I have never seen a perruno. IMO they do not exist. It could be one of the scientific slip ups. Supposedly they only come from one small region in SA, yet most of the "perruno's" are farmed. Perruno's have different external characteristics and I have NEVER seen any of these characteristics on any "marbled catfish." They are for the most part L. marmoratus aka L. longibarbus I will upload pics of my 16" soon.