Breast-feeding mothers should avoid eating sharks, mackerel, swordfish and square head fish, because the mercury content of these four kinds of fish may affect the growth and development of fetal brain. In recent years, the United States announced that four kinds of fish (shark, horsehead fish, swordfish and mackerel) are too high in mercury, which is not suitable for pregnant women, planned pregnant women, nursing mothers and children. Tip: expectant mothers should not eat shark's fin either, because about 70% of shark's fin is polluted by mercury, and eating too much may pose a threat to health.

You can eat fish with high fat content, such as herring, mackerel (Atlantic, male, whitefish), rainbow trout (cultured), salmon (wild or cultured), sardines, whitefish, and common freshwater fish in our daily life.