The Double Barrel Popper is tied in different sizes for just about any predatory fish that eats off the surface. It pushes a lot of water and creates massive disturbance due to the design of the head.
As a GT fly, the tail is often tied with hackle which adds fantastic movement to the pattern, thus giving you the best of both sound and action. Although not as easy to cast as the NYAP, its still a popular choice for Geets. This particular pattern is tied with a #8/0 hook, but with a smaller hook it will deserve a place in your South American jungle box for Peacocks and Dorado.