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Fish

Fish is entry 4 of the fourteen substances Annex II of Regulation (EU) No 1169/2011 makes declarable. IgE-mediated food allergy, mainly to parvalbumin. Where it hides, which exemptions apply, and what it cross-reacts with.

This is reference information, not a diagnosis and not a treatment plan. A pollen calendar cannot tell you what you are allergic to, and no page can clear a food as safe for you — only the label on the packet in your hand and the clinician who knows your history can do that. Anything beyond mild, short-lived symptoms in the mouth or nose — swelling that affects breathing or swallowing, hives away from the mouth, wheeze, vomiting or faintness — is an emergency question, not a reading question.

What the law says

Annex II, entry 4: “Fish and products thereof”

That wording carries the whole obligation. The substance must be declared whenever it is used in the making of a food and is still present in the finished product, even in an altered form, and it must be picked out inside the ingredient list by typeset — bold, capitals, italics, underlining or a contrasting colour. There is no legal requirement for a separate allergen box, so the ingredient list is where to look.

Source: Regulation (EU) No 1169/2011, Annex II and Article 21 · checked 2026-09-06

What the reaction actually is

The dominant fish allergen is parvalbumin, a small muscle protein that is stable to heat, drying, smoking and salting. That is why none of the traditional preservation methods of this region make a fish safe, and why the steam and aerosol from cooking fish can trigger symptoms in a sensitive person in the next room. Fish allergy is one of the more common causes of severe reactions in Nordic children.

Who gets it, and does it last

Fish allergy usually starts in early childhood and usually persists into adult life. Some people react to one species and tolerate others — parvalbumin content varies, and tuna and swordfish are the species most often tolerated — but that is established by clinical testing, not by trial at the table.

Where it hides

• Worcestershire sauce and Caesar dressing (anchovy)
• Fish sauce in South-East Asian cooking
• Surimi and crab sticks
• Some pizza toppings and tapenade
• Stock and bouillon powders
• Omega-3 supplements

Fish sits at the centre of the food culture here — Baltic herring, sprat, salmon, whitefish, and salted, smoked and marinated preparations everywhere. School and workplace canteens across the region serve fish on a fixed weekday, which makes fish allergy a scheduling problem for a family as well as a dietary one.

Cross-reactions

Cross-reactivity between fish species is high because parvalbumin is so conserved. There is no cross-reactivity with crustaceans or molluscs, which are a completely separate problem. Anisakis, a parasite of marine fish, causes its own allergy that can look like fish allergy but responds differently to freezing and cooking.

The labelling detail

Entry 4 carries two narrow exemptions, both for fish gelatine and isinglass in specific technical uses. A beer or wine fined with isinglass therefore need not declare fish, which is worth knowing rather than worrying about, since the residue is minimal by design.

Exempt from declaration under Annex II:

• Fish gelatine used as a carrier for vitamin or carotenoid preparations
• Fish gelatine or isinglass used as a fining agent in beer and wine

Precautionary wording — “may contain”, “made in a factory that also handles” — is a separate matter: it is voluntary, unstandardised and carries no threshold. How strictly to treat it is a clinical decision, not a reading of the label. The labelling explainer sets out the whole frame, including what happens in restaurants and bakeries where there is no pack at all.

What gets misread

Fish oil supplements and fish allergy are not automatically incompatible, but a supplement is a food product and its label is the thing to read. And avoiding fish because of a shellfish allergy, or the reverse, is common and unnecessary.

Sources: Regulation (EU) No 1169/2011, Annex II · Commission Implementing Regulation (EU) No 828/2014 (gluten claims) · WHO/IUIS Allergen Nomenclature · season windows from the national aerobiology monitoring programmes of Estonia, Finland, Sweden, Denmark and Norway · cross-reaction patterns paraphrased from the allergy literature and EAACI material · checked 2026-09-06

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