Marine Biological Association (MBA), the Irish Basking Shark Group and colleagues have led ground-breaking research which reveals the circles of basking sharks seen off western Ireland are engaged in annual reproductive behavior, the first place in the world where this has been verified."

More information: David W. Sims et al, Circles in the sea: annual courtship "torus" behaviour of basking sharks Cetorhinus maximus identified in the eastern North Atlantic Ocean, Journal of Fish Biology (2022). DOI: 10.1111/jfb.15187
Journal information: Journal of Fish Biology

back to top