i dont know if catfish are stocked. but if they are i agree that would be the easyest way to do it. if you cant buy them there are other ways. the catch somewere elce and reliece in your pond will help. another way i can think of is. when i was a kid i remember swimming in newfound lake hear in NH. in the summers i would se black spots one the bottom of the lake in about 3 ft of water. when i stuck my head under i would find that the black spots were a small swarm of hundereds of baby cat fish. smaller than tad polls all together. at this point i could turn over rocks in our jettys and find and catch them there by the dozens. mabee you could use that way to catch tons of them for your pond.