Prawns in garlic, a pot of mussels, a seafood paella: shellfish is a menu favourite across Europe, and a common source of confusion for pregnant diners. Is it all off-limits? Not at all. Properly cooked shellfish is generally considered safe in pregnancy, and it can be a useful source of protein, iodine, zinc and iron. The risk lies mainly in raw or undercooked shellfish, and in how it is stored and served. Here is a practical guide, based on advice from the NHS, EFSA and ECDC.
Why shellfish needs extra care
Shellfish such as oysters, mussels and clams are filter feeders: they can concentrate bacteria and viruses from the water they live in. Eaten raw or lightly cooked, they can carry norovirus, hepatitis A, Vibrio and other pathogens. The NHS advises pregnant women to avoid raw shellfish, because food poisoning at this stage can be more serious and harder to manage. Shellfish also appears among the foods where Listeria can be a concern when it is cold-smoked, pre-prepared or kept chilled for a long time.
What to avoid
- Raw oysters and other raw molluscs, including on seafood platters and tasting menus.
- Ceviche, tartare and raw shellfish dishes where lime juice or marinade is the only “cooking” (acid does not reliably kill bacteria or viruses).
- Cold-smoked shellfish and chilled ready-to-eat seafood salads that have been sitting out or kept for days.
- Mussels or clams that stay closed after cooking: they should be discarded, as should any that were open before cooking and do not close when tapped.
What is generally fine
- Prawns, shrimp, langoustines, crab and lobster that are cooked until opaque and piping hot.
- Mussels, clams and cockles steamed or boiled until their shells open fully.
- Cooked shellfish in paella, risotto, pasta, soups and stews, as long as it was heated through and served hot.
- Squid and octopus that are fully cooked (not served raw or marinated only).
The key phrases are “cooked right through” and “served hot”. A prawn cocktail made with cooked prawns kept properly chilled is usually acceptable; the question is how long it has been prepared and how it was stored.
Mercury, iodine and portions
Shellfish is generally low in mercury compared with large predatory fish such as shark, swordfish and marlin, which the NHS advises avoiding in pregnancy. Shellfish also contributes iodine, which is important for the baby’s development. Even so, variety is sensible: guidance also covers oily fish limits (up to two portions of fish a week, one of them oily, in the UK advice), so shellfish is best enjoyed as part of a varied diet rather than every day.
A note on allergens: crustaceans and molluscs are two of the 14 major allergens that EU rules require restaurants to declare. If you have a shellfish allergy, being pregnant does not change that. Always ask about cross-contamination in shared fryers, pans and stock.
Seven questions to ask before you order
- Is the shellfish in this dish fully cooked?
- Are the oysters or clams in the starter served raw, or can I have a cooked option?
- How long has this seafood salad or cocktail been prepared, and how is it stored?
- Is the stock or sauce made with shellfish, and does it contain alcohol (white wine, brandy, pastis)?
- Is the shellfish smoked, and if so, hot or cold smoked?
- Are shellfish cooked in a shared fryer or pan with other dishes?
- Can the dish be served very hot, straight from the kitchen?
Hidden alcohol is worth a thought: flambé, bisque and sauces often include wine or spirits. Cooking reduces but does not always remove alcohol, so it is fine to ask for an alternative.
Warning signs after eating
If you develop vomiting, diarrhoea, fever or flu-like symptoms after a meal out, contact your doctor or midwife promptly, mentioning that you are pregnant. Do not wait for symptoms to pass on their own.
For restaurateurs: serving shellfish with confidence
If you run a restaurant, you can make pregnant guests feel welcome with small, concrete changes: mark clearly on the menu which dishes contain raw shellfish, offer cooked alternatives to raw bars and tasting menus, train staff to answer allergen and alcohol questions, and keep clear records of supplier sourcing and cold-chain temperatures. Our method page explains how SafeBloom training approaches these topics, and the restaurants page explains the certification course. Please note that SafeBloom certification is a training mark (an 8-hour online course with a final exam), not a health inspection or kitchen audit.
The bottom line
Cooked shellfish can have a place on a pregnant diner’s plate. Raw, lightly cooked and cold-smoked shellfish should be left until after the baby arrives. As always, individual circumstances differ, so check with your doctor or midwife if you have specific concerns.
Find a restaurant that welcomes your questions: try the Restaurant Finder (many listings come from OpenStreetMap and have not been verified by SafeBloom) or check a certificate with our verification page. Restaurateurs can discover the SafeBloom certification course.
Sources: NHS, “Foods to avoid in pregnancy” and “Fish and shellfish in pregnancy”; EFSA opinions on iodine and food allergens; ECDC, foodborne disease factsheets.