Professional career based salmon fishing advice on how to make sure you catch many more salmon than most salmon fishers achieve.
In Scottish salmon fishing instruction the main focus tends to be only about casting a fly rod via the traditional Spey cast and how elegant and how much distance can be achieved. This of course doesn't matter to a salmon as what goes on above the waterline is of zero significance for a successful outcome to the fishing day as long as you can 'reasonably' fully extend the line you're working with. Most salmon are hooked at a range of 15 to 25 yards which is the range area where your fly is under full swim control. With this in mind a distance cast is 35+ yards is less important for fly control reasons than most fishers would understand as a long range salmon fly is uncontrollable by the vast majority of salmon fishers therefor it's not effectively fishing.
One if of the main things that really matters for making sure you have the best chance of catching salmon is having good fly swing spacings between each cast (and remember that even a bad cast will be straightened out quickly by the current). How your boots are perforning on the gravel, rocks or sand are of far more significance when it comes to catching salmon than a nicely presented aerial distance Spey cast. The spacing measure I've personally found to be a winning formula is 3ft between each swing of the fly so that is the exact distance I'll move between each fly delivery which also ensures huge water coverage over the full course of the salmon fishing day. This 3ft distance is usually not too far away from the end of your fly rod's cork handle to the rod's first butt ring. Therefore if you want real precision movement between each cast pick a riverbed stone (or feature) directly underneath your rod's butt ring (when the fly fishes out and the rod is pointing downstream at the end of the cast) and move to it between each cast.
The second most important factor is adopting a sub-surface thought process as focussing and knowing how your salmon fly is performing in the stream (regarding its depth & speed) is of major significance for success in this business. In cold water you really want a slower fished fly and in warm water a faster fished fly often works best. Depth of fly really depends on water temperature and I personally go deeper with my fly swim presentation when the river is warmer and salmon are much more likely to be holding deep. To learn these skills and many more book a Scottish salmon guide and give yourself a new set of salmon fishing skills and a better chance of succes in this amazing pursuit.