You might want to avoid ordering fish from restaurants on a Monday. Seafood markets are closed on weekends, which means that your Monday fish is not fresh fish. Consumption of fish that is not fresh can lead to food poisoning and an unenjoyable meal. Most restaurants buy their fish from seafood markets, but there are some restaurants, mainly four-star restaurants, that do not purchase their fish from seafood markets. If you are craving fish on a Monday, make sure to go to a restaurant with more than three-stars.