Can seafood be eaten after being left out overnight?

Generally speaking, whether seafood can be consumed after being stored overnight mainly depends on the storage method and whether it has spoiled. It may still be edible if properly refrigerated, but should be discarded if left at room temperature or showing signs of spoilage. If in doubt, it is advisable to consult a healthcare professional promptly. The details are as follows:

If the seafood was fresh when purchased or slaughtered, immediately sealed and placed into the refrigerator (0–4°C), it is generally safe to consume after an overnight storage. Low temperatures effectively inhibit bacterial growth, slow down spoilage, and maintain food safety. Simply ensure thorough heating before consumption.

However, if seafood is left at room temperature overnight—especially in hot weather—bacteria can multiply rapidly, greatly increasing the risk of spoilage. Spoiled seafood typically develops a foul odor, slimy texture, and darker coloration. Consuming such seafood may lead to gastrointestinal discomfort such as vomiting and diarrhea, and in severe cases, food poisoning. In these instances, the seafood must be discarded immediately and not consumed under any circumstances.

It is recommended to buy and consume seafood immediately. If storage is necessary, promptly refrigerate and seal it properly. Always carefully check the smell, texture, and color before eating; discard immediately if any abnormalities are detected. Cook thoroughly until fully done—avoid raw or undercooked seafood—to ensure food safety.