Al-kahal fish (Oblada melanura) is considered one of the marine species of significan economic and nutritional importance, particularly in the mediterranean region, where it represents an important source of essential nutrients for human health. However, it is susceptible to infection by various external crustacean parasites such as Ceratothoa capri That may negatively affect its quality and nutritional value. In the current study, the presence of C. capri on O. melanura fish along the Tripoli coast was recorded for the first time. 60 fish samples were collected and investigated orally for the presence of C. capri on male, female, and immature fish. The obtained results were evaluated depending on statistical analysis and a comparative study with recently published literature. Results show that immature fish samples showed a high prevalence of infection (15.4 %) while male fish samples have a prevalence of (12.1%) with low variance (2.23) and very low standard deviation (1.49). The proportion of fish infected with the parasite was relatively low, therefore, it was difficult to find a clear relationship or trend between the size or weight of the fish and the percentage of infection. Thus, the only influencing factor in current study is the fish type. A comparative study shows that low prevalence rate (0.26% - 2.33%) across wild populations in the countries such as Turkey, Tunisia, and Algeria compared to Libya (average = 10%), due to the warm weather, environmental diversity, and the virginity of the Libyan marine ecosystem. In addition, descriptive Identification, classification, and key features of both the host and parasite were described. ................ Keywords: ............Ceratothoa capri, Oblada melanura, Tripoli coast, Prevalence.