Black sea bass is a fish with low levels of mercury and hence, a good addition to your pregnancy diet. The FDA considers it to be among the ‘best choices’ of fish for pregnant women. It is rich in selenium, a nutrient essential for making thyroid hormones in the body. It is involved in the regulation of immune and thyroid function. However, there are many variants of sea bass and it is recommended that you consult with a doctor before including any variants of seabass in your pregnancy diet.