Freshness checks for live shellfish start before you bring it home. Look for intact shells, a clean briny smell, and signs that the animals are alive. Then keep them cold and give them room to breathe until cooking. These simple steps help you spot shellfish that should be avoided and handle good shellfish safely. Different types behave a little differently, so use the checks below alongside any storage or cooking advice from your fishmonger.
Check shells and movement
For clams, mussels, and oysters sold live in the shell, choose shells that are closed or close when gently tapped. A shell that stays open may indicate the animal is dead. Avoid cracked or badly damaged shells, and do not buy shellfish that feels unusually light or dry. Shellfish can react slowly, so give a slightly open shell a moment before deciding it will not close.
Live lobsters and crabs should show movement, such as leg or claw motion, when handled. Ask the seller to confirm that the shellfish is alive and has been kept properly chilled. Choose a busy counter with shellfish displayed cleanly and kept cold, rather than products sitting in warm conditions or pooled in melted ice.
Use your sense of smell
Fresh shellfish should smell clean and mildly briny, like the sea. It should not have a sour, ammonia-like, or strongly fishy odor. If the smell seems unpleasant, do not taste the shellfish to check it. Ask the seller about its freshness, and choose another batch if you are unsure.
Smell shellfish again when you get home and before preparing it. Discard any that have developed an off odor or whose shells are broken. Smell is only one check, not a guarantee of safety, so also pay attention to shell condition, temperature, and how the shellfish was handled.
Keep it cold and breathable
Take shellfish home promptly and refrigerate it as soon as possible. Keep live shellfish cold, but do not seal it in an airtight container or submerge it in fresh water. Place it in a bowl or tray that can catch drips, cover it loosely with a clean, damp cloth, and follow the seller’s advice for the specific type you bought.
Store raw shellfish away from ready-to-eat foods to prevent drips or contact from spreading germs. Prepare it as soon as practical, and do not leave it at room temperature for extended periods. If you cannot confirm that it stayed cold or you are uncertain how long it has been stored, take the cautious option and discard it.
Inspect and cook carefully
Before cooking, rinse shellfish under clean, cold running water. Scrub mussels and clams, and remove beards from mussels if needed. Discard any shellfish with cracked shells or any live clams, mussels, or oysters that remain open after a gentle tap. Keep raw shellfish and its juices separate from cooked food, and wash hands, utensils, and surfaces after handling.
Cook shellfish thoroughly. Clams, mussels, and oysters cooked in the shell should open during cooking; discard any that stay closed. Opening is a useful cooking check, but it does not make shellfish safe if it was spoiled beforehand. Follow reliable cooking guidance for the type and size of shellfish, and avoid serving raw shellfish to anyone at higher risk from foodborne illness unless they have been advised it is safe.
A clean briny smell, intact shells, signs of life, and steady refrigeration are useful freshness checks. None replaces careful handling or thorough cooking, so discard shellfish that seems questionable at any stage. If you are buying in Leeds, ask Leeds Shellfish Market how to store the specific shellfish you choose and when to prepare it.