I tie the amohipod on scud hooks as small as size 16, the euphausid I usually tie on something like a Gamakatsu SS15 in a size 8. Starman, you bring up an interesting point. While euphausids do, on occasion, use a crayfish-style backflip, they usually swim with their legs, with their bodies held straight. Like euphausids (and freshwater scuds) they may also swim on their sides or upside down. I'm looking forward to seeing Bruce Ferguson's updated material in the new edition of Fly Fishing for Pacific Salmon because I know he's spent a lot of time intensively studying the invertebrates that salmon eat. I have, in the past, tied this pattern backward and did not find it to be any more effective when tied that way. I use extra-small, black bead-chain for the eyes, this gets it below the surface quickly and gives it a little bit of a jigging action on the retrieve. I usually fish it on a floating line if I can see fish working at the surface and, absent that, will sometimes fish it on an intermediate line as a searching pattern. By the way, this pattern was developed by the late Bob McLaughlin and one of the reasons I like it is its simplicity. The tail, mouth parts and antennae are pearl Krystalflash and the body is pearl Cactus chenille (Estaz, Crystal chenille); pale orange and pale pink work well too. The last step is to trim most of the chenille fibers along the back and sides, leaving those underneath to represent legs.