I dont think that right now the fish is stressed... this fish has came from very poor conditions and this is probebly the cause for this situation. but right now i dont think stress is the factor, i think this disease has already took hold and it should be treated. moreover i dont see any cause for this fish to be stressed.I dont think its mouth rot either.. i never seen a case of mouth rot looking like this. I read about a disease that attacks catfish called ESC,does somone heard about it?