I am a tourney director and we just fished a tourney yesterday and had 1 questionable fish out of say 10 limits, the problem there was degassing (as mentioned before) we degassed the fish and I worked him in my livewell with U2 oxygenator additive (I don't have a oxygenator just the additive) for 45 minutes cooling him down and I am happy to say he swam off will no problem.

97 degrees, tournament properly looked after, ZERO dead fish....... priceless