yes they will breed in the pond all on there own and they will mix,my mother in laws pond she does nothing at all for breeding and she gets a hand full of them every year ans some really nice ones to,if you could gather eggs on mops or something im shure you could have tons of them,they like to eay eggs as fast as they lay them,now in my pond they havent breed yet hopefully soon and might try to save alot of here eggs this year because you cant miss it when its happening in the pond good luck 18 fisher