Allergen: Molluscs – what belongs to it, hidden sources and labelling
Molluscs is one of the 14 allergens that must be declared under Annex II of Regulation (EU) No 1169/2011 – including for non-prepacked food at a buffet. It covers mussels, clams, scallops, oysters, squid, calamari, octopus. In Catering Cat the allergen has the code N.
What belongs to it?
- Mussels, clams, scallops
- Oysters
- Squid, calamari, octopus
- Snails
- Products thereof
Where is it often hidden?
- Oyster sauce (Asian stir-fries)
- Paella and seafood salad
- Fried calamari
- Fish soups and seafood stocks
- Escargots
Exemptions under Annex II
The regulation lists no exemptions for this allergen.
Tips for catering and buffets
- Oyster sauce is the most common hidden source – it is in many stir-fries and vegetable dishes.
- Molluscs are a separate allergen from crustaceans such as prawns.
- Seafood mixes often contain both crustaceans and molluscs.
How it appears on the buffet card
On the back of the card, the allergen is shown with its full name (“Molluscs”), as a short name (“Molluscs”) or as the code “N” with a legend – depending on the display you choose in Catering Cat.
Frequently asked questions
Does oyster sauce contain an allergen?
Yes. Oyster sauce is made from oysters and therefore contains the allergen molluscs.
Is squid a mollusc?
Yes. Squid, calamari and octopus are molluscs, like mussels and snails.
All 14 allergens
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Start for freeThis page summarises the rules in general terms and is not legal advice. When in doubt, ask your local food authority.