Food For Foreigners in Phuket have cod loin which I've enjoyed on several occasions. Speaking of which, I have a couple to defrost tomorrow for a Bacalhau Com Natas, a Portugese dish of cod and potatoes in cream. Pangasius (or Dory fish) is a no-no. Yes, cheap, but bears no relation to a western and UK in particular, white fish. That said, I have had it under the guise of 'fish and chips' a few times, and if it's dried and seasoned well, and cooked in decent batter, it's OK.