Detection parasites of Indian Mackerel (Rastrelliger kanagurta) in North Sumatera, Indonesia

The purpose of this study was to identify ectoparasites and their prevalence infecting Rastrelliger kanagurta in North Sumatera, Medan. So far, people use fish as a processed product. method used is survey with direct collection at the research site. Samples were taken using random sampling technique. Sampling carried out five places Belawan number samples studied many 30 individuals an average length 25.3 cm weight 193.7 grams. Identification laboratory light microscope Faculty Agriculture, University Sumatra. results found seven types parasites that infect surface muscles, fins gills. respective infected Dactylogyrus sp. 13.33% muscus, Austrobdella 30% fin. While gills Zoothamnium sp much 6.67%, Diphyllobothrium 16.67%, Rhadinorynchus 53.33%, Camallanus 20% Anisakis 3.33%. parasite highest rate, on scales, respectively mackerel.