After watching a program the other day I thought I'd mention one of the problems of eating raw fish in Asia.
Fish all over the world contain parasites. For those of you who fish, take a good look at its insides, and in the meat, you'll often find parasites. I've seen plenty of them in my years of sea fishing, but cooking or freezing kills them, then they just become protein.
As Westerners aren't used to Asian parasites, our immune systems can kick in, and you'll find a good number of folk who eat raw or undercooked area when out there get stomach problems of one sort or another, and at worse, the parasite manage to survive your stomach and breed.
This article covers most of them http://www.suite101.com/content/huma...w-fish-a138279