catshark

David Gruber / iScience

Scientists have worked out why certain shark species glow green at the depths of the ocean.

Only blue light can penetrate this far down, which makes the swell shark and the chain catshark glow in the dark.

Scientists from City University of New York and Yale University looked at the biology of these sharks, and found that they have a particular biofluorescent molecule.

It’s a different form of bioluminescence to what is seen in other animals, like certain jellyfish and corals.

“Sharks continually fascinate humans, and they hold so many mysteries and superpowers,” said co-corresponding author David Gruber. “This study highlights yet another mystery of sharks, and it is my hope that this inspires us to learn more about their secrets and work to better protect

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