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The oriental river prawn (Macrobrachium nipponense) is natively distributed in China, Japan, Korea, Vietnam, Myanmar, and Taiwan, while in Iran, Uzbekistan and Iraq it is introduced (New et al., 2010). The same species were reported in the Anzali Lagoon in 2006 (De Grave & Ghane, 2006). It belongs to the phylum of Arthropoda (Order: Decapoda; Family: Palaemonida (De Haan, 1849), and known to be omnivorous (New et al., 2010). Spawning occurs in spring and summer when males appear with a hard shell and females with a soft one mate (Wakefield, 2015). The temperature has an important influence on reproduction. Morphologically, there are differences between males and females. Mature males are larger than females (Bacheler, 2013). M.nipponense was first observed in Anzali Lagoon in 2006, and later on spread in northern Iran's water basins (Coad, 2016). Prawn and shrimp of the genus Macrobrachium and Penaeus are highly appreciated in the whole world. Because of ARTICLE INFO ABSTRACT Article History: Received: Dec. 13, 2020 Accepted: Jan. 21, 2021 Online: April 22

Length-Weight Relationship and Fulton’s Condition Factor of Macrobrachium nipponense (De Haan, 1849) in Siah Darvishan River, Iran