From around the world, some FYI for those who think prolonged air exposure has no effect:

http://www.asf.ca/release/science2.html#airexpose

http://www.fisheries.nsw.gov.au/science/projects/maximising_survival.htm

http://www.agfisch.ch/doku/literatur/af_cooke.htm

Plain and simple, you never, ever have your released fish out of the water for more than a few seconds.