Serving raw fish has become mainstream across the UK. From sushi restaurants and poke bars to high-end tasting menus featuring tartare and crudo, consumer demand for raw seafood dishes continues to grow. However, raw fish is classified as a high-risk, ready-to-eat food — meaning there is no cooking kill step to eliminate pathogens before the dish reaches the customer. This places a significant responsibility on food handlers and food business operators to manage biological, chemical, and physical hazards at every stage of preparation.
In this guide, we explain the key food safety hazards associated with raw fish, the legal requirements that apply to UK food businesses, and the practical controls every food handler must understand. Whether you are running a dedicated sushi restaurant or adding a raw fish course to your existing menu, this information is essential for protecting your customers and your business.
What Makes Raw Fish a High-Risk Food?
In food safety, we classify foods as high-risk when they are rich in protein and moisture, support the rapid multiplication of bacteria, and are intended to be consumed without further cooking. Raw fish ticks every one of these boxes. Unlike a grilled salmon fillet — where the internal temperature of 75°C destroys harmful organisms — sashimi, sushi, and ceviche are served exactly as they arrive from the supplier, with only minimal processing such as slicing or marinating.
Because there is no thermal kill step, every control measure you put in place — from supplier selection and cold chain management to personal hygiene and cross-contamination prevention — becomes your only line of defence against foodborne illness. A single lapse at any point in the supply chain can result in a customer becoming seriously ill.
The three principal categories of hazard associated with raw fish are parasites, pathogenic bacteria, and chemical contaminants (such as histamine in certain species). Understanding each of these hazards is the foundation of safe raw fish handling.
Parasites in Raw Fish: The Freezing Requirement
Parasitic nematodes — most notably Anisakis simplex — are naturally present in the flesh and organs of many wild-caught marine fish species including cod, herring, mackerel, and wild salmon. If consumed alive, Anisakis larvae can penetrate the stomach or intestinal wall, causing severe abdominal pain, nausea, vomiting, and allergic reactions. Cases of anisakiasis have been documented in the UK and are becoming more common as raw fish consumption increases.
Under EU retained law — specifically Regulation (EC) No 853/2004, Annex III, Section VIII — fishery products intended to be consumed raw or virtually raw must undergo a freezing treatment to kill any viable parasites. The legal requirement is freezing at -20°C or below for at least 24 hours, or -35°C for at least 15 hours. This freezing step effectively kills Anisakis larvae and other parasitic worms, making the fish safe for raw consumption.
The Food Standards Agency (FSA) reinforces this position in its guidance to local authorities and food businesses. If you are serving raw fish that has not been pre-frozen by your supplier, you must carry out the freezing step yourself and maintain documented records that demonstrate compliance. This documentation is one of the first things an Environmental Health Officer (EHO) will ask to see during an inspection. Our sushi and sashimi food safety course covers the freezing requirement in full detail, including how to set up monitoring logs and what to do if your freezer fails.
It is worth noting that farmed Atlantic salmon is generally considered lower risk for Anisakis because the controlled feed used in aquaculture does not contain live intermediate hosts. However, the FSA still advises a risk-based approach, and many local authorities expect freezing documentation even for farmed salmon served raw.
Bacterial Hazards: Listeria, Salmonella, and Vibrio
While parasites can be eliminated through freezing, pathogenic bacteria present a different challenge. Freezing does not kill bacteria — it merely halts their growth. Once the fish is thawed, bacteria will resume multiplying if the product is held at temperatures within the danger zone (8°C to 63°C). The key bacterial hazards associated with raw fish include:
- Listeria monocytogenes — particularly dangerous because it can grow at refrigeration temperatures (as low as 0°C). Ready-to-eat fish products with a long shelf life are especially vulnerable. Listeria poses a severe risk to pregnant women, the elderly, and immunocompromised individuals.
- Salmonella — while more commonly associated with poultry and eggs, Salmonella can contaminate fish through polluted water, poor handling practices, or cross-contamination during preparation. Symptoms include diarrhoea, fever, and abdominal cramps.
- Vibrio parahaemolyticus — a marine bacterium found naturally in warm coastal waters. It is the leading cause of seafood-associated gastroenteritis worldwide. As UK sea temperatures rise due to climate change, the risk of Vibrio contamination in British waters is increasing.
- Clostridium botulinum — a risk primarily in vacuum-packed or modified-atmosphere-packed fish products. The anaerobic conditions inside sealed packaging can allow this bacterium to produce its deadly toxin if temperature control is inadequate.
The single most effective control against bacterial growth in raw fish is strict temperature management. Every minute that raw fish spends above 8°C accelerates bacterial multiplication, and once pathogens reach dangerous levels, no amount of subsequent chilling will reverse the damage. This is why cross-contamination prevention protocols and cold chain discipline are non-negotiable in any business handling raw fish.
Legal Requirements for Serving Raw Fish in the UK
UK food businesses serving raw fish must comply with several pieces of legislation that collectively form the legal framework for food safety. Understanding these requirements is not optional — ignorance of the law is not a defence, and enforcement officers have the power to close non-compliant businesses immediately.
Regulation (EC) No 852/2004 requires all food business operators to implement and maintain a food safety management system based on HACCP principles. This means you must have a documented system that identifies hazards specific to raw fish, establishes critical control points, sets critical limits, defines monitoring procedures, and specifies corrective actions. A generic food safety management pack will not suffice — your system must be tailored to the specific activities your business carries out.
Regulation (EC) No 853/2004 lays down additional specific hygiene rules for food of animal origin. Annex III, Section VIII addresses fishery products and includes the freezing requirement for parasite control discussed above. It also requires that fishery products be kept at temperatures close to melting ice (0°C to 2°C) during transport and storage.
The Food Safety Act 1990 provides the overarching framework and establishes the due diligence defence. If a customer becomes ill after consuming your raw fish, you must demonstrate that you took all reasonable precautions and exercised all due diligence to avoid the offence. This is where your documented HACCP plan, training records, temperature logs, and supplier certifications become your protection. Kitchen Tonic's HACCP services can help you build a fully compliant system that satisfies enforcement officers and protects your business.
Temperature Control and Cold Chain Management
Temperature control is the single most important factor in raw fish safety. From the moment fish is harvested to the moment it reaches the customer, the cold chain must remain unbroken. Any interruption allows bacteria to multiply and can render the product unsafe.
Delivery checks: Every delivery of raw fish must be checked on arrival using a calibrated probe thermometer. The core temperature should be between 0°C and 2°C for fresh fish, and -18°C or below for frozen products. Reject any delivery that arrives above these temperatures, shows signs of thawing and refreezing (ice crystals in packaging, frost burn on flesh), or has damaged packaging. Record the delivery temperature, supplier, and batch number in your delivery log.
Refrigerator storage: Raw fish for sushi and sashimi preparation should be stored in a dedicated refrigerator operating at between 0°C and 2°C — significantly colder than the general legal maximum of 8°C for chilled food storage. If a dedicated unit is not available, raw fish must be stored on the lowest shelf of the refrigerator, in sealed containers, physically separated from all ready-to-eat items. Temperature logs must be recorded at least twice daily.
Display and service temperatures: If you display raw fish at a sushi counter or in a chilled cabinet, the product must remain below 8°C at all times. Best practice is to keep it below 5°C. Monitor the display unit temperature regularly and limit the time individual portions spend on display. Any fish that has been on display for longer than four hours at temperatures above 8°C must be discarded. For more on building these controls into your food safety system, see our food safety compliance guide.
Personal Hygiene When Handling Raw Fish
Personal hygiene is a critical control measure when handling raw fish. Because the product will not be cooked before consumption, any bacteria transferred from a food handler's hands, clothing, or equipment will be consumed directly by the customer.
- Handwashing: Wash hands thoroughly with antibacterial soap and warm running water for at least 20 seconds before handling raw fish, after handling raw fish, after touching any potentially contaminated surface, and after using the toilet. Dry hands with disposable paper towels — never cloth towels.
- Gloves: Use single-use disposable gloves when preparing sushi and sashimi. Change gloves between tasks, between handling different fish species, and whenever they become torn or contaminated. Gloves are not a substitute for handwashing — always wash hands before putting on a new pair.
- Dedicated chopping boards: Use colour-coded chopping boards to prevent cross-contamination. Blue boards are designated for raw fish in the standard UK colour-coding system. Never use the same board for raw fish and ready-to-eat foods such as cooked rice, vegetables, or garnishes.
- Knives and utensils: Use dedicated knives for raw fish preparation and sanitise them between uses. Japanese sushi knives (yanagiba) should be cleaned and sanitised after every service, and stored separately from general kitchen knives.
- Clothing and protective equipment: Wear clean, dedicated kitchen clothing. Hair must be tied back and covered. Remove jewellery (rings, bracelets, watches) before handling raw fish, as bacteria can harbour in crevices and underneath jewellery.
Frequently Asked Questions
Can you serve raw fish without freezing it first?
Under EU retained law (Regulation (EC) No 853/2004), fishery products intended for raw consumption must be frozen at -20°C for at least 24 hours to kill parasites. The only exception is farmed Atlantic salmon, which some local authorities accept without prior freezing due to the low parasite risk from controlled feed. However, this exemption is not universally applied, and you should always check with your local authority before relying on it. We strongly recommend freezing all fish intended for raw consumption as a precautionary measure.
What temperature must raw fish be stored at?
Fresh raw fish should be stored at between 0°C and 2°C — significantly colder than the general legal maximum of 8°C for chilled foods. Frozen fish must be stored at -18°C or below. During display at a sushi counter, the product must remain below 8°C at all times, with best practice being below 5°C. Temperature logs should be recorded at least twice daily for both refrigerators and freezers.
Do I need a specific qualification to serve raw fish?
There is no single mandatory qualification specifically for serving raw fish. However, food business operators have a legal duty to ensure that all food handlers receive adequate training and supervision commensurate with their work activities. Given the heightened risks associated with raw fish, a Level 2 Food Safety qualification is the minimum standard, and we strongly recommend specialist training that covers the unique hazards of raw fish preparation. Kitchen Tonic's sushi and sashimi food safety course is designed specifically for this purpose and provides the specialist knowledge your team needs.
Ready to ensure your team handles raw fish safely and legally? Our specialist Sushi & Sashimi Food Safety Course covers everything from parasite control and cold chain management to HACCP documentation and EHO inspection readiness. Enrol today and give your business the protection it needs.
Written by Carren Amoli, BSc (Hons), RSPH Registered
