Chatto’s jig fly – olive bait-fish
The set up of the jig hook and extension puts the tow point 15mm back along the fly so that a medium to fast strip will cause the fly to dart off in different directions much like wounded or fleeing fish. The 15mm of 8mm diameter closed cell foam tube above the hook eye give the fly neutral buoyancy so then when you pause the lure it basically suspends at or close to the level it was being retrieved giving predators time to attack.