^^^ Nevermind. A quick Google search found as many as I'm willing to pay for.
I thought I had seen paddlefish (a while back) in the "fish listings" for some suppliers.
I assume they wouldn't stock them if they didn't have some reason to tell pond owners how they would provide a benefit to the pond?
Do paddlefish stir up the bottom to filter feed, or do they just cruise through the water column and actually clear things up?
I have seen oxbows of rivers that stayed murky for weeks after any floodwaters entered. They were full of trash fish, such as carp, buffalo, suckers, and drum. I don't know which of those stir the water the most, but some fish were keeping that water constantly churned!