A biofluorescent chain catshark (Scyliorhinus rotifer), one of two sharks known to biofluoresce. Special proteins in this shark's skin absorb blue light — the only light that penetrates to depth in the ocean — and transform it to a shorter wavelength, resulting in green coloration.
New research published in Scientific Reports finds that sharks can see this fluorescence and that the coloration makes them more visible in the dark blue light of the ocean. Researchers have yet to learn if the sharks use the color to communicate or how. Here's a look at the amazing sharks and their glowing patterns.
Swimming like a shark
Swell Shark at Home
A swellshark under white light in Scripps Canyon off of San Diego, where divers took their shark-eye camera to investigate how catsharks like this swellshark see in the blue light of the ocean. The sharks can see very well in low-light, but don't see in color. Their eyes detect colors on the cusp between blue and green wavelengths, which means they can see each other's green fluorescent skin.