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Light Impact Technical Terms
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Anadromous - Species, including salmon, which hatch in fresh water, migrate to saltwater for their adult life and then return to freshwater to reproduce
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Diversion dam - A dam that reroutes water from its natural waterway
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Dissolved Gas - Air dissolved in water when water is released down the face of a dam. Water that is supersaturated with dissolved gases can injure or kill fish and other aquatic resources.
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Fry - young, recently hatched fish
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Instream Flows - The amount of water flowing in a particular reach of a river. Fish in each river are adapted to a particular pattern of instream flow as it varies naturally over the course of the year.
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Off-channel Habitat - areas off the main, fast-flowing river channel where salmon eggs are laid and fry emerge. Healthy off-channel areas are critical to salmon recovery.
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Ramping - Changing the flow of a river through a dam powerhouse.
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Ramping Rates - The speed at which we change flow of a river through a dam or powerhouse
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Redd - Gravel nest where salmon deposit eggs
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Run - All the stocks of a single species of fish migrating back to their river or stream of origin
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Smolt - A juvenile salmon migrating to sea
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Spawn - To lay and fertilize eggs
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Spawning habitat - Generally clean gravel without silt or mud, preferred by salmon for spawning.
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Stock - A local population of fish that returns to its river or stream of origin
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Watershed - The land area that drains to a single river or stream
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