Patterns of glowing sharks get clearer with depth

Catsharks are not only able to see the bright green biofluorescence they produce, but they increase contrast of their glowing pattern when deep underwater, new research concludes. The study, conducted with a custom-built ‘shark-eye’ camera that simulates how the shark sees underwater, shows that fluorescence makes catsharks more visible to neighbors of the same species at the depths that they live and may aid in communication between one another.