A Third of Shark and Ray Species May Face Extinction

A Third of Shark and Ray Species May Face Extinction

The health of “entire ocean ecosystems” and food security is in jeopardy, said Dulvy, a former co-chair of the shark specialist group of the International Union for Conservation of Nature (IUCN).The number of species of sharks, rays, and chimaeras, known together as chondrichthyan fishes, facing “a global extinction crisis” has more than doubled in less than a decade, according to the paper published September 6 in the journal Current Biology.

Shark numbers decline amid research gaps

Shark numbers decline amid research gaps

New research published in premier science journal Nature last week, with input from NIWA, showed the global population of oceanic sharks and rays has declined by more than 70 per cent in the past 50 years, with ongoing decline likely to lead to the extinction of some species.

Extremely rare albino shark discovered in Auckland

Extremely rare albino shark discovered in Auckland

The albino lucifer's dogfish found by Dr. Brit Finucci is the first record of albinism in the lanternshark family, Etmopteridae.Because the species of shark lives in near or total darkness, Dr. Finucci says it’s unlikely that the shark’s albino condition had a considerable effect on its life.

Giant squid and glow-in-the-dark sharks surprise scientists

Giant squid and glow-in-the-dark sharks surprise scientists

A giant squid and several glow-in-the-dark sharks were surprise finds for NIWA scientists last month on the Chatham Rise during a voyage to survey hoki, New Zealand’s most valuable commercial fish species.

Acidifying Oceans Could Eat Away at Sharks' Skin and Teeth

Acidifying Oceans Could Eat Away at Sharks' Skin and Teeth

They found that on average, a quarter of the denticles on the sharks in acidic water were damaged, compared to 9.2 percent on the controls.

Recovery: The Seal and Shark Invasion

Recovery: The Seal and Shark Invasion

Photo © Atlantic White Shark Conservancy Fish and wildlife recovery can be unpopular, especially when it inconveniences the public.Great white shark predation on seal off Monomoy National Wildlife Refuge at the elbow of Cape Cod. Photo © Atlantic White Shark Conservancy Is the recolonization of gray seals helping with white shark recovery?

Inside the ‘Black Box’ of a Neural Network

Inside the ‘Black Box’ of a Neural Network

By inserting a postage-stamp image of a baseball, they found they could confuse the neural network into thinking a whale was a shark.

Dun Dun. Duun Duuun! The Great White Shark Genome Is Here

Dun Dun. Duun Duuun! The Great White Shark Genome Is Here

The Great White Shark Genome Is Here Sharks are renowned for their wound healing, lifespans of 70-odd years, and low rates of cancer. Stanhope and Shivji’s new map reveals that great white sharks also possess huge chunks of code for these genome-stabilizing DNA repair mechanisms and for tumor suppression.

Shark survival tale

Shark survival tale

Warrick Lyon, a NIWA fisheries technician, says the study is heading to the Pacific to test survival rates for sharks treated differently – such as those where hooks are not removed and where long pieces of monofilament fishing line are left attached.

Treasure found on Northland beach

Treasure found on Northland beach

A data transmitting tag that was attached to a mako shark recovered from Ninety Mile Beach (upper) compared to a new tag (lower).

New large shark species heading for the UK? That’s no cause for panic

New large shark species heading for the UK? That’s no cause for panic

This detailed study of Australian tiger sharks suggested that an increase in water temperature of 1-2°C will lead to them being seen off New South Wales all year round (at the moment, they tend only to visit the region in summer).