Sorry to have been obtuse. Re using rocks and sticks to beat fish to death in shallow water: don't - even if it works it is a low percentage ploy.

The damage to the fish you don't kill, damage to the flesh of the fish you do kill, extended energy-draining time in the water getting cold and dirty for little return, possibility of injury to yourself as you trip through the stream or river, large amount of disturbance of the environment in terms of stream bottom, ambient noise, etc. all make this a low-on-the-list survival choice.

Instead, do what gives you a high percentage chance of repeated success with a both migrating and non-migrating fish for a relatively limited resource investment. [Rock traps are just one solution - as none of the gutenberg stuff looks to be to me. You of course have, for example, one larger, mini-gaff size hook in your survival fishing kit that can be lashed to the end of a branch and used to snag fish for a one-time solution in the unlikely school-of-big-fish-in-shallows situation.]

When you have a fish "in hand" dispatch it with a smack to the head - your choice of a stick or a rock.