Do any fish actually stir up mud in a pond?

I've seen people blame fish for making their ponds muddy/turbid.  Catfish/bullhead and carp/koi being the usual suspects.  Does anyone here have actual direct experience with this?  As in, you added a new kind of fish and the pond subsequently became turbid? If so, what specific species?

I've watched them do it, if that counts...when I was a uni student there was a massive Amur carp living in a little pond I liked to frequent on campus. It went around like a vacuum cleaner. My great aunt's koi did this as well. I think they're the same species.