is smoked fish safe to eat?

I am trying to avoid anything that may not be safe while pregnant. Although I have read that it is good to eat fish while pregnant. However, I am getting curious as to what fish are to be eaten or not, especially that I read about fishes with mercury not being safe to be eaten while pregnant. And I'm not really familiar with what types of fishes are those. Now, we usually have smoked fish that can be easily bought in the market here in our place. However, I have read on some articles that it is not ideal to eat smoked fish while pregnant. Should that be true? For anyone who did eat this while pregnant, were there any side effects or something when you did? I like smoked fish specially that it is too tasty. But, of course, I need to think of my baby's welfare when it comes to the foods I take.