Mystery Koi in a New Spring-Fed Pond: How Did They Get There?

Natural Colonization Routes

1. Human introduction: Neighbor, kids, previous owner.
2. Bird transport: Eggs on heron feet/feathers or in gut.
3. Predator drop: Heron/raccoon drops live fish.
4. Stream connection: Temporary overflow from a stocked waterbody.

Most Likely

Human introduction or bird transport. Eight-inch koi are too large for recent bird drops; someone likely stocked them.