Assessing population crab Portunus pelagicus by collecting data from the Pier 4 in coastal Oman from the Arabian Sea and the Sea of Oman from January 2011 to May 2012 to assess the age and growth of information. The frequency distribution of the crab carapace width of 1,000 samples for analysis by the method of Bhattacharya age composition of the study. The maximum age of the crab P. pelagicus is 15 months and the growth parameters of the Bertalanffy (1938) found no significant difference between male and female crabs by the k of crab, crab, males, females and all are equal. 1.85, 1.68 and 1.68 years, respectively CL∞ were 102.83, 109.57 and 108.46 mm. mortality coefficient (Z), natural mortality coefficient (M) and fishing mortality coefficient (. F) is 7.85, 3.15, and 4.7 years, respectively, from a study of the rate of replacement of the yield and SSB analysis also revealed that the crab population has been heavily exploited over the limit biologically. Including fishing mortality (F) was increased further. That are considered important to reduce the rate of renewable bio-mass, at 21.1%, and the biomass of the spawning population is 37.6%.
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