Sushi Pregnancy

Mellise • ~BFP August 2016!~ 👶🏻💙 (used pre-seed.softcups.opks) Pregnant with #2 Due Jan,11,2019
Thought and opinions on eating sushi that contains fish low in Mercury (e.g. Shrimp,Crab,Salmon,catfish) 
I know the fatty acids are great for baby brain development. It's low in fat and considered healthy to most people. I really don't see why it is such a great taboo here in the U.S. when women in Japan eat sushi throughout the entire pregnancy and have perfectly healthy babies.