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Swett River Prawn, Macrobrachium esculentum (Thalwitz,1891) is one of the freshwater prawns' species that have important economic value and is the least concern species in the IUCN red list. The purpose of this study was to determine the length-weight relationship and condition factor of M. esculentum in the downstream watershed Rongkong. Prawns’ sampling was conducted from September 2018 to February 2019 from the artisanal fishery in the downstream watershed Rongkong. using method simple of Random Sampling. M. ecsulentum obtained as many as 244 Prawns’ consisting of 147 male and 97 female. The results showed that the long weight relationship for males was W = 0.712L 0.2865 and females W = 11.137 L . b value for males is smaller than 3, growth is allometric negative while females are positive allometric (b>3). Average condition factor values for male and female shrimp are 275.28 and 1.88, respectively. The average relative weight (Wr) values for males and females are 100.2 and 101.9, respectively, which shows that the waters are still

Length weight relationships and condition factor of sweet river prawn, Macrobrachium esculentum (Thalwitss, 1891) in the downstream Rongkong watershed