What are the benefits of including some types of fish and shellfish in one’s pregnancy diet, and why must other types of fish and shellfish be avoided during pregnancy?

Some benefits are that some types of fish and shellfish contain a lot of beneficial omega-3 fatty acids and are high in protein but low in saturated fat. Some types of fish and shellfish you should avoid are shark, swordfish, king mackerel, tilefish,and tuna steak