As much as me and Hopalong do not get along here, I cannot let his trip to Vancouver be a bad one....Also I will be out of town my self for the last week of the summer so he wont be interupted during his fine seafood meal..
http://www.canneryseafood.com/
http://www.clubzone.com/c/Vancouver/Restaurant/A_kettle_of_fish.html
Another suggestion is to take a cab to a little town call steveston,not far from Vancouver and alot of the fishimg boats dock there with plenty of small little places to eat ..
I hope you enjoy your stay in Vancouver.....Other then me,you will find all other Canadians to be friendly and helpful,so just ask anyone who is near and they will point you in the right direction for fine seafood...You should also consider a ferry ride over to victoria...some of the best scenery in the world is that trip across the straight..Best of luck...