Don't forget rocks, rubber, and an occasional bird:) I think we are just coming at this from slightly different perspectives. I look at CC eating fish and crayfish as impacting other fish that are primarily predators (like LMB and SMB). The degree of competition that someone is concerned about may vary from person to person. I am reserving my 3rd pond for some blue catfish to hopefully partially control black crappie (along with fishing), but need a good forage base and more plant cover before adding either of these species. No CC anymore in my SMB or LMB ponds.