Pure Oxygen is better than just air.

We need some others to chime in but here are two points:

1) Put some water in some plastic bottles and freeze them. Throw one in the water holding the fish, and it will keep them cool (ice would melt and mix the ice water with the fish water). Don't over cool the fish though; you should have some kind of water thermometer so you can gauge water temps in your transport tank and your pond. You will want to equalize with in 2 degrees or so.

2) Salt is good to help the fish. Someone needs to chime in with what kind of salt and how much.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."