RESUMEN
A brief description of Orientdiploproctodaeum diacanthi and determining its prevalence in Protonibea diacanthus of Persian Gulf. Random Sampling. Thirty one Protonibea diacanthus. Different sizes of spotted croakers were collected in stations of Hendijan, Bahregan and the mouth of Bahmanshir in Persian Gulf. The fishes were transferred to the laboratory, their digestive tract opened and carefully examined for the various types of eaten food. Mean while, some fluks were detected based on the routine staining procedures. The flukes were counted in each fish and some of them sectioned. The collected flukes were diagnosed as Orientodiploproctodaeum diacanthi. 7 out of 31 Protonibea diacanthus were deceted as O.diacanthias. This is the first report of the presence of O. diacanthi in P.diacanthus of Persian Gulf. Infection of such fishes in the Persian Gulf and also some fresh-water fishes by this parasites is possible