Mud Crab (often called Scylla serrata or mangrove crab, although both terms are highly ambiguous, as well as black crab) is an economically important species of crab found in the estuaries and mangroves of Africa, Australia and Asia. In their most common form, the shell colour varies from a deep, mottled green to very dark brown.
How long do you cook a crab?
Lower each crab into the boiling water with its legs facing down. While the crabsare cooking, prepare an ice bath by filling a large bowl with cold water and ice.
Allow each crab to cook for approximately 15 minutes (once they float to the top, give them an extra 2-3 minutes)