What term best describes the visitors traveling in Asia were surprised that people would eat head of fish?

The term 'culture shock' best describes the visitors' surprise at the practice of eating fish heads in Asia. Culture shock refers to the disorientation and confusion experienced by individuals when they encounter unfamiliar cultural practices, values, and norms. In this case, the visitors' expectations of food consumption may have been challenged by the unfamiliar tradition of eating fish heads, leading to a sense of surprise and cultural dissonance.