Eating raw salmon may contain parasites. There is indeed a certain risk in eating raw salmon, because there may be parasites in the salmon, such as Anisakis. The parasite is typically found in krill, the main food source for salmon. Anisakis does not regard salmon as its final host, but rather fish as an indirect host, with its final development occurring in mammals. In order to reduce the risk of parasite infection when eating raw salmon, the food hygiene standards for raw fish in various countries around the world stipulate how to kill parasites. For example, the United States and the European Union require freezing at minus 20°C for more than 7 days. Therefore, eating raw salmon does not mean that salmon is free of parasites, but that the parasites in the fish are killed through strict freezing.