Anisakis is a genus of parasitic worms that primarily infect marine fish and mammals. These nematodes can cause a condition known as anisakiasis in humans when they consume raw or undercooked seafood containing the larvae. Symptoms may include abdominal pain, nausea, and vomiting. To prevent infection, it is recommended to cook seafood thoroughly or freeze it at specific temperatures for a certain period. This process kills the larvae, making the seafood safe to eat. Awareness of Anisakis is essential for those who enjoy sushi or other raw fish dishes.