The background image for this composite was a 4 second shutter speed shot of the bubbles coming up from an aerator. This is done with a boom and a counterweight, once in place it holds still enough to function like a tripod for long exposures. I masked this Paddlefish from another image shot with flash. The mask and merge didn't work perfectly, so I ended up using white balance to cool the whole image into a blue that made them fit better. I was surprised to see it place, the Paddlefish is not as sharp as it could be, and the mask is not good because the contrast between the fish and the water in the original image is minimal. The panel may have been influenced by the degree of difficulty or the rareness of Paddlefish images.
From CNC Natural Pool- Underwater Photo Studio