The Chubby Chernobyl is a big improvement on a Chernobyl Ant, adding a bouyant and highly visible wing to a fly that already catches tons of fish.
This fly is used to imitate a hopper, stonefly and skwalla. It is also fished as an attractor pattern.
This fly is a great choice of fly to use as a hopper dropper, since it can easily float most tungsten bead nymphs.