This type of fishing can be divided into three categories: (1) small-scale commercial fishing (also referred to as "artisanal"), which can be further broadly subdivided into those operations supplying domestic markets and those operations producing export commodities; (2) subsistence fisheries, which support rural economies and are extremely important to the region's nutrition and food security; and (3) the industrial-scale shrimp fisheries, which in the region only occur in Papua New Guinea. The region's fishery resources can be broadly split into two main categories: oceanic (offshore) and coastal (inshore). Oceanic or offshore resources include tunas, billfish and allied species. They are characterized by an open-water pelagic habitat and potentially extensive individual movements. Coastal or inshore resources include a wide range of finfish and invertebrates.