Two important points that all trout anglers need to consider:
1. Don’t move the fish back and forth in the water while reviving it. This has the opposite of the intended effect. I see a lot of anglers doing, working on the assumptrion that the forward motion forces water through the gills. Trust me: the fish can move the water through its gills by itself.
2. Keep your fingers away from the gills and eyes. I receive a lot of photos in which an angler is holding a trout incorrectly, with one or more fingers in the gills.