A couple of years ago while we were diving in the Caymans I was introduced to bio-flourescence. Prior to that trip, I had been on a number of night dives over the years so I was accustomed to the thought of turning off all of the dive lights and moving your hands about to stir the water to see plankton luminesce or glow in the dark. Okay it was interesting but that was about as far as I got.
Bio-luminesce seemed to be different. Instead of turning off all of the lights we added a blue light, not black light as we all saw in our youths. We added some yellow filters and blue light filters for my strobes. Voila certain critters changed colors and glowed in the dark.
Giant anemone under blue light
So I was no longer looking at pint sized critters who glowed for a moment or two; now I was looking at much larger corals and creatures that glowed green or other colors, as long as I turned the blue light on them. Cool. What appeared to be the difference between bioluminesce and bio-flourescene was the use of blue lights which which would cause a glowing for more than a few seconds.
After thinking about it for a while, I began to wonder if there was any practical applications for being able to see bio-flourescense. Turns out there is. From my readings it appears that the proteins that glow under blue light can be useful in helping to identify cancerous cells. Hmmm that is kind of interesting. It also turns out that when blue light hits juvenile corals it also glows. Now I am not a scientist, but it would seem to me that that type of information would be useful in identifying whether new corals are growing on a reef or not. Turns out there is some research being done along the lines of using blue light to identify new growth coral. Now that seems to me would be useful in helping to identify whether a reef was growing with new corals, was stagnat or dying. I could see if studied under controlled conditions it would be very useful to identify the health of at least the portion of the reef which would bio-flouresce. I suspect there are still more practical appications for blue light underwater than have yet been considered. So maybe blue light will unlock even more secrets of the oceans and nature and is more than just a cool sight.
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There are indeed more applications to underwater fluorescence besides those you named, for example testing offshore pipelines for leaks, marking and finding back specific spots underwater (e.g. for follow-ups on coral health and development), for finding back lost dive gear (if marked with fluorescent paint, e.g. Scuba Goop, Trident, Fastencil etc., which is a good idea anyway e.g. to prevent other people from accidentally packing your stuff into their bags), and there is also research going on about fish and other critters using fluorescence to secretly communicate with each other (see e.g. Nico K. Michiels et al., “Red fluorescence in reef fish: A novel signalling mechanism?”, http://www.biomedcentral.com/1472-6785/8/16/abstract).