oh, I see now. I would not care if the fish went to another pond, but I would not give them to a pet shop. They would basically be going from a huge pond to some kids 1/2 gallon bowl where it will be slowly killed.... not too keen on that. I would rather euthanize them quickly and be done w it. Basically goldfish are not aquarium fish and should only be kept in ponds where they have room to actually live. I did not know that about the catfish, but I think they do get large and then wouldn't they eat my goldfish? I guess they would do ok w the koi as they get larger of course. I have still counted about 20 small babies in my pond even after catching 40ish.