Sarah, nice to hear from you, getting a lurker to post brings more interest to this board, plus often a lurker like yourself will ask questions others would like to know about.
I'm pretty sure you may have heard of KHV, a very awful condition that can wipe out a collection of fish in a heartbeat. Since we are now living in a KHV world it becomes very important to do all you can in the way of qurantine practices. The koi you have pointed out is our
resident naive koi that we use to help us identify potential health risks, we call her "Bandit".
She was born from an accidential spawn a about four years ago, found her in a puddle down stream of our pond where we backwashed. Was living in this puddle all summer, picked her out of the mud and has since been living the life of luxery in our chambered filter and now our QT pond. Have tried to net her, you would think she had wings, maybe four feet in the air on about three different tries. She is really friendly, greets new arrivals in our QT pond and has a settling down attitude that helps our new koi adjust. Sharon loves to hand feed our koi worms, she will jump in front of much larger koi and beat them to those kind of snacks, hence "Bandit". I would guess she is a Heinz 57, maybe more sanke than not, but from Magoi blood line.
Thanks for asking