unripened Black walnuts have a nerve toxin in the flesh covering the shell, if you cut into them in several places and suspend them in the water the toxin will paralyze the fish causing them to float to the surface.Must know. Why green?
old native American trick.
Illegal but useful in a survival situation.
The fish are safe to eat as the poison binds to they're blood.
The poison is called Juglone.
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