UCLA scientists helping get to bottom of giant fish story

Nov 27, 2013 by Elaine Schmidt
UCLA scientists helping get to bottom of giant fish story
The head of the oarfish. Credit: California State University, Fullerton.

"Wow, that's one big fish!" That was the reaction of everyone at UCLA's Translational Research Imaging Center when a monster fish story became reality in the form of a rare 14-foot, 250-pound oarfish, whose snake-like carcass washed ashore in Oceanside last month and ended up in nine pieces at the state-of-the-art imaging facility on campus.

On Nov. 21, UCLA and Cal State University, Fullerton scientists teamed up to study the big , the second found DOA in Southern California waters last month after the first one surfaced off Catalina Island. A camera crew captured the process at UCLA for an upcoming segment on the Discovery Channel's Daily Planet—the latest flurry of media interest since the giant specimen became hot news around the nation.

Misty Paig-Tran, 32, a CSUF ichthyologist (that's a scholar to you and me), had approached Dr. Dieter Enzmann, UCLA chairman of radiology, with an irresistible offer. Would his department's specialized center perform a computerized tomography (CT) scan on the oarfish? Enzmann enthusiastically agreed.

After all, the oarfish, a mysterious deep-sea species that most likely spawned the sea-serpent legend of yore, was first described in 1772. But it's been poorly studied by researchers and rarely glimpsed by sea divers. Living as deep as 3,300 feet below the ocean's surface, the monstrous fish can grow up to 30 feet long and weigh as much as 600 pounds.

This particular silvery, red-finned specimen offered an unexpected bonus to scientists. Its six-foot-long ovaries were overflowing with millions of eggs, which Paig-Tran's team plans to count and analyze.

Radiologist Michael McNitt-Gray and ichthyologist Misty Paig-Tran position the oarfish for a CT scan at UCLA's Translational Research Imaging Center. Photo by Dave Nelson.

Radiologist Michael McNitt-Gray and ichthyologist Misty Paig-Tran position the oarfish for a CT scan at UCLA's Translational Research Imaging Center. Credit: Dave Nelson.

With expertise in biomechanics, Paig-Tran is teasing out how the shape of the oarfish affects its function. Her goal? To trace the evolution of the fish's Jell-O-like skeleton and unravel how the elusive oarfish can swim upright, with its head aloft and its tail hanging vertically.

"The oarfish hangs motionless in the water for much of the day, except for its continuously beating dorsal fin, which is bidirectional," explained Paig-Tran. In its CT scans, she is looking for clues "that explain why the fish moves its fin this way and how its soft skeleton contributes to its swimming performance."

It's not your typical task at the UCLA Translational Research Imaging Center, equipped with the most sophisticated imaging technologies available. Usually, UCLA scientists at the center are developing and testing new medical devices and drugs prior to their use in human clinical trials. The lab also trains clinicians in new FDA-approved therapies to benefit patients in the fields of cardiology, neurology neurosurgery, radiology and urology. 

In the case of the oarfish, the tricky part for radiologists came in prepping the fish and then transferring the data, a task that took more than 12 hours.

As a fishy odor perfumed the air, Michael McNitt-Gray, a professor of radiology at the David Geffen School of Medicine at UCLA, painstakingly positioned the fish on the center's high-resolution CT scanner.

The head of the oarfish. Photo courtesy of California State University, Fullerton.

Even though it was chopped into nine pieces and frozen for transport, the oarfish was so long that McNitt-Gray could only scan three pieces at a time. The actual scan required only a few minutes.

"I was expecting something unusual, but nothing prepared me for the oarfish's size and unique structure," said McNitt-Gray, a medical physicist who advises numerous national and state task forces on clinical CT techniques.

"Dr. Paig-Tran described the fish's anatomy as it materialized on the monitor before my eyes.  That's what I find so interesting about my work— experts are making discoveries as we scan."

Paig-Tran will use the scans to create a three-dimensional model of the fish and then spend several months dissecting the fish to remove the bone for further study. The findings she gleaned from UCLA's scans will be published in an upcoming paper, but until then, the oarfish's secrets remain buried at sea.

Explore further: New 14-foot 'sea serpent' found in Southern Calif.

add to favorites email to friend print save as pdf

Related Stories

California 'sea serpents' draw gawkers

Oct 22, 2013

The silvery carcasses of two giant oarfish were discovered along the Southern California coast last week, baffling scientists and gaining a growing online following who gawked at the bony, snake-like creatures.

Five-meter sea creature found off California coast

Oct 15, 2013

A marine science instructor snorkeling off the Southern California coast spotted something out of a fantasy novel: the silvery carcass of an 18-foot-long (5-meter-long), serpent-like oarfish.

Bizarre giant oarfish filmed (w/ Video)

Feb 10, 2010

(PhysOrg.com) -- A rare giant oarfish, probably the largest bony fish in the ocean, has been filmed off the Gulf of Mexico. This is possibly the first time the fish has been observed in its natural environment.

Recommended for you

Male monkey filmed caring for dying mate (w/ Video)

Apr 18, 2014

(Phys.org) —The incident was captured by Dr Bruna Bezerra and colleagues in the Atlantic Forest in the Northeast of Brazil.  Dr Bezerra is a Research Associate at the University of Bristol and a Professor ...

Orchid named after UC Riverside researcher

Apr 17, 2014

One day about eight years ago, Katia Silvera, a postdoctoral scholar at the University of California, Riverside, and her father were on a field trip in a mountainous area in central Panama when they stumbled ...

In sex-reversed cave insects, females have the penises

Apr 17, 2014

Researchers reporting in the Cell Press journal Current Biology on April 17 have discovered little-known cave insects with rather novel sex lives. The Brazilian insects, which represent four distinct but re ...

Fear of the cuckoo mafia

Apr 17, 2014

If a restaurant owner fails to pay the protection money demanded of him, he can expect his premises to be trashed. Warnings like these are seldom required, however, as fear of the consequences is enough to ...

User comments : 0

More news stories

Biologists help solve fungi mysteries

(Phys.org) —A new genetic analysis revealing the previously unknown biodiversity and distribution of thousands of fungi in North America might also reveal a previously underappreciated contributor to climate ...

Making graphene in your kitchen

Graphene has been touted as a wonder material—the world's thinnest substance, but super-strong. Now scientists say it is so easy to make you could produce some in your kitchen.