Mangrove crabs are member of the Family Portunidae (Order Dechapoda; Class Crustacea). The growth of
crustaceans are characterized by the process of molting. Order Dechapoda is characterized by the presence of five
pairs of legs, the first pair of legs are called claws that act as a catcher/food holder, the fifth pair of legs in a fanshaped
(flat) serves as the swimming leg, and the rest are for crawling/walking legs. With the claws and legs, crab
can run fast on land and they can swim quickly in water using the swimming legs so theay are classified as
swimming crab (Portunidae). Genus Scylla is characterized by the oval shape of the carapace with the front has 9
spines on both left and right sides and 4 spikes in between the eyes. There are 3 types of mangrove crabs are
considered to have a potential market; they are Scylla serrata, Scylla oceanica, and Scylla transquebarica. S. serrata
can be distinguished from the other two species based on morphology particularly clear form of spines on the
carapace, the claws and the dominant colour on the body [1], [2].