Koi eggs are very small, smaller than frog eggs, usually milky white to clear in color and typically not perfectly round. They stick to everything and the koi usually gobble them up before they hatch. Have no idea if what you have are baby koi.. the adult koi will eat the babies as well. If the babies develop most will probably be koi mutts as with most cullings I think like 90% or so are destroyed. I just had my koi lay eggs but I couldnt get to any of them as my water is cloudy from all the rains and from my new filter media. I caught most of my koi gobbling them up, hopefully because my water is cloudy maybe some might make it but I wont know for a while. If I did find babies I would take them out and put them in an aquarium until they can get some size to them.. Would have to look up which is male or female cant remember off the top of my head, has something to do with the lower fins, maybe some one here knows.. hope that helps some..

Unlike goldfish, koi hatch colored but the colors change a lot as they grow. Shubunkin goldfish also show colors as fry but the rest start out blackish. If all you have in the pond are koi then koi fry are what you are seeing.

Koi breeders cull most as only a few are the beautiful fish offered for sale at high prices.