FWIW, I smoked some rainbow trout today that finally turned out just right salty, downright superb in fact. This posted in case someone wants smoked salmon that does not pickle one's tongue. As I posted earlier, every previous brine method that I've followed turns out WAAAAY too salty, much saltier than old time smoked salmon made by an aunt.
I was trying an experiment to make a wet brine just salty enough to float an egg, and it was getting too salty, so I cut back, diluted it a bit and went with a taste test on the brine, slightly more salty than table ready chicken noodle soup. I added a quarter cup of Worcestershire sauce to 1 1/2 quarts of brine, for three good sized trout about 2-2 1/2 lbs. each. Firm fresh orangey red salmon colored meat. Brined in fridge. Got interrupted and a change of schedule forced on me so after a little over an hour in the brine I popped them on the smoker immediately with alder wood smoke. Sprinkled lemon pepper all over the fillets which were patted dryish, plus black pepper and a faint smidge of Johnny's salmon rub sprinkled on. 200 degrees for 1 3/4 hour and I had to leave so pulled them out. Superb! Light saltiness all through the meat. No sweetness, which my wife and I both prefer. if I want candy I prefer chocolate.
If I want meat, whether fish or pork, I want a savory MEAT taste, not sweet. Our mileage varies and that's OK.
They were not truly smoked but rather cooked/baked in smoke. Whatever. Delicious. I'm going to try a minimal salt brine on salmon.
FWIW, I am experimenting with considerably less salt than any recipe I've seen except one that calls for a mix of soy sauce and water for brine.