I have done this as a child.We fished for Bass in a stream,with a Garand and purposely shot next to the fish so the concussion would stun them.If toy hit the fish,there wasn't much left to eat.
Also,my father used to fish empty handed in rivers/ponds when he was a young man.I have never seen it, but other people told me it was true.He would go swimming with friends at night and feel the small "caves" on the side of the stream, and stick his hand along the side looking for "sleeping" fish.
He would then grab it and pull it out alive.Now and then he would find undesirable things like snakes and turtles,but it seemed to be part of the fun.
Hard to believe,but I am assured it was true.I know in the south they do this with catfish,but this was Bass,much smaller than the cats they catch down south!