Iran has 1,786 kilometers of coastline on the Persian Gulf and the Gulf of Oman. These southern waters are rich in fish and other marine resources. In 2004 the catch off the southern coast totaled 299,000 tons. This represented an average annual increase of 12.6 percent since 1976. The southern catch either is used directly by households and restaurants or processed and preserved by industry. Expansion of the fishery infrastructure would enable the country to harvest an estimated 700,000 tons of fish annually from the southern waters. However, increased pollution from the oil industry and other enterprises poses a serious threat to this area's fishing industry.