Oriental shrimp is an exotic species widely distributed in northern Iran. This study was conducted to determine the population dynamic characteristics of this species based on the specimen caught in Golestan Dam lake from February to September 2016. The sex ratio was unbalanced in favor of females (1:1.88). Total length and weight ranged from 16.06 to 85.01 mm and 0.04 to 6.75 gr, respectively. There were significant differences in relative abundance and mean weight among various months. Mean length and weight for males (mean TL = 42.26 mm and W = 1.12 gr, respectively) were larger than that of females (mean TL = 41.15 mm and W = 0.99 gr, respectively). Growth pattern was positive allometric for both sexes (b_female = 3.16, b_{male =} 3.15). Condition factor varied significantly among months and between sexes as well. Von Bertalanffy growth equation was L_{t =} 87.5(1-e^{-0.85(t+0.14)}) for females and L_{t =} 87.5(1-e^{-0.9(t+0.132)}) for males. Natural mortality was calculated 2.09 for females and 2.17 for males indicating a high mortality rate for both sexes.

Keywords: Growth, Mortality, Golestan dam

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