The stock structure of the blue swimming crab is unknown; and the species is distributed through the Indian and West Pacific oceans (FAO, 2013). There is some evidence of the presence of more than one stock in northeastern Sri Lankan district waters (Creech 2014) . 

The fishery takes place from southwest coastal waters just north of Colombo (6.9271° N, 79.8612° E), and extends northward to the northeast coast (approximately 8.6438° N, 81.0755° E) (Creech 2014) . Primary fishing areas are in a few locations on the Sri Lankan side of Palk Bay, on the east coast.  The map regards the species’ distribution along the Sri Lanka Economic Exclusive Zone.