Many threads here on fish coloration. It changes fast so it is not a real good indicator to shoot for. Best to try and look at color in the pond via camara and not in fish that have just been caught. The threads referenced above have some good pics and discussion on traits. I have no idea how you try to produce fish with just the genetic traits one might want as there are thousands of interrelated traits some dominate and some recessive. George and I tried (along with others) in the Ark CNBG thread to describe what we thought we knew.