Photos: Catch a Glimpse of the Reclusive Glowing Green Eel

A serendipitous photo taken during a scuba-diving trip in the Caribbean clued researchers into the world of a mysterious green and glowing eel. Though the green eel species is known for being shy and reclusive, divers managed to catch two and examine their glowing properties. An analysis showed that the eels have a completely newfound class of fluorescent protein that needs bilirubin to glow. These proteins likely helped shape the eels' evolution, and may help researchers develop new techniques in the lab.  [Read the Full Story on the Glowing Green Eel]

Serendipitious photo

This biofluorescent green eel (lower right corner) surprised scuba-diving scientists, and prompted them to study its glowing proteins. (Image credit: Copyright Jim Hellemn)

Green science

The green eel Kaupichthys hyoproroides that was collected in the Bahamas. Typically, researchers collect dozens if not hundreds of specimens for research, but the scientists on this study decided to collect just two. 

"We're trying to be as non-invasive as possible when we do sample," said study lead researcher David Gruber, an associate professor of biology at Baruch College in New York City. (Image credit: Copyright David Gruber, John Sparks and Vincent Pieribone)

Fluorescent protein

The new eel fluorescent protein expressed in a human cell line. The protein needs bilirubin to glow, the researchers found. (Image credit: Vincent Pieribone)

Close up 

A close up photo of the glowing eel. (Image credit: Copyright John Sparks, Vincent Pieribone and David Gruber)

Aglow in the dark

In the past few years, researchers have realized that fluorescence is more widespread in marine life than previously realized. These animals biofluoresce by absorbing the blue light available in the ocean and reemitting it at a longer, lower energy wavelength, such as orange, red or, in this case, green. (Image credit: Copyright John Sparks, Vincent Pieribone, David Gruber)

Glowing creature

It's not yet clear why some marine animals fluoresce, but it could be used for mating, predator avoidance and prey attraction. Researchers can also use the fluorescent proteins in biomedical experiments, such as observing chatter between nerve cells in the brain. (Image credit: Copyright John Sparks, Vincent Pieribone and David Gruber)

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Laura Geggel

Laura is the archaeology and Life's Little Mysteries editor at Live Science. She also reports on general science, including paleontology. Her work has appeared in The New York Times, Scholastic, Popular Science and Spectrum, a site on autism research. She has won multiple awards from the Society of Professional Journalists and the Washington Newspaper Publishers Association for her reporting at a weekly newspaper near Seattle. Laura holds a bachelor's degree in English literature and psychology from Washington University in St. Louis and a master's degree in science writing from NYU.