I have heard from several sources there are even videos on you tube on the subject. That when catching "large" "Hawgs" and they are drug up from the bottoms pretty fast that when released they will swim off and seem to be fine but only to die later. Something to do with the air bladder and change in pressure from bringing them up so quickly from deep water. Take a small PVC pipe a couple feet long and gently push down the hatch and into the stomach and the fish will actually "BURP" out the PVC pipe sounds just like you or me belching. And supposedly this "saves" the fishes lives. I was just curious as to how much truth there is to this and are there any of us who practice this method ??? Just looking into because what good is CPR of Huge Old Catfish if we are releasing them only to die later. And we all want to keep the big boys alive. So any thoughts on this subject.