Survey of External Protozoa Parasite of Siganus Rivulatus in Red Sea State of Sudan

The aim of this study is to survey the external protozoa parasites in Siganus rivulatus in the Red sea state. 51 samples of fish were examined. The fish was selected from two different area in the port sudan, 21 samples collected from Dongnab and 30 samples collected from Alsegala from February to march 2010. This study was conducted in Sudan University of Science and Technology, College of Science and Technology of Animal Production, Department Fishers Science and Wildlife in the laporatory of fishes. The study revealed of different types of protozoa these include Trichodinia, chilodonella, Ichthyophirius and Ichthyobodo recovered in Siganus rivulatus.The protozoa parasites had high prevalence in Alsegala (90% in skin, 56.6% in gill) than Dongnab (57.1% in gill and skin), and the density of protozoa parasites (1.5 in Alsegala and 1 in Dongnab) it is high in skin than gill. Trichodinia recorded highest infection in Siganus rivulatus in this study more than other ectoprotozoa. There is no any relationship between number of parasites and health state of fish.