Fresh clams, mussels, oysters keep about 5–10 days in the fridge at 40°F (4°C) or below, counting from the day you bought them.
That's the longest window published for Fresh clams, mussels, oysters — sealed in the fridge is its best case.
| Situation | Keeps for |
|---|---|
| Unopened · fridge | 5–10 days |
| Freezer | Not recommended |
Air and warmth are what shorten an opened item's life — the right container buys back the days the packaging gives up once the seal's broken.
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About 5–10 days at 40°F (4°C) or below, according to USDA FoodKeeper v128. That window runs from the day you bought it — FoodKeeper publishes no separate after-opening figure for this one.
Yes — keep Fresh clams, mussels, oysters at 40°F (4°C) or below. Refrigerate at 40°F (4°C) or below.
Look for: A strong fishy, sour, or ammonia smell; A slimy film, or dull sunken eyes on whole fish; Flesh that doesn't spring back when pressed; Discoloration or darkening at the edges. Those are the general signs for seafood — USDA FoodKeeper v128 publishes no spoilage note for Fresh clams, mussels, oysters specifically. Never taste something to test it — when in doubt, throw it out.
USDA FoodKeeper v128 does not recommend freezing Fresh clams, mussels, oysters — it survives but the texture or quality suffers badly.