Objective: this was a cross sectional study aimed to search for ecto-parasites in mouth of mullet fish obtained from the Sudanese Red Sea Coast. Material and Methods: a number of 1540 mullet fish was included in the study. The body surface and mouth parts of fish were examined for presence of parasites and surrounding tissues were examined for pathological effects. Results: one new species for the region was identified (Cymothoa exigua) and fish hosts were also identified (Valamugil Buchanani, Valamugil Seheli, and Mugil Cephalus). Conclusion: The study is the first to report presence of Cymothoa exigua in the Sudanese Red Sea Coast.