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Easiest and one of the better tasting brines I have ever used:4 (3 parts for thick filets) parts kosher salt to 1 part brown sugar, cover your fillets completely with this mixture and throw it in the fridge overnight or a full 24 hrs. Pull fillets out of the goo that is formed and wash all of the brine off under cold water. Let the fillets lay out on a cookie rack for 1-2 hrs until fillet is "tacky" to the touch and throw them into the smoker.
We always do a dry brine. Similar to what has been mentioned. We usually let sit in brine for at least 24 hours. Than as stated. Let sit out until tacky than smoke for 6-7 hours in my homemade smoker. Temps rarely reach 100 degrees. Than finish in oven at 325 with a honey glaze.One thing we do is freeze the fish first. I can't prove it, but years ago an ol timer told me to do this because it opens up the pores in the meat. This helps with absorbing the brine. So we never smoke fresh fish without freezing first. Like I said. Can't prove it, but no one will turn down our fish. So it must be working.