I am a new pond owner (8500 gals) and purchased my koi by what I found to be appealing, long before I knew about all the names and heredity etc. Now I am curious. I have researched and believe that I have identified most of my fish except for my butterfly. Can anyone help me. It doesn't show well in the picture but the top of the fish has a light blue hue. I know it is Doitsu. but that is about it.