What Is an Oyster?
An oyster is a marine bivalve mollusk (class Bivalvia) known for its rough, irregular shell. The flat oyster (Ostrea edulis) is native to European coasts; in Türkiye, oysters are found both wild and farmed.
The flesh is tender, has an intense ocean flavor, and is slightly salty. Oysters are most often eaten raw in their own liquor with lemon, but they can also be cooked.
Oyster Nutrition Facts
100 grams of raw oysters contain about 51 kcal and around 6 g of protein; they are very low in calories. They are among the foods best known for their high zinc content and are also exceptionally high in vitamin B12.
What Are the Benefits of Oysters?
With very high levels of zinc and vitamin B12, oysters are nutrient-dense seafood that can be included as part of a balanced diet.
This is general information. Oysters are a food, not a substitute for medical treatment. Eating raw oysters may pose a risk to people with weakened immune systems, pregnant people, and children; cooked oysters are recommended for these groups.
How to Choose Oysters
A live oyster should have a tightly closed shell or close when touched lightly; do not eat an oyster that remains open.
- The shell should feel heavy and moist; do not choose one that feels empty or light.
- It should smell fresh and briny, not sharp or like ammonia.
- Discard oysters with broken or cracked shells.
How to Store Oysters
Live oysters can be stored in the refrigerator for 1–2 days under a damp cloth, with the side of the shell that closes facing down. Do not keep them in a sealed, airtight bag because oysters need to breathe to stay alive.
How to Use Oysters in the Kitchen
Oysters are most often served raw in their own liquor with fresh lemon; they can also be cooked on the grill, in the oven, or in a casserole.
How to Open and Serve Raw Oysters
Carefully open the oyster at the hinge with a special oyster knife. Preserve the liquor and flesh in the lower shell, and serve it on ice with lemon wedges.
Baked Oysters
Top opened oysters with a butter-and-garlic mixture or grated cheese, then bake them briefly—just a few minutes—to heat them through.
What Recipes Use Oysters?
Raw oysters, baked oysters, and oyster casserole are among the best-known ways to eat them.
Frequently Asked Questions
What are oysters good for?
Oysters are nutrient-dense seafood, with very high levels of zinc and vitamin B12, and can be included as part of a balanced diet.
Can oysters be eaten raw?
Yes, oysters can be eaten raw if they are fresh and from a reliable source. Cooked oysters are recommended for people with weakened immune systems, pregnant people, and children.
How long should oysters be cooked?
Bake them for a few minutes, until the shells are slightly warm and the topping has melted.
Why are oysters so rich in zinc?
Oysters naturally accumulate zinc from seawater, which is why they are among the most concentrated sources of zinc.
Can oysters be frozen?
Do not freeze live oysters; shucked oyster meat can be frozen for a short time.