Reefs are aglow with fluorescence!
What is fluorescence?
Adam Blundell, M.S. writes about 'The Seen and Unseen World of Coral Fluorescence' in Advanced Aquarist's June, 2005 issue:
Fluorescence is a process whereby a matter of energy is absorbed by a substance, and then released by that substance with less energy. In this case a light source of high energy (lets say blue light) is absorbed by a substance (a coral) and then released with less energy (i.e. green light or red light).
Dana Riddle writes what may be the most comprehensive series of articles on coral coloration & fluorescence:
Fluorescence in Fiji
This summer, a team of scientists set out to Fiji to capture the amazing fluorescence of marine life in the wild using blue lights and special filters. Here are some of the photos they reported back via National Geographic.
Special underwater photography equipment is used to capture fluorescence. (c) Keith Ellenbogen
We all know Acropora can fluorescence ... (c) Keith Ellenbogen
... but did you know fish can as well?! (c) Keith Ellenbogen
Chitons too! (this time in red) (c) Keith Ellenbogen
The sea is teeming with fluorescence! (c) Tali Treibitz