Enteromyxum leei is a parasitic protist belonging to the group of myxozoans, specifically affecting fish, particularly those in the family Sparidae. It is known to cause enteromyxosis, a disease that leads to severe gastrointestinal issues in infected fish, often resulting in significant mortality rates. The parasite is transmitted through water and can impact aquaculture, making it a concern for fish farming operations. Understanding and managing this parasite is crucial for maintaining fish health and minimizing economic losses in the aquaculture industry.