I'm not that knowledgeable, but I know the following...
1. I've never lost any bluegill to my knowledge from cool water hauling over short distances. I've hauled them all the way down to 32 degrees. They were laying almost flat on their sides on the bottom of the tank and all recovered nicely, but this was only for about three hours.
2. My striped bass hybrids were transported in really cool water, and many developed a greenish fungus and died.
