Primitive Technology: Big Fish Trap in The Forest

I built a fish trap from bamboo in the forest. Then I caught a big fish and ate it. The trap is shaped like a hopper and is placed upside down so that when the fish catch it will not swim back due to the resistance of the water. I stacked rocks to stop the water , leaving only a small slit set traps.The water that flows through the trap will be very strong so the fish will not swim backwards.To cut bamboo and fish, I use rock fragments with sharp edges.
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