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Riffle Window |
Riffles, the shallow gravel areas in streams, provide fish with fresh air and groceries. Churning, fast-moving water mixes air into the stream, providing oxygen that allows fish and aquatic insects to survive and thrive. Nooks and crannies in the gravel provide abundant habitat for aquatic insects. Insects provide most of the diet for many fish species. Facing upstream so oxygen-rich water flows over their gills, fish lie in wait for insects to drift into their feeding area.
