Guess what? One of the world’s largest animals can glow in the dark

By Harriet Piercy

Published Mar 13, 2021 at 10:00 AM

Reading time: 3 minutes

15671

According to a study conducted by marine biologist Jérôme Mallefet, three specific species of sharks can glow in the dark. I know what you’re thinking, ‘sharks that glow in the dark?’, get outta here. But no, it is true my friends. And yes, they are just as beautiful as you can imagine. What are these magical creatures, why have they only been discovered now, and how exactly do they glow?

The kitefin shark (Dalatias licha) is approximately the size of your average guitar. In normal light it has a brownish-black skin, with large and slightly googly eyes. But turn the lights off, and it emits an almost translucent and ghostly blue glow. On a 2020 voyage near Chatham Rise, which is just off the coast of New Zealand, a team of international scientists discovered that not only the kitefin shark, but two other species of deep sea sharks have the same gloriously bioluminescent traits. The blackbelly lanternshark (Etmopterus lucifer) and the southern lanternshark (Etmopterus granulosus) have been added to the list, although the kitefin shark takes first place for being the largest known vertebrate to produce such a glow.

The three sharks inhabit the mesopelagic zone of the ocean, which is also known as the twilight zone, and ranges from 200 to 1000 meters in depth—so obviously not a whole lot of sunlight can flood that range, providing an illuminated glow instead. According to Mallefet, most marine organisms that produce bioluminescence contain special chemicals, including a compound called luciferin that interacts with oxygen to produce light. Jellyfish, squid and algae (which are not vertebrates) for example, also enjoy luciferin. But these three shark species do not appear to contain the same chemical properties, so their ability to emit light “remains enigmatic.”

In an interview with Mongabay, Mallefet said that “For the moment our conclusion is that, maybe sharks have a new component that is unknown, But we don’t know.” As anything in nature, everything has a purpose, which is not only beautiful but inspiring when compared to how humans have evolved enough to take advantage of their surroundings.

With humanity set on living in the stars, we have neglected much of the vastness that Earth has to offer. Mallefet continues by explaining that “Many people say the deep sea is less known than the surface of the moon. We hope by highlighting something new in the deep sea of New Zealand—glowing sharks—that maybe people will start thinking we should protect this environment before destroying it. I hope the new generation will carry that message.”

View this post on Instagram

A post shared by Science by Guff 🧬 (@science)

Bioluminescent sharks emit light from specialised cells on the surface of their skin known as photocytes, but exactly how they do this has long been a mystery, however, the study that Mallefet and his colleagues conducted shows some interesting data: the species control their light emissions using hormones. The luminescence is turned on by melatonin, which in humans, is there to help us effectively mediate dark signals and provide night information. Melatonin has been described by the Psychiatric Times as a “hormone of darkness” rather than the ‘hormone of sleep’ we all hear about. It has also been thought to be an endogenous synchroniser that stabilises as well as reinforces various circadian rhythms in the body—the same goes for all mammals, but sharks however are of the Chondrichthyes class.

So why do sharks, among other creatures, have the ability to light up in the first place? Well, in the deep sea, scientists estimate that around three quarters of all creatures living there are bioluminescent, which in the context of darkness, can be extremely advantageous. Need I say more? I will anyway, because it’s fascinating.

Deep sea animals use this special power to do everything from attracting prey and deterring predators to using it as a means to camouflage by hiding their silhouettes to match the light around them, in turn becoming practically invisible to those big bad scaries lurking below. This trick is called counter illumination.

In the case of sharks, known as the biggest and baddest of many, the fact that there might be something after them too for supper remains a possibility. However, because of the dense concentration of photocytes that were found on the dorsal fins of the kitefin sharks, there is speculation that it might simply happen as a way to help sharks communicate with each other.

For now, it’s important to know that these creatures and their habitats are understudied, and under threat. “A lot of people know that sharks can bite, thanks to Jaws,” says Mallefet, “but few people know that they can glow in the dark.” Now for a second, look down at your hands and skin, and imagine how truly remarkable this really is.

Keep On Reading

By Abby Amoakuh

Campaigners call for gamers who carry out virtual rape in the metaverse to be charged as real-life sex offenders

By Eliza Frost

Bad Bunny announced as halftime act for Super Bowl 2026—and conservatives aren’t too happy 

By Eliza Frost

What is Banksying? Inside the latest toxic dating trend even worse than ghosting

By Eliza Frost

Is the princess treatment TikTok trend the bare minimum or a relationship red flag?

By Charlie Sawyer

McDonald’s hit with new mass boycott. Here’s who’s behind it and why

By Fatou Ferraro Mboup

Conspiracy theorists are convinced Blue Origin’s all-female space flight was fake

By Fatou Ferraro Mboup

Kim Kardashian’s Paris $10 million heist: grandpa robbers tell all as trial begins

By Eliza Frost

Is Belly Conklin the problem in The Summer I Turned Pretty?

By Charlie Sawyer

New study confirms Bacterial Vaginosis can be sexually transmitted, backing what women have long suspected

By Eliza Frost

Controversial American Apparel owner just opened LA Apparel in NYC and TikTok girlies are flocking to shop

By Charlie Sawyer

UK women who miscarry could face home and phone searches following new anti-abortion police guidance

By Charlie Sawyer

How rediscovering Nintendogs as an adult has helped my anxiety

By Charlie Sawyer

Transformers director Michael Bay officially confirmed to direct movie about viral Skibidi Toilet meme

By Abby Amoakuh

Right-wing Christian podcaster claims that airport body scanners can turn you gay

By Charlie Sawyer

This Oscar-winning actor is the top pick to play Voldemort in HBO Max Harry Potter reboot

By Fatou Ferraro Mboup

Jeffree Star makes inappropriate comment after Kanye West posts disturbing incest confession

By Abby Amoakuh

John Lithgow fumbles JK Rowling question as Harry Potter TV show cast struggles with fan backlash

By Eliza Frost

We finally know why Conrad and Belly broke up in The Summer I Turned Pretty season 2

By Charlie Sawyer

Australian actor Joseph Zada cast as Haymitch Abernathy in upcoming Hunger Games prequel

By Charlie Sawyer

What is Mar-a-Lago face? Unpacking the beauty trend prompted by Donald Trump’s second term