The women who participated in the study had to eat a large variety of fish: swordfish and albacore tuna, smaller fatty fish such as mackerel, sardines, anchovies or salmon, and lean fish such as hake or sole, as well as shellfish and other seafood. On average, the women had consumed about 500 g. Children’s scores improved when the quantity of fish was increased to up to 600 g per week. It also didn’t appear to be any additional benefit when women ate more than 21 oz (about 595 g) of fish per week. At the same time the fish consumption was linked with protection from autism. It’s better to avoid the fish that are highest in mercury like catfish, shark, swordfish and giant mackerel.