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Crustecean parasites on marine fishes are found in diverse forms; they infect many species of fishes and cause considerable damage to the host. The commercially and economically important marine fish species Rastrelliger kanagurta were examined for crustecean parasites infection. Cymothoid Isopoda, Norileca indica were collected and identified from the body (branchial chamber) of a Scombrid fish, Rastrelliger kanagurta. Detail morphological features and life stages of N.indica are described with their incidence and prevalence in Rastrelliger kanagurta.