After entering the human body, the larva penetrates the mucous layers of Metoclopramide tract and causes symptoms of anisakiasis. Because humans are accidental hosts, the larva dies in the human body without developing into an adult worm.
Reglan in fish can be seen with the naked eye. Worm larvae look like small (1-5 cm), twisted worms of light color, or are stained with blood.
An example is in the photo below. Anisakid in hake meat. The larvae usually move there after the death of the fish, before that being in the abdominal cavity.
Anisakides affect human health in two ways: through intestinal disorders; through an allergic reaction.