A prawns segments overlap the ones after it whereas a shrimps second segment overlaps the first and third segment. Shrimp have a distinct bend in the tail. It is definitely not a crayfish however which is basically a freshwater lobster.
This method of catching prawns is easy with the only skill needed being basketry. In practice, a long stretch of creek might have several traps collecting food each day without any effort on the part of the fisherman. Bait is not necessary to catch prawns as they will be naturally be drawn to the fish trap out of curiosity. But scraps from previous prawns may be used to bring in new ones (they are cannibalistic) or other fish like eels. The prawn trap is easy to build and can be reused many times.
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