Yesterday we caught a 3-4 lbs blue in about 65 feet of water. On heavy tackle it didn't take long to bring him up. Once in the boat it was apparent something (air bladder?) was hanging out it's rectum. Once the fish was returned to the water it floundered on the surface unable to dive. I don't keep any fish and would just as soon not kill a future trophy. Is there anyway to prevent injuring the fish when fishing deep water. Chris Harris once told me he carries a length of PVC pipe to jam down their throats to "burp" them but he also mentioned their bladder would be sticking out their mouth not the other end? Any help would be appreciated.