⚕️ General information only — not medical advice. If pregnant or unwell, always follow the guidance of your midwife, GP or NHS 111. Full disclaimer

Fish & Seafood

Written by Jordan Morley · Reviewed against NHS, FSA and USDA FoodKeeper guidance · Last updated 28 October 2026

Fish safety from mercury limits to leftover storage. Below: 39 answers, grouped by the question they answer.

Food-by-food guides

Each guide gathers every answer for one food in one place.

📋Fish: every answer📋Salmon: every answer📋Tuna: every answer📋Prawns: every answer📋Sushi: every answer

Pregnancy (14)

🟡Prawns when pregnant?🟢Crab when pregnant?🔴Oysters when pregnant?🟢Cod when pregnant?🟢Haddock when pregnant?🟡Salmon when pregnant?🟡Mackerel when pregnant?🟡Sardines when pregnant?🟡Tuna when pregnant?🔴Swordfish when pregnant?🔴Smoked Salmon when pregnant?🟡Sushi when pregnant?🔴Raw Fish when pregnant?🟢Fish when pregnant?

Breastfeeding (5)

🟢Raw Fish when breastfeeding?🟡Salmon when breastfeeding?🟡Tuna when breastfeeding?🟢Prawns when breastfeeding?🟢Sushi when breastfeeding?

Fridge and cupboard storage (4)

🧊How long does cooked fish last?🧊How long does cooked salmon last?🧊How long does tinned tuna (opened) last?🧊How long do cooked prawns last?

Freezing (3)

🟢Can you freeze cooked fish?🟢Can you freeze cooked salmon?🟢Can you freeze cooked prawns?

Reheating (7)

🟡Can you reheat salmon?🟡Can you reheat fish?🟡Can you reheat cod?🟡Can you reheat battered fish?🟡Can you reheat fish pie?🟡Can you reheat prawns?🟡Can you reheat tuna pasta?

Left out overnight (3)

🔴Fish left out overnight?🔴Salmon left out overnight?🔴Prawns left out overnight?

Use-by and best-before dates (3)

🔴Fish after its use-by date?🔴Salmon after its use-by date?🔴Prawns after its use-by date?

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General information only, not medical advice: see the medical disclaimer. Feeling unwell after eating something? Contact NHS 111 or your GP.