This research aims to know the prevalence and intensity of ectoparasites on tilapia (Oreochromis niloticus) in the floating net cages of Batanghari river, Mendalo Laut Jambi. The research was conducted in February through March 2020, taking samples from 3 stations in each predetermined floating net. From each station 30 tilapia fish were taken for parasite inspection at Stasiun Karantina Ikan, Pengendalian Mutu dan Keamanan Hasil Perikanan Kelas I Jambi. The results of the observations found 3 types of ectoparasites namely Dactylogyrus sp., Epistylis sp., and Oodinium sp.. The highest ectoparasite prevalence rate was found in the species Epistylis sp. with a value of 37,7% and an intensity value of 24,7 ind/fish. The prevalence of Dactylogyrus sp. found a prevalence value of 26,6% and an intensity value of 1,3 ind/fish. The lowest prevalence value was from Oodinium sp. with a prevalence value of 7.7% and an intensity value of 3,2 ind/fish. The prevalence and intensity values of tilapia ectoparasites based on the location respectively were 56,6% and 23 ind/fish (station I), 50% and 18,6 ind/fish (station II) and 43,3% and 17,6 ind/fish (station III).