May 31, 2017

‘Faceless Fish’ Among Bevy of Strange Species Hauled From the Ocean Depths

This Faceless Cusk was caught in the Jervis Bay Commonwealth Marine Reserve off New South Wales at depths of 4000 meters during the CSIRO RV Investigator voyage to the abyss.
Faceless fish and other weird and wonderful creatures, many of them new species, have been hauled up from the deep waters off Australia during a scientific voyage that has been studying parts of the ocean never explored before.

During a month-long journey off the country’s eastern seaboard, the research vessel Investigator has surveyed life lurking in a dark and cold abyss that plunges 2.5 miles (four kilometers) below the surface, using nets, sonar, and deep-sea cameras.

Tim O’Hara from Museums Victoria, who serves as chief scientist on board, told AFP on Wednesday that the search area was “the most unexplored environment on earth.”

Bright red spiky rock crabs, puffed-up coffinfish, blind sea spiders, and deep sea eels have been collected since the scientists began their voyage — from Launceston in Tasmania north towards the Coral Sea — on May 15.

They also came across an unusual faceless fish, which has only been recorded once before by the pioneering scientific crew of HMS Challenger off Papua New Guinea in 1873.

A species of rock crab (Neolithodes-cf-bronwynae) from the deep ocean displays a bright red and strikingly spiky shell.
“It hasn’t got any eyes or a visible nose and its mouth is underneath,” O’Hara said from the ship.

At such huge depths, it is so dark that creatures often have no eyes or produce their own light through bioluminescence, he added.

Carnivorous sponges that wield lethal spicules made of silicon — effectively glass — were another striking find. They get small crustaceans hooked on their Velcro-like spines, to be slowly digested in-situ. This technique differs from most deep-sea sponges, which feed on bacteria and other single-celled organisms filtered from passing currents.

“We’ve got 27 scientists on board who are leaders in their fields, and they tell me that around one-third of what we’ve found are new species,” said O’Hara, with several thousand specimens so far retrieved and two weeks of the trip still to go.

This puffed-up coffinfish collected by the RV Investigator belongs to a curious group of deep-sea anglerfishes that live on muddy or rocky seafloors worldwide. They can be difficult to identify, and it may some time before scientists determine whether this one is a new species.
Life at such depths is one of crushing pressures, no light, little food, and freezing temperatures, with animals that call it home evolving unique ways to survive.

As food is scarce, they are usually small and move slowly. Many are jelly-like and spend their lives floating about, while others have ferocious spines and fangs and lie in wait until food comes to them.

Working in such an environment was challenging, O’Hara admitted, with each fishing expedition taking up to seven hours to deploy and retrieve the equipment and its eight kilometers of cable from the sea floor, given it is so far down.

Read more at Discovery News

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