Deciding how much seafood to buy depends upon how you intend to prepare it and the desired size of individual servings. The quantities listed below are good portions for an adult entree. Smaller quantities should be used for appetizers and casseroles where other ingredients are included. Seafood Type: Whole Fish Serving per Person: 1/2 lb. - 1 lb. Seafood Type: Fillets Serving per Person: 5 - 7 ozs. Seafood Type: Steaks Serving per Person: 6 - 8 ozs. Seafood Type: Oysters, Clams Serving per Person: 1/2 dozen Seafood Type: Scallops Serving per Person: 6 - 8 ozs. Source: Virginia Seafood