Ash, below is a cut from the following thread
Help with Halibut This method will really produce a nice flakey filet with good smoke flavor.
Just keep an eye on things and do not over cook
I have done a lot of expermenting with smoking halibut and if done as detailed below you should end up with a great dinner treat.
First the brine
Seven to one water to salt mix
Use pickling or kosher salt (no iodine)
Use 1 ¾ cup of water and ¼ cup of salt
Soak filets for 2 hours no more than 4 hours
I typically add
¼ cup soy sauce
2 tbl spoons of onion power
2 tbl spoons of garlic power
¼ cup brown suagr
Rinse well with cold water after soaking and pat dry
Soaking in the brine mix will really plump up the filets and replace water lost from freezing and thawing. Really makes a difference, I now brine frozen halibut for any type of cooking.
Smoke with mild wood such as alder or apple for 2 hours between 200 and 225 degrees
Trick is not to overcook and let the filets dry out otherwise you will end up with a brick.
If by chance the filets end up dry I toss then in a food processer and mix with mayo (as in tuna fish san) make a great treat.
Good luck