The scheme is run by local businessmen, who pay fishermen to enter the Javari Valley, catch fish, and deliver it to them. One of the most valuable targets is the world’s largest freshwater fish with scales, the arapaima. It weighs up to 200 kilograms (440 pounds) and can reach 3 meters (10 feet). The fish is sold in nearby cities, including Leticia, Colombia, Tabatinga, Brazil, and Iquitos, Peru.