I get my fish sent to me in the US and bring them back. tony1928 is right and only "restricted fish" is an issue. However..... in 2011 fish importation falls under food and drug department(???) and this may change.
If it moves to food and drug that's going to be interesting.
Would that mean you need a Phyto certificate? We see that all the time in loads coming into Versa Colds' new plant. But the paperwork is half the time incorrect, and not caught at the border!
I suspect the only issue with Pt. Roberts is that it's an "oddball" import location, so you're going to get noticed. I'd bring through Blaine and the truck crossing.
Importers also (esp. Hawaii, California, and Oregon) should really give their head a shake when in comes to Vancouver. We're closer and warmer than most of their U. S. shipments! The key there is to FLY the shipment. The airport is the only way to go.
We brought fresh cut steaks up from Seattle and it was cheaper and faster to fly a skid, not to mention they don't have the mentality you may run into at a land crossing. And clean your vehicle out, including under the mats.