As Indonesia is the world's largest archipelago (13,667 islands), fish is a readily-available source of animal protein for domestic consumption. In 2000, the total catch was 4,140,045 tons, ranking Indonesia sixth in the world. Fishing is more important than statistics indicate, because the catch of many part-time fishermen never enters trade channels. Commercial fishing is confined to a narrow band of inshore waters, especially off northern Java, but other fishing also takes place along the coast, as well as in the rivers, lakes, coastal swamps, artificial ponds, and flooded rice fields. The government has stocked the inland waters, encouraged cooperatives to provide credit facilities, introduced improved fishing methods, provided for the use of motorized fishing boats and improved tackle, and built or rehabilitated piers. Fish and fish product exports had a value of $1,584,454,000 in 2000.