Glossary
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Radio-telemetry
Automatic measurement and transmission of data from remote sources via radio to a receiving station for recording and analysis.
Ramus
A branch; a projecting part.
Rate of exploitation
The fraction, by number, of the fish in a population at a given time, which is caught and killed by man during the year immediately following . The term may also be applied to separate parts of the stock distinguished by size, sex, etc. Also called; *fishing coefficient .
Rate of removal
An inexactly-defined term that can mean either rate of exploitation or rate of fishing--depending on the context .
Rate of utilization
Similar to rate of exploitation, except that only the fish landed are considered. The distinction between catch and landings is important when considerable quantities of fish are discarded at sea.
Ray
One of the supports of a fin.
Rear
To feed and grow in a natural or artificial environment.
Rearing
Refers to the amount of time that juvenile fish spend feeding in nursery areas of rivers, lakes, streams and estuaries before migration.
Re-colonization
The reestablishment of a salmonid stock in a habitat that the species previously occupied.
Recovery project
Artificial production projects primarily designed to aid in the recovery, conservation or reintroduction of particular natural population(s).
Recruitment
Addition of new fish to a defined life history stage by growth from among smaller size categories. Often used in context of management, where the stage is the point where individuals become vulnerable to fishing gear.
Redd
A nest of fish eggs consisting of gravel, typically formed by digging motion performed by an adult female salmon.
Relative abundance
An estimate of actual or absolute abundance; usually stated as some kind of index; for example, as bottom trawl survey stratified mean catch per tow.
Remote site incubator
A lightweight, dark colored plastic barrel incubator that employs plastic substrate (hatching medium), and can be sized to accommodate 5,000 to 125,000 eggs per incubator. They are used mainly for incubating chum salmon eggs.
Reproduce
To produce offspring.
Research survey
Survey at sea, on a research vessel, allowing scientists to obtain information on the abundance and distribution of various species and/or collect oceanographic data. Ex: bottom trawl survey, plankton survey, hydroacoustic survey, etc.
Riffle
A shallow gravel area of a stream that is characterized by increased velocities and gradients, and is the predominate stream area used by salmon for spawning.
Riparian
Referring to the transition area between aquatic and terrestrial ecosystems. The riparian zone includes the channel migration zone and the vegetation directly adjacent. to the water body, that influence channel habitat through alteration of microclimate or input of LWD.
River mile
A statute mile measured along the center line of a river. River mile measurements start at the stream mouth (RM 0.0).
Riverine
Referring to the entire river network, including tributaries, side channels, sloughs, intermittent streams, etc.
Riverine sockeye
Small populations of sockeye salmon that spawn and rear in some rivers systems that have no available lake for rearing.
Roe
The eggs of fishes.
Run
A group of fish of the same species that migrate together up a stream to spawn, usually associated with the seasons, e.g., fall, spring, summer, and winter runs. Members of a run [may] interbreed, and may be genetically distinguishable from other individuals of the same species.
Run reconstruction
A post season accounting of all salmon escaping and harvested from individual stocks or management areas.