have tuna or swordfish or many fish because of high levels of mercury you don t want transferred to your fetus. what do you say? yeah, fascinating. so it is true that mercury is bad for your fetus and that s the very good reason to avoided large fish but at the same time, omega 3s are good for your baby s i.q. and those are the same, those are found in the same kinds of fish that have a lot of mercury. you re facing a little bit of a trayoff. what are you in the book you want to have fish which are low in mercury but high in oy mega3s like herring, sardines, oily fish we re not eating a lot of but should have more. alisyn: those are the not fish found at sushi bars. no. alisyn: doctor, do you think you could eat sushi free and clear when you re pregnant? absolutely you can have sushi. there is entire nation called japan that eat sushi frequently. i wouldn t go crazy. i wouldn t have sushi every day for lunch. it is something you do in moderation. you do have to keep in mind