How do the rules apply when you cross into Canada?
Bajabuzz, regarding what Canada might do regarding your Alaska freezer fish as you pass through...I can give you a practical answer but not a technical one on their rule of law. You're asking a good question.
I have never been challenged on this by the Canadians but I've prepared for it as well as possible. Have all your freezer fish bags marked with the date, where caught, and the contents. If halibut or king salmon, record the fish on your license. Record the catch in your log book. Now, a skeptical Canadian officer might say that all that information could just be made up and that the fish were actually caught in Canada. Since the officer couldn't prove that assertion, they probably wouldn't advance it. I've never known any boats being treated unreasonably by the Canadians in this regard bringing fish home, but a fair point to be sure.