This is a step-by-step of the Tarantula Prawn fly that I, based on Neil Rowe’s experience with tan EP fibre prawn imitations, used very successfully to fool spotted grunter and steenbras (see: Prawns in Tandem) in a Western Cape estuary. The articulated fly is a simple tie; it is made from a tan Enrico Puglisi Tarantula Hairy Legs Brush (1″ wide) of which the flash was removed:

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I have a theory that the triggerfish we sometimes see cruising the surface or circling each other in mid water may fall for a slow sinking or more neutral buoyant fly like the Tarantula Prawn. I once felt hits on a large, dragging streamer while wading the wave zone of St Francois atoll; I pulled the fly closer to me and to my surprise, a large yellow margin triggerfish carried on biting the fly on the surface right next to me. This made me realise that triggerfish readily snack on things swimming near the surface and they may find a swimming shrimp/prawn irresistible?