Canned herring is not harmful to the human body.

Precautions for consumption:

1. Inform people around you before opening the can to prevent accidents.

2. Open the can in a closed environment, and the flavor will be rich.

3. Keep it in the refrigerator before opening to reduce the internal air pressure. If it is opened at room temperature, a large amount of liquid may be sprayed out when opening.

4. It is strictly prohibited to bring this kind of can on the plane. Once the can ruptures due to air pressure problems, it may cause safety hazards.

5. After eating, remember to seal the cans, wrap them tightly in bags, label them before throwing them away, so as not to affect the city appearance and environment.

6. Be sure to cook it before eating. If you put it in the microwave, please take it out of the can and reheat it to avoid bursting.

7. If you have any symptoms of discomfort, please move the patient to a ventilated area and perform artificial respiration. If the symptoms are not relieved, please seek medical treatment immediately.

Extended information:

Swedish canned herring is the smelliest food in the world and is usually available during the short summer in Sweden. When herring spawns from April to June every year, fishermen catch hundreds of tons of herring and prepare raw materials for pickling herring. What makes pickled herring unique is its natural fermentation. In order to ensure that the herring will not rot during the fermentation process, the producers always boil the freshly caught herring in concentrated salt water over a warm fire, then put it into cans and let it ferment naturally.

It is said that this process of pickling herring has been passed down for nearly 300 years. At the beginning, fishermen also came up with the method of naturally fermenting pickled herring to save money, because it would consume less salt. By mid-August, the herring in the can has become thick and juicy, and the gas in the can has expanded due to the fermentation of the herring, making the can bulging. This means that the herring has been marinated and is ready for the market.

Baidu Encyclopedia-Swedish canned herring