Thank you for the insight and illustrations Greg. I guess I will be into koi pornography too when I net a few of my koi tomorrow and start milting them.
Hopefully my wife will be willing to participate and take some pixs as my hands will be busy handling these koi.
On a side note, I was at a dealer's place a week ago and he bowled up several potential nisai (born spring of 2006). I asked him if he could tell me what their sex were and, in addition to doing other things, he starting milting them. Of the 5 koi that were in the bowl, none of them produced any milt. Well, I purchased 2 of them and, if you are right Greg, they must be females!!!