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This study was carried out to determine the cause of unexpected deaths in Koi fish (Cyprinus carpio) cultivated in a private aquarium farm in Mersin, Turkey between June and July 2021. In the samples taken from the skin and fin tissues of fish, it was determined that the cause of these sudden deaths was the parasite Ichthyophthirius multifiliis (Ciliophora: Ichthyophthiriidae). In addition, the morphological features of the parasite and its symptoms in fish were determined.
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