Fish poison
by Jeremy
(United States)
Green walnut hulls crushed make a good fish poison and it does not kill the fish just temporary stuns them. They will float to the top of the water. The hulls are the best to use from this tree but the green leaves crushed work as well.
Another one is the berries of the poke sallet plant. If either one of these are available they are good methods of catching fish without a pole.