The Perpetrator has become one of the most productive swung flies for steelhead on our local rivers. It's a unique design from many other traditional steelhead patterns out there. The beadhead allows it to fish deeper in the water column and the stinging hook allows for a higher hookup ratio.
In rivers where fish really key on insect life, like the Rogue, Klamath, and Trinity, this fly is a must have. It would also be appropriate on Upper Columbia River tributaries like the Grand Ronde. We even fish it in the winter time on the Rogue when we are faced with exceptionally low and clear conditions.