Is this real or has someone photoshopped that together? It looks stunning either way.

lol it looks fake mate
i have been using photoshop for several years now and i think its photoshopped
as you can see the fish looks like its above the water rather than under it and the shadow is different to how a fish's shadow would look if it had been distorted by water.

in my opinion its a fake

Yeap, looks like it is photoshopped. It looks like its above the water and I dont think a koi would swim near those pebbles as it would get struck.

it's negative color

Blue Koi are called Asagi koi. It isn't a true blue, its actually black pigment that is deeper in the skin of the fish, showing as a blue color. I have seen fish like this in real life, but I think that saturation on this pic was boosted alittle. They are very expensive, I have 2 of them that I am looking at to purchase, about 7 inches long and they cost 300 each.

My koi "beach" themselves all the time to eat.

it could be real but it looks like its photoshopped.
but there are actually blue koi`s they are very rare
like 5 out a millon. and they are conciddered as waste.
and turned into food or whatever. so you wouldn`t find one
that easy maybe if you ask a breader in japan :P

and to john a asagi isnt blue there main collors are orange/white/grey