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Beyond the Abyss: Caught on Camera

By R&D Editors | October 21, 2008

Beyond the Abyss: Caught on Camera

Snailfish (liparid fish)
Snailfish (or liparid fish), the world’s deepest living fishes, swarming over their bait. Courtesy of Natural Environment Research Council and University of Aberdeen

Scientists filming in one of the world’s deepest ocean trenches have found groups of highly sociable snailfish swarming over their bait nearly five miles beneath the surface of the Pacific Ocean. This is the first time cameras have been sent to this depth.

“We got some absolutely amazing footage from 7,700 meters. More fish than we or anyone in the world would ever have thought possible at these depths,” says project leader Alan Jamieson of the University of Aberdeen’s Oceanlab, on board the Japanese research ship the Hakuho-Maru.

“It’s incredible. These videos vastly exceed all our expectations from this research. We thought the deepest fishes would be motionless, solitary, fragile individuals eking out an existence in a food-sparse environment,” says Monty Priede, director of Oceanlab.

“But these fish aren’t loners. The images show groups that are sociable and active — possibly even families — feeding on little shrimp, yet living in one of the most extreme environments on Earth. All we’ve seen before of life at this depth have been shriveled specimens in museums. Now we have an impression of how they move and what they do. Having seen them moving so fast, snailfish seems a complete misnomer,” he added.

Although some species of snailfish live in shallow water and even rock pools, the hadal snailfish are found exclusively below 6,000 meters. Here, they have to contend with total darkness, near freezing temperatures and immense water pressure — at this depth the pressure is 8,000 tons per square meter, equivalent to that of 1,600 elephants standing on the roof of a Mini car. They feed on the thousands of tiny shrimp-like creatures that scavenge the carcasses of dead fish and detritus reaching the ocean floor.

Hadal snailfish live only in trenches around the Pacific Ocean, with different species confined to each region: the Chile and Peru trenches off South America, the Kermadec and Tonga trenches situated between Samoa and New Zealand in the South Pacific, and trenches of the North-West Pacific, including the Japan trench that Priede’s team is currently investigating.

The work is part of Oceanlab’s HADEEP project — a collaborative research program with the University of Tokyo — devised by Priede to investigate life in the hadal region of the ocean, which is anything below 6,000 meters down. Program leader for the project is Professor Mutsumi Nishida, director of the Ocean Research Institute at the University of Tokyo.

The project has been funded by the Nippon Foundation in Japan since 2006 and by the Natural Environment Research Council since 2007. The latest cruise to the Japan Trench started on September 24 and ended October 6, 2008; it was organized by Asako K. Matsumoto, HADEEP research manager. This particular cruise was funded by the Nippon Foundation, via the University of Tokyo.

The deep-sea equipment needed to survive the extreme pressure at these depths was designed and built by the Oceanlab team specifically for this mission. The submersible camera platforms, or “landers,” take five hours to reach the depths of the trenches and remain on the seafloor for two days before the signal is given for them to surface.

The team has been keeping an expedition blog, exclusive to Planet Earth Online, a daily news site from the Natural Environment Research Council. The magazine Website includes video footage and photographs of the expedition as well as blogs.

Watch video: Liparid fish feeding at a depth of 7,703m (15 sec)

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