Females of Scylla serrata attained sexual maturity after reaching 80 mm carapace width and above. Fifty per cent of females at size range 91-100 mm carapace width were sexually mature. The growth rate of abdomen width or length with respect to either carapace width or length was generally at much higher side in mature females than in the immature specimens. A sharp transition at 80 mm carapace width indicated the morphological changes accompanied with the sexual maturity. The relationship between abdomen allometry and carapace measurements was highly significant (P

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