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In order to indicate the optimum period of shrimp culture, a number of growth models such as linear, log Reciprocal , von Bertalanffy, Gompertz and logistic growth models were applied. In terms of statistics , economics , and biological careteria, logistic and von Bertalanffy models seems to be the best functions describing shrimp growths . the estimated optimum harvesting time for logistic and von Betalanffy models were129 and 132 days respectively. Inputs and output price fluctuation where the main factors affecting the optimum harvesting time. The estimating optimum harvest time could lead to utilize the resources and increase the profitability of shrimp industry.