This is the salmon nymph my friend wants me to copy - a fly he fished with on the Kola Peninsula. I suppose it's basically a stonefly imitation (which by the way often are called salmonflies in the US :-).
What I find interesting is that he was taught to fish it either upstream or straight across to where I though salmon were holding, and then use an induced take (or Leisenring Lift), and it worked really well. It's a technique they use on the Kola Peninsula when the water is very warm and salmon are lazy!
This one I think, if I know Peter right, has been well chewed by salmon!