When we went fishing on Kodiak Island we did exactly what Joe B has indicated-had the fish flash frozen and then shipped back. Does cost a lot but worth it. We flew so it was the easiest thing to do. Rather than rely on information here that may be incorrect, I would suggest calling/emailing either Canadian Customs, Canadian Fish & Wildlife Service or the Border Agency. In 2 days you haven't gotten a valid answer-even if they take a day or two to respond you might be ahead of the game plus you'll have the most current and accurate information.