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Trevor, there are many phosphorescent creatures in sea water. I've gone scuba 
diving on a moonless night and we played like wizards in Fantasia throwing 
fireballs as we moved when the dive lights were off.

But in answer to your direct question as to whether sea water itself emits 
light...The general answer we learned in oceanography is "no". Seawater does 
not glow at all, by itself. From physics and chemistry you can learn that 
there is some tritium in all water, and tritium does glow, but if you could 
never see that emission in normal seawater.

All you will see are the critters glowing, as they do when they are disturbed 
in any way. From "sparks" to "worms" and "blobs", but all critters, never the 
water itself.

   

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