Productive areas are consistently found near any form of structure that provides a current break or ambush point. Key spots include the mouths of smaller tributaries entering the igarapé, deep undercut banks along outside bends, submerged logs and fallen trees (known as "galhadas"), and the confluence zones where Igarapé Matupiri meets the main Rio Matupiri. The transition areas between fast and slow water, such as the heads and tails of pools, are also reliable places to find actively feeding fish.