Clues to Shellfish Doneness When done just right, cooked shellfish is delightfully moist, slightly chewy and absolutely delicious. Overcooked, it's tough and rubbery. Shucked clams, oysters and mussels will become plump and opaque. Oyster edges will start to curl. Crabs and lobsters will turn bright red.
Scallops turn white or opaque and become firm.
Cooking time depends on the size. Raw shrimp will turn pink and become firm. Cooking time depends on the size. For more great ideas from Betty, visit our friends in the Betty Crocker Kitchens . Please review our Legal Notice and Privacy Policy .