Handling Fresh Prawns and Crustaceans Safely

Prawns, crabs, lobsters and other crustaceans spoil fast and can carry Vibrio and other bacteria, so treat them as potentially hazardous food. Receive them cold, keep raw and cooked product apart, hold everything at 5°C or below on plenty of ice, cook to 75°C at the core, and cool cooked prawns quickly. Good icing, separation and temperature records are what keep them safe from delivery to service. Key takeaways: Prawns and crustaceans are potentially hazardous food: keep raw and cooked product at 5°C or below, ideally buried in ice, at every stage from delivery to service.. Spoilage is rapid and driven by temperature — the less time seafood spends in the 5-60°C danger zone, the safer and fresher it stays.. Vibrio and other bacteria are controlled by cold holding, thorough cooking to 75°C at the core, and strict separation of raw from cooked and ready-to-eat food.. Crustacea is a declared allergen under the Food Standards Code, so it must be managed to prevent cross-contact and declared under PEAL labelling rules (Standard 1.2.3).. Check and record temperatures on receipt and during storage; reject or use-quickly any delivery that arrives warm, off-smelling or in damaged packaging.. Why prawns and crustaceans are high-risk Crustaceans are among the most perishable foods a kitchen handles. Their flesh is delicate, naturally high in moisture and nutrients, and carries enzymes and bacteria that break it down quickly once the animal dies. As potentially hazardous food under the Australia New Zealand Food Standards Code, prawns, crabs, bugs, lobsters and yabbies support the growth of food-poisoning bacteria and must be kept under temperature control. The specific concern with seafood is Vibrio, a group of bacteria that live naturally in warm coastal and estuarine waters and can be present on raw prawns and shellfish. Vibrio multiplies rapidly at warm temperatures, so a batch left out of refrigeration can become hazardous well before it looks or smells off. Other bacteria such as Listeria and Staphylococcus, plus general spoilage organisms, add to the risk, particularly once product is cooked and handled. Because the margin for error is small, the whole approach to crustaceans is built around speed and cold: move product quickly, keep it below 5°C, and minimise every minute it spends in the 5-60°C danger zone. Receiving and inspecting a delivery Food safety for crustaceans starts at the back door. Cold seafood should arrive at 5°C or below, and you are entitled to check it before you sign for it. Probe a representative package with a clean, sanitised thermometer, or at minimum confirm the load is thoroughly chilled and packed in ice. A delivery that arrives warm, with melted ice or pooling liquid, is a delivery you can question or reject. Use your senses as well as the thermometer. Fresh raw prawns should smell clean and of the sea, not of ammonia or sourness. Shells should be intact and firm, the flesh translucent and springy rather than mushy, and there should be no black discolouration spreading through the meat or heavy blackening at the head (some darkening is natural, but rapid spread signals age). Live crustaceans such as mud crabs or lobsters should be lively and moving, not sluggish or dead on arrival. Probe or verify chilled seafood is at 5°C or below before accepting it.. Reject loads that are warm, have melted ice, damaged packaging or pooling liquid.. Check for a clean sea smell — reject ammonia, sour or 'off' odours.. Confirm live crustaceans are alive and active; dead animals sold as live should be refused.. Record the supplier, date, product and receiving temperature so you have traceability if there is ever a recall.. Icing and cold storage Ice is your most important tool with crustaceans. Whole and shell-on prawns keep best buried in a bed of clean ice in a self-draining container or perforated tray, so melt-water runs away rather than pooling around the flesh. Top up the ice regularly and keep the product below 5°C throughout. Ice both chills quickly and keeps the surface moist, which slows spoilage and drip loss. Store raw crustaceans below and away from cooked and ready-to-eat food in the cool room or fridge, never above it, so nothing drips down. Keep raw and cooked prawns in separate, clearly labelled, covered containers. If you are not going to use fresh product within a day or two, freezing is the safer option — freeze it promptly while it is still at peak quality rather than as a last resort once it is near the end of its life. Hold raw and cooked crustaceans at 5°C or below at all times.. Bed prawns in plenty of clean ice in a self-draining tray; refresh the ice regularly.. Store raw seafood below and separate from cooked and ready-to-eat foods.. Keep containers covered, labelled and dated; practise first-in, first-out rotation.. Freeze surplus fresh product while it is still fresh, not once it is fading.. Preventing cross-contamination Raw crustaceans can carry bacteria that a later cooking step would normally destroy — but only if those bacteria never reach food that will be eaten without further cooking. Cooked prawns for a seafood platter, salads, sandwiches and garnishes are all ready-to-eat, so keeping raw juices and raw-handling equipment away from them is critical. Use separate boards, knives, tongs and containers for raw and cooked seafood, or clean and sanitise thoroughly between tasks. Wash and sanitise hands after handling raw product, and never use the same utensils or gloves to move from raw to cooked without a clean-down in between. Store and transport cooked prawns in dedicated covered containers, well away from anything raw. Crustacea is also one of the declared allergens under Standard 1.2.3, and allergen cross-contact is a serious risk even in tiny amounts. Prepare crustaceans away from allergen-free orders where possible, and make sure the presence of crustacean is communicated to customers — through PEAL (Plain English Allergen Labelling) on packaged food and clearly to staff and diners for food sold unpackaged. Keep separate, colour-coded or clearly designated equipment for raw and cooked seafood.. Clean and sanitise boards, knives, tongs and surfaces between raw and cooked tasks.. Wash hands and change gloves moving from raw to ready-to-eat handling.. Manage crustacea as a declared allergen — prevent cross-contact and declare it (PEAL, Standard 1.2.3).. Never let raw seafood or its liquid touch cooked prawns or ready-to-eat food.. Cooking and cooling cooked prawns Where crustaceans are cooked, cook them thoroughly — to a core temperature of 75°C, which reliably destroys Vibrio and other vegetative bacteria. Prawns turn from translucent grey to opaque pink and the flesh firms up; crabs and lobsters change shell colour and the meat becomes opaque. Verify with a clean probe rather than relying on colour alone, especially for larger or shell-on pieces. Cooked prawns that are not served hot must be cooled quickly, because the cooking step removes competing organisms and any surviving or re-introduced bacteria can grow unchecked in the cooked flesh. Aim to cool through the danger zone fast: the two-stage guide is 60°C down to 21°C within two hours, then 21°C down to 5°C within a further four hours. Ice slurries and shallow layers help cooked prawns cool quickly. Once chilled, hold cooked product at 5°C or below. If you serve prawns hot, hold them at 60°C or above. Reheating previously cooked prawns for hot service should take them rapidly to 75°C, and you should only reheat once. Cook crustaceans to 75°C at the core; confirm with a sanitised probe.. Cool cooked prawns using the two-stage rule: 60°C to 21°C within 2 hours, then to 5°C within 4 more hours.. Hold hot prawns at 60°C or above and cold cooked prawns at 5°C or below.. Reheat cooked prawns rapidly to 75°C and only once.. Use ice slurries and shallow trays to speed cooling.. Using time as a control and thawing safely There will be moments — a seafood display, a buffet, a busy prep bench — when crustaceans sit out of refrigeration. The 2-hour/4-hour rule gives a practical framework: potentially hazardous food held between 5°C and 60°C for under 2 hours can be refrigerated or used; between 2 and 4 hours total it must be used and not returned to the fridge; and beyond 4 hours total it must be discarded. Because seafood spoils faster than most foods, treat these as outer limits, not targets, and keep display prawns nested in ice. Thaw frozen crustaceans safely, never on the bench at room temperature. Thaw in the refrigerator at 5°C or below, in a covered container that catches drips, allowing enough lead time. Once thawed, treat the product as fresh: keep it cold, use it promptly and do not refreeze thawed raw seafood. If your kitchen serves any seafood raw or lightly cured, be aware that freezing under controlled conditions is used to manage parasites in fish destined for raw service — a separate consideration from the bacterial controls above. Apply the 2-hour/4-hour rule as an outer limit for prawns left in the danger zone.. Keep display and buffet crustaceans bedded in ice, and rotate them.. Thaw frozen seafood in the fridge at 5°C or below in a drip-catching container — never on the bench.. Do not refreeze thawed raw seafood; use it promptly.. Freezing under controlled conditions is used to control parasites in fish served raw.. Checklist: Chilled seafood received at 5°C or below and checked before signing. Delivery inspected for clean smell, intact shells, firm flesh and live crustaceans where applicable. Receiving temperature and supplier details recorded for traceability. Raw prawns bedded in clean, self-draining ice and held at 5°C or below. Raw seafood stored below and separate from cooked and ready-to-eat food. Separate or sanitised equipment used for raw versus cooked seafood. Crustacea managed as a declared allergen and declared under PEAL where required. Cooked prawns reach 75°C at the core, verified with a probe. Cooked prawns cooled using the two-stage cooling rule and held at 5°C or below. Frozen seafood thawed in the fridge, never refrozen once thawed. The 2-hour/4-hour rule applied to any product left in the danger zone. Common mistakes: Leaving prawns on the bench or in shallow water instead of buried in draining ice, so they warm into the danger zone.. Accepting a warm delivery or melted-ice load rather than probing and rejecting it.. Storing raw prawns above cooked or ready-to-eat food so raw drip contaminates them.. Using the same board, knife or tongs for raw and cooked seafood without cleaning and sanitising.. Judging doneness by colour alone instead of confirming a 75°C core with a probe.. Cooling large batches of cooked prawns slowly in a deep container rather than in shallow trays or ice slurries.. Thawing frozen crustaceans on the bench at room temperature, or refreezing thawed raw product.. Failing to declare crustacea as an allergen or letting it cross-contact allergen-free orders..