Ah sis, that's a good question kasi maraming fish pero may mercury content na mataas! From what I know and what a few of us preggy moms talk about, the ones na dapat iwasan are the big predatory fish like shark, swordfish, at king mackerel kasi mas mataas ang mercury, pero honestly, I'd suggest checking with your OB para sure, baka may updated guidelines na ngayon. Most of us naman, ang strategy is go for the safer fish like tilapia, bangus, at salmon, at limit lang ang intake ng the riskier ones, pero better to ask your doctor para you'll have peace of mind throughout your pregnancy!