Fluorescent sharks have been filmed by researchers diving in the Solomon Islands
Researchers studying fluorescing corals have discovered sharks that glow in the dark - and fish and stingrays too. They found 180 species that fluoresced, absorbing blue light and reemitting it in a variety of colours - such as the neon green of the catshark.
The divers dived at night and used blue-light torches with yellow filters on their masks to see he phenomenon.
"We were completely surprised to find how widespread [this ability] was," said David Gruber, a marine molecular biologist at City University of New York. It's not clear yet why fish do this.
The findings were published in the journal PLUS ONE.