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Fish is usually well stored in the freezer or refrigerator and can be kept until just before eating. However, after a period of time, the meat and fish will be rotten and no longer safe to prepare healthy food. To tell if the fish is no longer fresh, you need to pay attention to the sell-by date printed on the package, where the fish is stored, and the texture and taste of the fish. If you want to avoid food poisoning, it’s best to discard fish that show signs of spoilage.
Steps
See the expiration date
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Discard raw fish stored in the refrigerator 2 days after the sell-by date. Raw fish does not stay fresh for long in the refrigerator and starts to go bad after the sell-by date. Check the expiration date on the product packaging. If the fish is past this time limit by 1 or 2 days, you should immediately discard it. [1] X Research Source
- If you want to extend the shelf life of fish stored in the refrigerator, you need to move the fish to the freezer.
- If the fish has a use-by date instead of a sell-by date, you should not keep the fish longer than that date. “Shelf life” indicates that the fish begins to spoil after this date.
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Store prepared fish in the refrigerator for about 5 or 6 days after the sell-by date. If you buy processed fish or prepare your own fish and store it in an airtight container in the refrigerator, it will last longer than raw fish. However, if you haven’t eaten the fish after 5 or 6 days, you need to discard the fish. [2] X Research Source
- If you know in advance that you won’t eat cooked fish before you run out, you can put the fish in the freezer to extend its shelf life.
- If you want to remove the packaging after preparing the fish and storing the fish in the refrigerator, write down the sell-by date so that you don’t forget it after removing the packaging.
- You can write the sell-by date on a note label to stick on the fish storage box, or write the date in a notebook on the top of the refrigerator.
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Store frozen fish for 6 to 9 months after the sell-by date. Whether raw or processed, frozen fish will last longer than refrigerated fish. The only exception to this rule is for smoked salmon. Even when stored in the freezer, smoked salmon will only keep for about 3 to 6 months. [3] X Research Sources
- You can always freeze salmon yourself, whether you buy it raw or processed. To freeze salmon, you can wrap the pieces in plastic wrap or put them in a sealed plastic bag. [4] X Research Sources
Fish test
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Check the slime layer on raw fish. When the fish is left for a long time and starts to go bad, the surface of the fish will become more wet and gradually have a thin layer of slime. That is a sign that the fish has started to go bad. When the fish is rotten, the slime layer on the fish will be thicker and more slippery. [5] X Research Sources
- Discard raw fish as soon as you see the fish begin to become slimy.
- Processed fish will not have a slimy layer even when it starts to spoil.
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Smell the fishy smell. All raw or processed fish has a fishy odor. However, fish stored in the refrigerator when stale will have a stronger fishy smell. If the fish is left out for longer, the fishy smell will gradually become the smell of rotten meat. [6] X Research Sources
- As the rancidity increases, the fishy smell will become heavier. It’s best to discard the fish as soon as it starts to stink.
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Check to see if the raw fish has turned opaque. Fresh fish is usually pale pink or white with a thin, transparent layer of water. When you keep fresh fish or fish stored in the refrigerator for too long and the fish starts to go bad, the flesh will become opaque. The opaque part of the fish is also blue or gray. [7] X Research Sources
- Processed fish will not be opaque. This is a sign of past expiry date of raw fish.
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Check for signs of freezing. If you have kept fish in the freezer for longer than 9 months, the fish will begin to show signs of freezing. Check for ice crystals forming on the surface of the fish and notice any discolouration. [8] X Research Source Throw away frozen foods.
- Frozen food is still edible and does not cause poisoning. However, the fish will lose its fresh taste and rough texture due to freezing.
Identify expired salmon
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Note the disappearance of the white sugar on the fish. Unlike other fish, salmon is famous for its thin white lines that divide the layers or fibers of the fish. These lines indicate that the fish is still fresh. If the salmon meat no longer has white lines or is gray, it means the fish is spoiled. [9] X Research Source
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Press on the salmon to test for firmness. Fresh salmon is usually firm. If salmon stored in the refrigerator becomes mushy or softer than expected, the fish is no longer edible. [10] X Research Source
- The white lines between the salmon fibers indicate the firmness and freshness of the fish. When the white lines are gone, the fish meat is definitely mushy.
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Check for discolored spots on the salmon flesh. Unlike other fish, salmon will discolor when kept for too long and begin to spoil. Check the surface of the fish. If you see spots other than the bright pink of the salmon, the fish is no longer usable. [11] X Research Source
- Most of the discolouration you see on salmon is usually a dark color. However, spoiled salmon also have small white patches.
Advice
- Canned fish can be kept for several years. Canned tuna, anchovies or sardines can be kept for 2 to 5 years past the sell-by date printed on the box. If canned fish is 5 years past its expiration date, it’s best to throw it away. [12] X Research Source
- If the canned fish has a use-by date rather than a sell-by date, the salmon should be eaten before the use-by date.
- Since salmon spoils faster than other canned fish, canned salmon will only keep for 6 to 9 months. [13] X Research Source
Warning
- When in doubt, you should throw away fish you suspect to be spoiled because it’s not worth the risk of food poisoning.
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This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
This article has been viewed 6,244 times.
Fish is usually well stored in the freezer or refrigerator and can be kept until just before eating. However, after a period of time, the meat and fish will be rotten and no longer safe to prepare healthy food. To tell if the fish is no longer fresh, you need to pay attention to the sell-by date printed on the package, where the fish is stored, and the texture and taste of the fish. If you want to avoid food poisoning, it’s best to discard fish that show signs of spoilage.
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