Glossary R
- 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.
