riffle
Area of a stream or river characterized by a rocky substrate and turbulent, fast-moving, shallow water.
riparian ...
riffle : A rocky shoal or sandbar lying just below the surface of a waterway. The choppy water created by such sand bars and shoals is also referred to as a riffle.
Riffle: A shallow, gravelly area of streambed with swift current. Used for spawning by salmonids and other fishes. The most productive area of a stream.
In contrast to riffles, glides have no surface turbulence.
glochidium the larva of a freshwater mussel that parasitizes the gills and scales of a fish during approximately the larva's first thirty days of life
GPS Global Positioning System.
 See also: Dissolved oxygen, Nitrate, Table, Wetland, Toxic substances
  
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