Why is my koi or pond fish hanging out by itself in my pond?

We all love our pond fish and koi!  They swim about together, greet you at the surface for some food, and swim gracefully creating a calm respite for us to relax.  You may have experienced going out to your pond and seeing one of your pond fish or koi not hanging out with the others and just sitting by itself in a corner with its fins clamped to it's side.   It almost seems as though it's in TIME OUT.  If you have or do experience this, it's a time to be a bit concerned for your fish friend.   

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