Have you ever tried Black Cod Dave? I think they call it Sable Fish now. That has to be my favorite smoked fish. Its oily and pretty rich, so you you can't eat a lot at one setting. Its good for fish chowder too due to the oiliness.
I learned the hard way that it really soaks up the salt in the brine. 1st time smoking it I used my normal brine and tried a piece when it was done. It was BAD! I thought maybe the dog would eat it. Nope. He'd spent all day guarding the smoker from the cats because he knew he'd get a piece. I tossed him a chunk and he immediately spit it out, gave me a dirty look and turned his back on me. I tried to pet him and he kept turning his back. Called the wife out and he was fine with her. I finally remembered I had some fish jerky in the fridge and he forgave me. Made another batch and we were best friends again.
Its still my favorite smoking story, the dog let me know how badly I'd screwed up and what he thought about me at the time.