I've seen some people that net their fry or very small fingerlings every couple or few days. On another forum, there is a hobbyist that is working on Goshiki and he pulls the koi frequently (every couple or few days) to take pics. For some reason, to me, this seems like it may inhibit growth, but I don't know. I would think that this would increase stress and potentially limit or retard growth. I know that some breeders/dealers will not even bowl a koi after it's eaten as it may cause an upset tummy. Don't know if this relates to fry necessarily, but I would think that minimizing bowling any sized koi is a good thing.
Any thoughts on the matter?