Now, I can't recall where I found it, but if I do, or you do, please let me know and I'll be sure to give the rightful chef his/her due credit. That being said, the tips I am sharing with you are mine and not part of the directions.
For the marinade:
1/3 cup low sodium soy sauce
1/3 cup brown sugar
1/3 cup water
1/4 cup veg oil
1 1/2 lbs. fresh salmon fillet (I prefer wild caught with skin on)
Mix rub ingredients together in small bowl and set aside.