Diving with hunting squid

A fascinating video of Humboldt squid flashing colors as they appear to coordinate in a hunt. See the video here.

Revealed: Secrets of the Camouflage Masters

From the New York Times:

"After decades of dives, a scientist offers a theory to explain the spectacular deceptions of cephalopods."



Read the full article here, and see a neat video of a cuttlefish in 'action'.

Large squid lights up for attack

"Big deep-sea squid emit blinding flashes of light as they attack their prey, research shows.

Taningia danae's spectacular light show was revealed in video footage taken in deep waters off Chichijima Island in the North Pacific.

Japanese scientists believe the creatures use the bright flashes to disorientate potential victims.

Writing in a Royal Society journal, they say the squid are far from the sluggish, inactive beasts once thought.

In fact, the footage, taken in 2005 - the first time T. danae had been captured on camera in their natural environment - reveals them to be aggressive predators.

The squid, which can measure over 2m (7ft) in length, deftly swim backwards and forwards by flapping their large, muscular fins. They are able to alter their direction rapidly by bending their flexible bodies.

The films, taken at depths of 240m to 940m (790 to 3,080ft), also show the cephalopods reaching speeds of up to 2.5m (8ft) per second as they attack the bait, capturing it with their eight tentacles.

Blinding flashes

However, the intense pulses of light that accompanied the ferocious attacks surprised the research team.

Dr Tsunemi Kubodera from the National Science Museum in Tokyo, who led the research, told the BBC News website: "No-one had ever seen such bioluminescence behaviour during hunting of deep-sea large squid."

The footage reveals the creatures emitting short flashes from light-producing organs, called photophores, on their arms.

Writing in Proceedings of the Royal Society B, the team said: "[The bioluminescence] might act as a blinding flash for prey."

The light would disorientate the squid's intended prey, disrupting their defences, they added.

It could also act, the scientists commented, "as a means of illumination and measuring target distance in an otherwise dark environment."

However, further investigation revealed the light bursts may also serve another, quite different, purpose away from the hunting field - courtship.

As the squid drifted around torches that had been attached to the bait rig, they emanated long and short pulses of light.

The team believe the torch lights may have resembled another glowing T. danae, and the squid were possibly emitting light as courtship behaviour.

Difficult subjects

Deep-sea squid - once thought to be legendary monsters of the sea - are notoriously difficult to study, and little is known about their ecology and biology. Several species prowl the ocean depths.

T. danae is thought to be abundant in the tropical and subtropical oceans of the world. The largest reported measured 2.3m (7.5ft) in length and weighed nearly 61.4kg (134.5lbs).

Larger species of giant squid belong to the Architeuthidae family: females are thought to measure up to 13m (43ft) in length.

But the aptly named colossal squid (Mesonychoteuthis hamiltoni) is thought to be the largest of all - possibly reaching up to 14m (46ft) long."

See a short video here

Mother Squids Nurse Eggs

"Researchers said they have uncovered evidence that some mother squids nurse their eggs for months after laying them, helping to disprove a long-held theory that all female squids simply abandoned new offspring on the ocean floor.



Mother squids of the Gonatus onyx species were found to lug around pouches of new eggs in their tentacles for up to six to nine months at a time, even though the load can weigh a quarter of their own weight and makes the mother slower and more vulnerable to predators, according to a study published in the Dec. 15 issue of the journal Nature."

Scientists Capture Giant Squid in Photos

"The giant squid can be found in books and in myths, but for the first time, a team of Japanese scientists has captured on film one of the most mysterious creatures of the deep sea in its natural habitat.



The team led by Tsunemi Kubodera, from the National Science Museum in Tokyo, tracked the 26-foot long Architeuthis as it attacked prey nearly 3,000 feet deep off the coast of Japan's Bonin islands.

'We believe this is the first time a grown giant squid has been captured on camera in its natural habitat,' said Kyoichi Mori, a marine researcher who co-authored a piece in Wednesday's issue of the Proceedings of the Royal Society B: Biological Sciences.

The camera was operated by remote control during research at the end of October 2004, Mori told The Associated Press on Wednesday."