Charteuse was the colour to have during the 2011 season on the Rio Grande and has become one of the must have Argentinean Sea Trout fly colours.   The Yuk Bug is already an all time favourite Sea Trout Fly and this colour variation should now be considered a key addition to your Sea Trout box.  The body of the fly is wrapped with lead wire to give it extra weght, essential to allow the fly to sink down to where the fish lie in the deep holes, typically on the far side of the stream against a cutbank.