Lernaea cyprinacea L. is a lernaeid copepod known to be a pathogenic parasite in freshwater systems, found on a variety of freshwater fish worldwide. Recently it was recorded from two endemic; Pseudophoxinus burduricus and Oxynoemacheilus anatolicus, and one exotic fish species; Gambusia holbrooki in a Karstik Spring Creek (Duger Spring), Burdur-Turkey. After macro- and microscopic inspection of fish, a high prevalence of L. cyprinacea was recorded on P. burduricus (28.3%) and a low prevalence on O. anatolicus (6%). Histopathological examination of lesions revealed inflammatory response in the epidermis, dermis, and muscles. This is the first record of L. cyprinacea on P. burduricus and 0. anatolicus from Turkey. Its prevalence, mean intensity and seasonality with respect to the observed environmental parameters are also presented.