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Fish

Fish es la entrada 4 de las catorce sustancias que el anexo II del Reglamento (UE) n.º 1169/2011 hace declarables. IgE-mediated food allergy, mainly to parvalbumin. Dónde se esconde, qué exenciones aplican y con qué reacciona de forma cruzada.

Esto es información de referencia, no un diagnóstico ni un plan de tratamiento. Un calendario de polen no puede decirle a qué es alérgico, y ninguna página puede declarar un alimento seguro para usted — solo la etiqueta del paquete en la mano y el clínico que conoce su historia. Cualquier cosa más allá de síntomas leves y de corta duración en boca o nariz — hinchazón que afecta la respiración o la deglución, urticaria lejos de la boca, sibilancias, vómito o desmayo — es una pregunta de emergencia, no de lectura.

Qué dice la ley

Anexo II, entrada4: “Fish and products thereof”

Esa redacción lleva toda la obligación. La sustancia debe declararse siempre que se use en la elaboración de un alimento y siga presente en el producto acabado, incluso en forma alterada, y debe destacarse en la lista de ingredientes por tipografía — negrita, mayúsculas, cursiva, subrayado o un color contrastado. No hay requisito legal de un recuadro de alérgenos aparte, así que la lista de ingredientes es donde mirar.

Source: Reglamento (UE) n.º 1169/2011, anexo II y artículo 21 · checked 2026-09-06

Qué es realmente la reacción

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.

Qué se lee mal

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.

Fuentes:Reglamento (UE) n.º 1169/2011, anexo II· Reglamento de ejecución (UE) n.º 828/2014 de la Comisión (declaraciones de gluten)· Nomenclatura de alérgenos WHO/IUIS· ventanas de temporada de los programas nacionales de vigilancia aerobiológica de Estonia, Finlandia, Suecia, Dinamarca y Noruega· patrones de reacción cruzada parafraseados de la literatura alérgica y material de EAACI· comprobado2026-09-06

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