Mollusc Allergen: Mussels, Oysters, Squid & Declaration Requirements

Many operators think of molluscs as mussels and oysters, but the category is much broader. Bivalves include mussels, oysters, clams (including razor clams), scallops, and cockles. Gastropods include land snails (escargot), sea snails, whelks, and periwinkles. Cephalopods include squid (calamari), octopus, and cuttlefish. All of these must be declared under the mollusc allergen category. Squid and calamari are particularly common in UK restaurants as starters and bar snacks, and they are sometimes prepared in shared fryers with other foods. Scallops are a premium starter item. Mussels appear in pasta dishes, stews, and as main courses. Oyster sauce is used in countless stir-fries and Asian dishes. Squid ink is used to colour pasta, risotto, and some bread products. Cuttlefish ink serves a similar culinary purpose. Abalone, though less common in the UK, is used in some Chinese restaurants. Check your menu for all of these species, not just the obvious ones.

Cross-contact controls for molluscs follow similar principles to crustaceans and fish. Store raw molluscs separately from other foods, ideally in sealed containers on the lowest fridge shelf. Use dedicated utensils for handling molluscs and clean surfaces thoroughly between mollusc and non-mollusc preparation. Shared fryers are a risk: calamari cooked in a fryer transfers mollusc protein to the oil. If you serve calamari alongside non-mollusc dishes, use a dedicated fryer or fry non-mollusc items first. For declaration under the Food Information Regulations 2014, molluscs must be declared as an allergen whenever present. Name the specific species where possible (e.g., "squid", "mussels") with "molluscs" emphasised as the allergen category. Ensure your allergen matrix captures every dish containing molluscs, including those where mollusc-derived ingredients are present only through sauces or stocks. Staff training should emphasise the breadth of the mollusc category (many people do not know that squid and snails are molluscs) and the hidden source risk from oyster sauce.