In 2008, Bangladesh was the ninth largest aquaculture producing country in the world, supplying 12% of global aquaculture production excluding China (FAO 2010). The aquaculture species mainly includes large carp namely rohu Labeo rohita (Hamilton 1822), mrigal Cirrhinus mrigala (Bloch 1795), catla Catla catla (Hamilton 1822), grass carp Ctenopharyngodon idella (Valenciennes 1844), silver carp Hypophthalmichthys molitrix (Valenciennes 1844)