The most productive areas are typically found where the stream's character changes. Confluences with smaller tributaries often create nutrient-rich seams that attract baitfish and predators. Deep pools adjacent to faster riffles are prime holding water for large dorado. Undercut banks, especially those with overhanging vegetation or root systems, provide excellent cover for tararira. Logjams and other woody debris in the water create essential structure that holds fish throughout the stream.