Glossary R

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radio transmitter: A device implanted into or attached to an organism that emits a specific frequency detected and interpreted up by a telemetry receiver.
receiver: A device used in telemetry to detect specific frequencies emitted from a transmitter and to locate and decode the transmitter's signal.
redd: A redd is a depression created in the gravel where fish deposit their eggs (like a nest).
rheotaxis: The alignment of fish in the current (upstream/downstream) using their sensory organs such as the lateral line. Stream fishes, such as the cutthroat trout typically face upstream for feeding purposes.
resident: A fish that completes its whole life in a small tributary stream.
riffle: Shallow stream reaches which flow over rough bed material (like cobble), causing small ripples or waves (turbulence).
riparian area (zone): The area and vegetation adjacent to streams and rivers.; Of, on, or relating to the banks of a natural course of water.