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Are Scallops Considered Shellfish in Allergies?

Key Takeaways

Scallops are molluscan shellfish and can trigger allergic reactions in sensitive individuals.
Scallop allergy symptoms may include hives, swelling, stomach pain, breathing difficulties, and anaphylaxis.
In Australia, FSANZ requires scallops to be declared on food labels as allergens.
While crustacean allergies are more common, scallops and other molluscs can still cause severe reactions.
Cross-reactivity may occur between scallops, oysters, clams, mussels, and crustaceans.
First aid for scallop allergy includes antihistamines for mild reactions and adrenaline auto-injectors (EpiPen) for severe cases.
Safe management involves allergy testing, medical advice, and clear communication at workplaces and restaurants.

What Is a Shellfish Allergy?

A shellfish allergy occurs when the immune system mistakenly attacks proteins in shellfish, treating them as harmful. This can cause symptoms ranging from mild skin irritation to life-threatening anaphylaxis. Unlike a food intolerance, which affects the digestive system, an allergy is an immune system response.

Crustaceans vs Molluscs

Shellfish allergies fall into two main groups:

Crustaceans: prawns, crabs, lobsters, yabbies
Molluscs: scallops, clams, oysters, mussels, squid

Scallops belong to the mollusc group. While crustaceans cause most shellfish allergies, molluscs like scallops can still pose risks—especially for people allergic to multiple shellfish types.

Are Scallops Considered Shellfish?

What Are Scallops, Scientifically?

Scallops are bivalve molluscs—marine animals with two hinged shells. They are closely related to clams and oysters and are widely consumed in Australia for their tender meat.

How Australia Classifies Scallops in Food Labelling

Under Food Standards Australia New Zealand (FSANZ), scallops are legally recognised as molluscan shellfish. They must be listed on packaged food labels whenever present as an ingredient.

Can Scallops Cause Shellfish Allergy Symptoms?

How Common Are Scallop Allergies?

Allergies to scallops are less common than prawn or crab allergies but still occur. Research suggests some cases of undiagnosed shellfish allergy may be linked to proteins found in molluscs.

What Proteins in Scallops Cause Reactions?

The main allergen is tropomyosin, a muscle protein present in many shellfish. It is heat-stable, meaning cooking does not destroy it. Even trace amounts can trigger reactions in highly sensitive individuals.

Cross-Reactivity With Other Shellfish

People allergic to prawns or crabs may also react to scallops, although this varies. Cross-reactivity depends on how similar the proteins are and each person’s immune system.

Diagnosing and Managing a Scallop or Shellfish Allergy

Diagnosis Through Allergy Testing

Doctors use:

Skin prick tests
Blood tests (specific IgE testing)

If you suspect a scallop allergy, consult a GP or allergist for confirmation and an action plan.

What To Do if You’re Allergic

Avoid cross-contact in shared kitchens.
Read labels carefully for “scallops” or “shellfish.”
Inform employers and colleagues about your allergy.

Tip: If you work in hospitality or food handling, consider completing a certified Food Safety/Allergen Management course to reduce risks.

First Aid for Scallop and Shellfish Allergy Reactions

Recognising Mild vs Severe Reactions

Mild symptoms: hives, itching, nausea, mild swelling, stomach pain.
Severe symptoms (anaphylaxis): swelling of the face or throat, difficulty breathing, dizziness, low blood pressure.

Using Antihistamines and Adrenaline

Antihistamines: may relieve mild symptoms.
Adrenaline auto-injectors (EpiPen): essential for severe reactions. Always carry one if prescribed.

Can You Eat Scallops With a Shellfish Allergy?

When Scallops Might Be Safe

Some people allergic only to crustaceans may tolerate scallops. However, this must be confirmed through supervised allergy testing. Never self-test.