Productive areas are consistently found where structural elements create ambush points. Key spots include the deep pools at the base of riffles, undercut banks with overhanging vegetation, submerged logjams, and the confluence of smaller tributaries. Areas with transitions in current speed, such as where a fast run meets a slow pool, are also reliable. The sections downstream of any rocky points or boulder fields that create current seams are particularly good for targeting Tucunaré and larger Characins.