1. If you use one, use the back of a gaff.
2. Find a "long" rock, and you can use it like a club.
3. Make the hit like you would to "slap" it, but have a rock in the palm of your hand.
This works for pinks and coho, but i guess if you found a big enough rock, it would still work. A thich brank can work too.
Once the fish is "stunned", you'll see the pupils dialate, this is the most obvious indicator, cut the gills immidiately after, to cleanly remove the gills, make a cut with a knife at the top of gills, and then pull them, at the bottom, you can cut both sets of gills out with one cut, and sepparate the lower jaw from the rest of the body. This will ensure proper bleeding as the heart will still be beating and pump out a lot of the remaining blood in the animal's system, and it makes somewhat of a handle for carrying the fish around

. Let it sit for ~15 minutes, gut the fish (my friend to gills with the knife), and pull EVERYTHING out (just to warn you, the heart would still probably be beating after removal, something the kids may find interesting is that if it stops, you can flick it and it starts up again...). Make sure you get the kidney that runs the length of the spine, use the tip of the knife to cut the membrane encasing it, use the butt of the knife to scrape out ell the black/red junk. The fish should now be relatively clean, wash out the remainder of the blood and other crap and stuff the entire body cavity with ice if you have it.
I've heard of people fishing all week end and not catching anything and the when they finally get one, they punch it to death, quite a spectacle to see.

This is just for salmon, anyone ever tried to kill a halibut and have it die on the first hit no matter how hard you try !?
