I found this interesting article on the New Scientist on how fish deep reef fish can see each other in the absence of red light. Seems there is flourescing of red colors well below the depth where red lightwaves are absorbed. Take a look at the article and enjoy the video!
[...] Seeing Red: How Fish Keep Tabs in the Deep, April 2 [...]
[...] Seeing Red: How Fish Keep Tabs in the Deep, April 2 [...]