Where cod hides

By Symon, Every Label · June 30, 2026

Cod hides far beyond the fish counter. It turns up under foreign names that do not read as “cod” at all, inside products that say “crab” on the front, and in supplements and drinks you would never scan for fish. The good news is that fish is a major allergen in the US, the EU, and the UK, and US labels go one step further: they name the species, so a cod-containing packaged food has to say “cod,” not just “fish.” The catch is everything that sits outside that rule: the salt-cod words in another language, the imitation seafood that is really a cod relative, the fining agent in a glass of beer, and the simple fact that other fish can matter too. This page is the cod label-reading guide. Read it once, slowly, and the words start jumping out at you on their own.

Where a fact below is clinical, it carries its source. None of it is a substitute for your allergist. This is the deep version of the hidden-sources summary that will live on the main cod page; that page is the overview, this is the full scan.

Scan this first

If you read nothing else, read this box. These are the words that mean cod, the one trap that catches everyone, and the places it hides that are easy to miss.

The words that mean cod on a label or menu: cod, codfish, scrod, Gadus (the scientific name), and the salt-cod words in other languages, bacalao, bacalhau, baccala, klippfish, and stockfish. Every one of those is cod (bsaci 2015).

The one trap: salt cod travels under a foreign name. If you are scanning a deli case, a tapas menu, or a Portuguese or Italian dish for “cod” and you do not also know bacalao, bacalhau, baccala, klippfish, and stockfish, you will walk right past it. Salt cod is dried and salted, but it is still cod, and the allergy does not wash out with the salt.

Two more easy-to-miss hiding places: “imitation crab” and surimi are usually Alaska pollock, a close cod relative, so a “seafood salad” or a California roll can be fish even when it says crab. And cod, like other fish, can travel by cooking steam: a sensitized person can react near a fish counter or a kitchen where fish is being cooked, because the fish protein is heat-stable and carried in the steam (kuehn 2014).

When a term is unclear and the label or the server will not tell you, that is a reason to ask, not a reason to assume it is safe.

Where cod hides, by category

Cod turns up in more than fillets, and a lot of it does not read as “cod.” Here is where to look.

Processed and packaged foods under non-obvious names. Battered and breaded fish (fish sticks, fish fingers, “battered fish,” fish-and-chips) is often cod or pollock. Surimi and imitation crab or “seafood” sticks are usually Alaska pollock, a close cod relative, crab-flavored but fish-based. Salt cod appears under its foreign names (bacalao, bacalhau, baccala, klippfish, stockfish) and inside dishes built on it, such as brandade. Fish stock and fish fumet, fish sauce, and “seafood flavoring” all carry fish protein. The tell is in the lexicon below: if you see cod, scrod, Gadus, any of the salt-cod words, surimi, pollock, fish stock, or fish sauce, that is fish to treat as cod for scanning (bsaci 2015).

Supplements and “wellness” products. Cod liver oil is the obvious one, and fish-oil omega-3 supplements and marine collagen peptide supplements are fish-derived too. These are easy to forget because they sit in the vitamin aisle, not the seafood aisle (bsaci 2015).

Isinglass: a fish fining agent in some beer and wine. Isinglass is collagen made from fish bladders, and it is used to clarify (fine) some beers and some wines. It is a genuine, if unusual, food-and-drink exposure: the fish-derived agent is part of how some of these drinks are made. Whether a particular beer or wine used it is not something a standard label will spell out, so it is a question to ask the producer rather than something to assume either way (bsaci 2015).

Cuisines and restaurant dishes. Cod is the backbone of more dishes than the name suggests: fish-and-chips and battered fish (often cod or pollock), salt-cod dishes across Portuguese, Spanish, Italian, and Caribbean cooking (bacalhau, bacalao, baccala, brandade), fish stews and chowders, surimi in sushi and “seafood” salads, and the anchovy that hides in Worcestershire sauce, Caesar dressing, and fish sauce. A chef card that names cod and its hidden forms (salt cod / bacalao, surimi, fish stock, fish sauce) plainly does more than a spoken order across a loud kitchen.

Non-food: supplements and medications (kept in proportion). Fish gelatin, made from fish, turns up in some capsule shells, gummy supplements, and marshmallows, so a “gummy vitamin” or a capsule can be a fish-derived product worth a question to your pharmacist. The move here is the same one you use for any unclear ingredient: flag it and ask, rather than either ignoring it or stopping a needed medicine on your own (kuehn 2014).

Cross-contact and shared equipment. Shared fryer oil (the fish-and-chips fryer, the calamari fryer), shared grills and surfaces at a fishmonger or sushi counter, and the cooking steam itself are frequent incidental fish sources even when the item you ordered is not cod. This is the route the ingredient list cannot warn you about.

Other fish can matter too. Because the label names the species, scanning for “cod” alone does not settle whether other fish are a problem for you. Many people allergic to cod react to other white-flesh fish, and whether that is true for you, and which fish, is a cross-reactivity question, not a label-reading one. It has its own page (see Related pages); for scanning, the rule is simply that other fish, and cod relatives like pollock in surimi, are fish protein to notice, not to wave through.

The label lexicon

This is the core of the page. These are the exact terms on an ingredient list or a menu that mean fish protein is present and should be treated as cod for scanning. Learn the shape of them once.

Always treat as cod or fish (avoid):

• cod, codfish, scrod, Gadus, Gadus morhua, Atlantic cod
• bacalao, bacalhau, baccala (salt cod / dried cod in Spanish, Portuguese, Italian)
• klippfish, stockfish (dried and salted cod / dried cod)
• brandade (a salt-cod dish)
• surimi, imitation crab, “seafood” sticks (usually pollock, a cod relative)
• pollock, Alaska pollock (a close cod relative; in fish sticks and surimi)
• fish stock, fish fumet, fish sauce (nam pla, nuoc mam), “seafood flavoring”
• cod liver oil, fish oil / omega-3 fish-oil supplement, marine collagen peptides

(bsaci 2015 for the fish-protein ingredient and salt-cod names.)

Slow-down terms (check, do not assume):

• “fish” and “seafood” with no species named: on a US packaged food the species should be named, so an unnamed “fish” on a label or a menu is a reason to ask which fish (falcpa)
• “imitation crab” / “crab-flavored”: reads as crab, but is usually pollock, a cod relative; check
• isinglass in beer or wine: a fish-derived fining agent in some products; whether a given drink used it is a question for the producer
• fish gelatin in capsules, gummies, and marshmallows: a fish-derived ingredient; check and ask the pharmacist for medicines
• Worcestershire sauce, Caesar dressing: usually contain anchovy

Usually a false alarm (worth knowing so you do not over-restrict):

• Nothing is listed here for cod. There is no cleared “this is safe” correction for the cod label surface, so this row stays empty on purpose rather than reaching for a reassurance. Whether a parvalbumin-poor fish (such as tuna) is safe for you is an introduction question for your allergist, not a label-reading one (see Related pages).

The labeling-law reality

This is the highest-value insight on the page, and it has a twist most people miss. The problem with cod is not usually the ingredient list. It is the names around it, and the fish that is not cod.

Fish must be declared, and US labels name the species. In the US, fish is one of the major food allergens under the Food Allergen Labeling and Consumer Protection Act (FALCPA), and the rule goes a step further than for most allergens: the specific species has to be named, so a cod-containing packaged food declares “cod,” not merely “fish” (falcpa). The EU and the UK require fish declaration too, under their allergen rules (eu 1169). So for a packaged, labeled food, the species name on the label is reliable: if cod is a deliberate ingredient, the law says it has to be there for you to find, by name.

The twist: declared by species means other fish are your own scan. Because the label names the species, it tells you about cod, not about every fish. Many people allergic to cod react to other white-flesh fish, and “no cod” on a label does not mean “no fish you react to.” Which other fish matter for you is a cross-reactivity question with its own page (see Related pages); for label-reading, the takeaway is that the species name is precise, and precision cuts both ways.

The gap is everything the rule does not cover. Beyond the cross-species point, three places the must-declare rule does not protect you:

• Foreign names and unpackaged food. A deli case, a tapas bar, a restaurant kitchen, and a fish counter are not covered by packaged-food labeling the same way. There is no ingredient list to read, so the salt-cod names (bacalao, bacalhau, baccala, klippfish, stockfish) and the surimi-is-pollock point are on you, and the question goes to a person. A chef card beats a spoken order.
• Processing aids and supplements that read as “not food.” Isinglass in beer and wine is a processing aid, not a headline ingredient, and cod liver oil, fish-oil capsules, marine collagen, and fish-gelatin gummies sit in aisles you do not scan for fish. The species-declaration rule is built around the obvious ingredient, not these.
• Voluntary, unregulated wording. “May contain fish” and “made in a facility that processes fish” are voluntary precautionary statements. They are not regulated and not a reliable measure of how much risk is actually present (falcpa, fda). How strictly you treat them is a personal call along a spectrum, weighing a real but variable cross-contact risk against ruling out a large part of the grocery store. This page will not pick that threshold for you.

What is not a hidden source

Over-restricting has a cost too: it shrinks an already-small safe list and wears a family down. So it is worth saying plainly what does not need avoiding, but only where that is genuinely cleared.

For cod, there is nothing cleared to put here yet. That is deliberate, not an oversight. The big reassurance families reach for, that a cod allergy does not mean every fish is unsafe and a parvalbumin-poor fish like tuna may be tolerated, is real and important, but it is an introduction-risk question that belongs with your allergist and on the cross-reactivity page, not on a label-reading page. The same goes for “isinglass is only a trace” and “most people tolerate purified fish gelatin”: those may turn out to be true for you, but they are not the kind of all-clear a label-reading page should hand out. This page holds the line on avoidance and sends those questions where they belong.

How to act on this

The skill is a routine, and it gets fast.

1. Learn the salt-cod words, not just “cod.” Bacalao, bacalhau, baccala, klippfish, and stockfish all mean cod. On a menu or in a deli case, those are the words that hide it.
2. Treat “imitation crab” and surimi as fish. They are usually pollock, a cod relative. “Seafood” salad and California rolls count.
3. Scan the ingredient list, every time, every purchase. Formulations change without notice. Look for the lexicon words above, and for an unnamed “fish” or “seafood,” ask which species.
4. Remember the supplement aisle. Cod liver oil, fish-oil omega-3s, marine collagen, and fish-gelatin gummies are fish. Ask your pharmacist about fish gelatin in capsules and never stop a prescribed medicine on your own over it.
5. Ask about isinglass for beer and wine if that matters to you; whether a given drink used a fish fining agent is a question for the producer.
6. Use a chef card for unpackaged food, naming cod and its hidden forms (salt cod / bacalao, surimi, fish stock, fish sauce). Ask specifically about shared fryers and grills, and about cooking steam if you are sensitive to it.
7. Take the “other fish” question to your allergist. A “no cod” label does not settle whether other fish are safe for you; that is the cross-reactivity page and an allergist conversation.

Related pages on this site

• Cod allergy: the main profile (the hub this page expands on)
• Finned-fish cross-reactivity: if you react to cod, which other fish matter? (owns the cod-to-other-fish rates and the fish-is-not-shellfish point)
• Fish parvalbumin and the white-versus-dark-flesh question: is a parvalbumin-poor fish like tuna safer? (owns the mechanism and the tolerance nuance)
• Cod recalls

These companion pages are being written and will be linked here as each one goes live.

Frequently asked questions

What words on a label or menu mean cod?

Cod, codfish, scrod, and Gadus all mean cod, and so do the salt-cod words in other languages: bacalao (Spanish), bacalhau (Portuguese), baccala (Italian), and klippfish or stockfish (Northern Europe). Brandade is a salt-cod dish. Surimi and “imitation crab” are usually Alaska pollock, a close cod relative, so they count as fish to scan for too (bsaci 2015).

Is salt cod (bacalao) safe because it is dried and salted?

No. Salt cod is salted and dried, but it is still cod. Cod’s main allergen, parvalbumin, is heat-stable and survives salting, drying, canning, and cooking, so salt cod, dried cod, and canned cod all still carry it (kuehn 2014). Learn the foreign names, because menus and deli cases often use them instead of the English word.

Is imitation crab fish?

Usually, yes. Imitation crab and surimi are typically made from Alaska pollock, a close relative of cod, and flavored to taste like crab. So a “seafood” salad, a California roll, or a “crab” stick can be fish even though it says crab.

Can cod be in beer, wine, or a supplement?

It can. Isinglass, a fining agent made from fish, is used to clarify some beers and wines, so a fish-derived agent can be part of how the drink is made; whether a given product used it is a question for the producer. Cod liver oil, fish-oil omega-3 supplements, marine collagen, and fish-gelatin gummies and capsules are all fish-derived too (bsaci 2015). For a medicine that contains fish gelatin, ask your pharmacist rather than stopping it on your own.

If a label does not say cod, does that mean no fish I react to?

Not necessarily. US labels name the fish species, so “no cod” means no cod, but many people allergic to cod react to other white-flesh fish as well. Which other fish matter for you is a cross-reactivity question for your allergist and has its own page (see Related pages); a “no cod” label does not settle it.

References and medical review

This page is pending independent medical review; the note at the top of the page applies until a reviewer is assigned. The references below resolve every in-body citation. The cod hidden-source surface has no cleared cross-reactivity floor entry, so the hidden-source facts here are sourced to the fish-allergy literature and the cross-species question is routed to the cross-reactivity pages rather than asserted here. Where a reference has no resolvable stable identifier, it is listed bibliographically without a link rather than with an unverified URL.

1. Kuehn A, Swoboda I, Arumugam K, Hilger C, Hentges F. Fish allergens at a glance: variable allergenicity of parvalbumins, the major fish allergens. Front Immunol. 2014;5:179. https://doi.org/10.3389/fimmu.2014.00179
2. British Society for Allergy and Clinical Immunology (BSACI). Guidance on the diagnosis and management of fish allergy (hidden sources including fish gelatin and isinglass, strict-avoidance framing). 2015.
3. Food Allergen Labeling and Consumer Protection Act of 2004 (FALCPA), Public Law 108-282, Title II (fish a major allergen; the specific fish species must be named). https://www.fda.gov/food/food-allergensgluten-free-guidance-documents-regulatory-information/food-allergen-labeling-and-consumer-protection-act-2004-falcpa
4. US FDA. Food Allergies (major food allergens; fish declared with the specific species named; voluntary precautionary statements). https://www.fda.gov/food/nutrition-food-labeling-and-critical-foods/food-allergies
5. Regulation (EU) No 1169/2011 (Annex II allergens, including fish). https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A32011R1169