I have been smoking fish for over 20 years. I have used all kinds of brines, Never used any cure. I have taking yoshidos and just watered it down and let it brien the fish over night, My wife does not like the sweet taste so I adapted and used Bearcarvers brine
Put 1/2 quart of apple juice in a pot on the stove, bringing to low boil & then down to simmer.
Add to this;
6 ounces of soy sauce
1/2 cup of non-iodized salt
1/2 cup of brown sugar
1/2 tsp of Garlic powder
1/2 tsp of Onion powder
1/2 tsp of Cayenne pepper
1/2 tsp of Dried Bay Leaf Flakes (or 2 or 3 fresh bay leaves)
Stir until salt is dissolved. Then add 1 1/2 quarts of water & ice to cool quickly.
Leave the Salmon pieces submerged in this brine for 6 hours in fridge. I just let it go overnight and have never has any isues. Overnight was too long. 4 hours was not long enough.
After removing from brine, rinse each piece well, pat dry, and lay on paper towels.
Get however many smoker racks you will need. My batches just fit on three racks. Spray each rack with Pam to limit the amount the fish will stick to the racks. Dry the thickest pieces one at a time again with paper towels, and put these pieces on one rack. Dry the thinnest pieces, and put them on a different rack. Dry the rest of the pieces, and put them on a third rack. I put the three racks in my extra fridge overnight (uncovered) to dry & form pellicle.
The next day: (Time to smoke the Salmon)
Put the rack with thinnest pieces on top position of your smoker, medium on next position, and thickest on third position.
NO water in water pan.
Exhaust vent fully opened.
Put meat probe in center of thickest piece of fish.
Set smoker to 100 degrees.
Put hickory chips & a couple chunks of Hickory in smoking pan.
During smoking, when smoke stops, add Apple chips & chunks.
Use Hickory only for first couple hours.
I try for a light to medium smoke with my MES.
A little burst of heavy smoke doesn't seem to hurt.
Don't need any smoke after first 4 hours.
Here is a big batch of coho salmon i did a while back