Jajroud river is one of the most important aquatic ecosystem in Iran (east of Tehran) and consist of variety of different aquatics, of which is a freshwater crab. The crab sample were collected from 5 stations of Taraghion, Khojeer, Latian, Daroee plants and Mamloo dam. The collected samples were studied from point of reproduction and feeding behaviour; and also, carapace length, carapace width and body weight were measured. The most important objective of this survey was to find out the precise species identification. In this regard, sample were transported to the Natural History Museum in Netherland and ultimately, it was certified that all specimens belong to Potamidae family and species of Potamon persicum.
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