Blue swimming crabs are an important source of income for fishermen in Malaysia, also known as "ketam bunga" or "ketam renjong" as locals call them. The high price and increased demand within the community will cause overexploitation of blue swimming crab production. In 2003, total landings of P. pelagicus were approximately 175,000 tonnes, decreasing to 165,000 tonnes in 2004 (FAO Fish Stat, 2009). This decline due to overexploitation has an impact in some Asian countries (Ikhwanuddin et al., 2005). In Malaysia, Department of Fisheries (DOF) statistics show that landings of P. pelagicus were 3,514 tonnes in 2007 and increased to 4,427 tonnes in 2008, but landings decreased in 2009 to 3,057 tonnes. These decreases total crab fisheries in territorial waters in Malaysia as an early indicator of shortage will be for crabs in the future, due to increased catches and damage of coastal environments, the abundance of P. pelagicus has rapidly declined. However, cultivated P. pelagicus have been important since the beginning of the last decade due to the high demand for live crabs and crab products in the export market. Due to their rapid growth rate relative to market size (Josileen and Menon, 2005) and relative ease of hatchery production (Walker, 2006), aquaculture interest in this species is growing. Blue swimming crabs are of high value and quality, a profitable export market to Singapore, Kuala Lumpur, Hong Kong, South Korea, Taiwan and Japan by Australian producers (Stevens, 1997). Today, P. pelagicus is cultivated for production of the lucrative soft-shell crab market on recirculating systems and lined ponds in Australia (O'Neill, 2003 and Walker, 2006). Blue swimming crabs are not only popular in Malaysia, but in another country many crabs caught along the coast of Dar es Salaam in Tanzania (Chande and Mgaya, 2004), Bardawil lagoon in North Sinai in Egypt (Abdel Razak et al ., 2006), Park Bay and the Gulf of Mannar in India, the western coast of South Australia in Australia (Dixon et al. , 2008) and in the southern Trang province of Thailand (Sawusdee and Songrak, 2009). An estimate of blue swimming crabs caught in waters around South Australia from 2007 to 2008 was 669 tonnes, valued at $5,740,000 by Knight and Tsolos (2009). Landings of blue swimming crabs in India increased from 20,000 to 48,380 tonnes, or 30%, in the years 1977 to 2005 (Samuel et al..