HACCP by Food Type

HACCP for Seafood & Shellfish: Specific Hazards & Controls

Seafood & Shellfish HACCP: Hazards, Allergens & Temperature Controls

Seafood and shellfish present a unique combination of biological, chemical, and allergenic hazards that require specific HACCP controls beyond those used for meat and poultry. Fish carries parasites (Anisakis), certain species accumulate histamine (scombroid poisoning), bivalve molluscs concentrate Vibrio and norovirus from contaminated waters, and crustaceans are one of the UK 14 allergens. The supply chain is often longer and more complex than for other proteins, with temperature abuse during transit a persistent risk. UK businesses must also comply with specific traceability requirements for fishery products under retained EU Regulation 1379/2013. Your HACCP plan for seafood needs to address these hazards from the point of sourcing through to service.

Key takeaways

Seafood carries unique hazards including Anisakis parasites, histamine formation, and Vibrio - your HACCP plan must address each specifically

Deliver fresh fish at 5C or below (ideally 0-2C on ice) and frozen fish at -18C or below

Pre-freeze raw fish to -20C for 24 hours before serving as sushi, sashimi, or ceviche

Fish, crustaceans, and molluscs are three separate UK allergens - manage and declare each independently

Biological and Chemical Hazards Specific to Seafood

The hazard profile for seafood differs significantly from land-based proteins. Anisakis simplex is a parasitic roundworm found in wild-caught marine fish including cod, mackerel, herring, and salmon. Larvae can cause severe allergic reactions or infection if consumed live. Freezing to -20C for at least 24 hours kills Anisakis - this is why raw fish dishes (sushi, ceviche, tartare) require pre-freezing unless the fish has been farmed under controlled conditions that eliminate parasite risk. Histamine (scombroid) poisoning is a chemical hazard caused by bacterial conversion of histidine to histamine in certain fish species (tuna, mackerel, sardines, anchovies, mahi-mahi) when temperature control breaks down. Histamine is heat-stable and is not destroyed by cooking. The only control is maintaining the cold chain from catch to plate. Vibrio parahaemolyticus and Vibrio vulnificus are associated with shellfish harvested from warm waters and are an increasing concern in the UK as sea temperatures rise. Bivalves (oysters, mussels, clams) also concentrate norovirus from contaminated growing waters.

Sourcing, Traceability, and Delivery Controls

Your HACCP plan should identify approved suppliers as a prerequisite programme for seafood. Only source bivalve molluscs from approved harvesting areas classified by the FSA (Class A areas for direct sale, Class B requires purification). Every delivery of fish should arrive at 5C or below (not 8C - seafood degrades faster than meat). Fresh fish on ice should be at or near 0C. Frozen fish must arrive at -18C or below. Reject any delivery showing signs of temperature abuse: strong ammonia smell, soft or slimy flesh, sunken or cloudy eyes, or ice crystal damage indicating refreezing. Check traceability documentation on every delivery: species, catch area (FAO zone), catch method, supplier details, and date of catch or harvest. For bivalves, check the purification or dispatch centre registration number. This documentation is a legal requirement and EHOs routinely check it. Store fish in a dedicated area or fridge, separate from meat and poultry, at 0-4C for fresh or -18C for frozen.

Cooking, Serving, and Allergen Controls

Fish generally requires a lower core cooking temperature than meat. A core temperature of 63C is sufficient for most fin fish species, at which point the flesh flakes easily and becomes opaque. Shellfish (prawns, crab, lobster, mussels) should reach 75C. Bivalves served in the shell should be cooked until the shells open - discard any that remain closed. For raw fish dishes (sushi, sashimi, ceviche), the critical control is the pre-freeze step: ensure the fish has been frozen to -20C for at least 24 hours, or -35C for 15 hours, to kill Anisakis parasites. Document this in your HACCP plan and verify with supplier certificates or your own freezer logs. Allergen management for seafood is essential. Fish and crustaceans are two separate allergens among the UK 14. Molluscs are a third. You must be able to identify which of these three categories each menu item contains, communicate this to customers, and prevent cross-contact during preparation and service. Cross-contact risks are highest when using shared fryers, grills, or preparation surfaces.

HACCP by Food Type

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What to do next

Verify your seafood supplier approvals

Confirm all seafood suppliers are approved and that bivalve molluscs come from FSA-classified harvesting areas. Keep copies of approval certificates and check traceability documents on every delivery.

Set up a dedicated raw fish temperature log

Record delivery temperatures and storage temperatures separately for seafood, with a 5C critical limit rather than the 8C used for other chilled foods.

Document your parasite control for raw fish dishes

If you serve sushi, ceviche, or tartare, document whether parasite control is achieved through pre-freezing at -20C for 24 hours or verified farmed-fish sourcing. Keep supplier certificates or freezer logs as evidence.

Common mistakes to avoid

Mistake

Applying the 8C storage limit to fresh fish

Instead

Fresh fish degrades faster than meat and should be stored at 0-4C, not just below 8C. Histamine-forming species (tuna, mackerel) are especially sensitive to temperature abuse.

Mistake

Treating fish, crustaceans, and molluscs as a single allergen category

Instead

UK allergen law identifies them as three separate allergens. A customer allergic to crustaceans may safely eat fin fish. Declare each correctly and prevent cross-contact.

Frequently asked questions

Do I need to freeze fish before serving it raw?

Yes, unless it has been farmed under conditions that eliminate parasite risk. Wild-caught fish must be frozen to -20C for at least 24 hours, or -35C for 15 hours, before serving raw. Document this control in your HACCP plan.

What is histamine (scombroid) poisoning?

Histamine forms when bacteria convert the amino acid histidine in certain fish (tuna, mackerel, sardines) after temperature control fails. Histamine is not destroyed by cooking, so the only control is maintaining the cold chain from catch to service.

What temperature should cooked shellfish reach?

Shellfish should reach a core temperature of 75C. Bivalves (mussels, clams) cooked in the shell should be cooked until shells open. Discard any that remain closed after cooking.

HACCP by Food Type