So you’ve decided to raise koi fry. Congratulations! You’ve officially moved from “koi hobbyist” to “koi parent,” and your pond just turned into a tiny, flippy, wiggly daycare center. Raising koi fry is one of the most exciting (and occasionally nerve-wracking) adventures in koi keeping — full of tiny miracles, big learning moments, and the occasional “what on earth is THAT one going to grow into?”