The Greater Noakhali and Greater Barisal areas of southern Bangladesh include large numbers of rivers, ponds, floodplains, waterlogged paddy fields, canals and tributaries of the Meghna River. These areas have a long history of fisheries production. In the past, fish farmers have depended on natural fish seed collected from breeding grounds such as Halda River. However, the expansion and intensification of aquaculture has reached a point where the demand for fish seed can only be satisfied by hatchery production.