Read the OH regs, often times private enclosed ponds are exempt from many restrictions and rules that open private ponds or public waters must adhere to. Paddlefish can do well in a moderate to larger size pond if there is enough food source available to them. If you wanted to add one of two as a conversation piece thoroughly research the laws and then possible implications of them being in your pond. Paddlefish feed mostly on zooplankton, the same food many young game fish feed on so keep that in mind. They need large flowing rivers to spawn, so them spawning in a pond is not going to happen.
