I know I'll stir up the stink a little with this answer and we will never know if this is accurate. But I bet that the average catch and release fisherman and especially tourney fisherman who catch (often bedding bass), release and cull multiple times thru the day and haul the fish to be weighed and released often miles from "home" end up killing more fish than the meat eater who catches his or her 5 and goes home with them. I own a pond in which I let good fishermen fish and release and very seldom are there not a couple nice ones floating the next day. In the hot summer, in warm water, delayed fish kills are terribly under reported. Most, the turtles get before you ever even know they died.