There was a great article in the New York Times today about our quest for our fish always to be fresh. While I tend to agree, there are environmental effects to keep in mind depending where you live in the country to your choice of wild or farm raised fish or fresh verses frozen fish. What the article fails to mention is that we should, when possible, choose foods that are produced, caught or grown locally and seasonally.
Outside of just fish, the average food on store shelves (fresh, canned or frozen) has typically been shipped hundreds, if not thousands of miles to get to it's final destination. Sure, your diet may lack the variety that you get walking into your average grocery store, but foods taste better when harvested in season. Consider buying in bulk and then freezing, canning or smoking (fish) to enjoy later on in the year.