Stihlhead, From the Catch & Release Foundation Web Site, I would suggest reviving the fish with it's head facing upstream and let current move the water through it's gills, if possible, in clear water-

MMTo revive the fish, hold it under the belly and by the tail, keep it in an upright position underwater, do not move the fish back and forth** (this is also a good time to get a measurement and take a photo). If you are fishing in a river or stream, hold the fish facing the current. Be patient and give the fish as much time as it needs to recover and swim away on its own.

**There is a currently difference in opinion amongst the experts about whether or not to move the fish back and forth when reviving. We will keep you posted with any statistical information as it comes available.