While camping at the lake this weekend, my boy and I were swimming during the afternoon, and noticed a large catfish floating around. We went over and dragged him to shore. I took pictures of him and will post them when I remember to bring the camera to work. He did not have any apparent injuries, that I could find, and looked plenty healthy. Looked to be dead about 6 to 8 hours, was not stiff yet. He was very fat, although that could have been some bloating going on. I am almost positive he was a blue, but not 100% (what is the best way to tell for sure by the way?) We tried to weigh him, but the scales we had only went to 20lbs, and he maxed them out before he was even off the ground. He was probably between 36 and 40" long. Any ideas on what could have killed this big boy?? I thought it might have been a boat prop or something, but like I said, I could not find any injuries to him. I just don't know.