Thirty samples of Cyprinus carpio were collected from Al-Nasiriya fish ponds during the period from March until Novmber 2017 . Seventeen fish samples showed fungal infection .In this study eight species were identified and the most common were Aspergillus niger, Saplolegnia sp., Achyla prolifera, Alternaria alternate , Penicillium funigulosum, Rhizopus stolinifer, Aspergillus fumigatus and Aspergillus flavus . Aspergillus Niger and Saplolegnia sp. were the most prevalent fungi infecting all the organs of Cyprinus carpio. Gills and abdomen had higher infection than rest of the organs .Keywords: Contaminnet, Disease, Environment, Fishes, Fungi, Ponds.
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