I frequently keep brook trout from Elbow Lake, mainly because there are so many of them and I love camping there. The lake is overpopulated with little brookies, and they're all competing for what limited food is up there. This is one of the lakes that has a catch limit of 5, but you rarely get anything over the 10" range. If I catch an edible size brookie, I put two fingers under the jaw, and my thumb behind the top of the skull and pull back until I hear a crack. All they have up there are large sharp rocks, so bonking would get a little messy.
After cleaning out the guts and cutting off the head, I just throw them in a pan with some butter, garlic, and seasoning salt. Sometimes I add a splash of beer. Squirt some lemon juice and enjoy!
I have a pic of my little setup, but my photobucket account got nuked recently.