Hey, See Koi-
I got this link, probably from here and probably from Bekko, but I don't remember.
http://www.efreeman.demon.nl/spawning.html
You could try manipulating temps and day length with heaters and programmed lighting to fool your fish into thinking they were ready. Where you going to put the fry?
You could try talking nice to her if she's pretty and over 18.
Mickey the windwoman