Sorry about that! I haven't lost a koi in a while, and I hope I don't. The only import I ever got was a 5" ginrin bekko. For some reason, after 6 months in the pond, it couldn't close it's mouth. Must have been a tumor. I couldn't catch it for the life of me (around 3 years ago). One morning, my wife found it dead.
Hope you get a nice one from your spawn!