Glossary
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Name Subsection Description
Aeration Salmon to supply the water with air.
Air Pump Salmon provides aeration for the classroom incubator.
Alevin Salmon newly-hatched fry which still have the yolk sac attached.
Ammonia Salmon ommon waste product of eggs and fry, occurs as NH3 gas.
Biological Filter Salmon microorganisms which develop in the gravel layer above the undergravel filter; consume the deadly ammonia that fish excrete and convert it to a harmless form of nitrogen.
Brood Stock Salmon sexually mature fish from which eggs and milt are taken.
Brood Year Salmon year eggs are produced.
Button-Up Salmon the process by which the belly closes once the yolk sac is consumed; sometimes called swimup fry.
Chinook Salmon Salmon species tshawytscha ("tau-wee-cha")
Chum Salmon Salmon species keta ("kee-tas")
Coagulated Yolk Salmon condition found in sacfry characterized by discolored yolk and abnormal swimming behavior; caused by various stress factors including rough handling or light exposure.
Coastal Cutthoat Salmon Salmon
Coho Salmon Salmon species kisutch ("ki-sooch")
Daily Progress Record Salmon form used to document number of egg and fry mortalities during the incubation period.
designated fish release site Salmon form which designates specific sites for fry; mandated by STEP biologist and district biologist approval through management goals outlined in basin plans and the Wild Fish Management Policy.
Dissolved Oxygen (DO) Salmon amount of oxygen dissolved in water; measured in parts per million (ppm); 7-12 ppm is required for fish survival.
Egg Salmon mature female sex cell, ovum.
Egg Request Salmon form which specifies the number and type of eggs requested by the classroom incubator operator; must be approved by the STEP biologist prior to initiation of project.
Eyed Egg Salmon a partially developed egg which shows the embryo's eyes; somewhat less sensitive to light or shock than a green egg.
Fitness Salmon relative ability of an organism to survive and transmit hereditary characteristics to the next generation.
Fry Salmon young fish which have left the gravel to seek food, yolk sac is no longer present.
Gang Valve Salmon a tool used to divert output from an air pump in several directions.
Green Eggs Salmon newly spawned eggs; eggs are very tender at this stage of development and highly susceptible to damage or death.
Habitat Salmon an area that provides an organism's needs for food, water, and shelter.
Hatchery Salmon a facility at which eggs are collected and incubated, or where eggs are hatched, or where fish are reared for released and harvest.
Hatchery Fish Salmon a fish spawned, incubated, and/or reared under artificial conditions.
Incubation Period Salmon period from fertilization of the egg until beginning of active feeding by fry.
Incubator Salmon device for artificial rearing of fish from fertilization of the egg to release of fry.
Metabolism Salmon vital processes which make new body tissues and excrete waste materials.
Milt Salmon sperm-carrying fluid from male fish.
Native Fish Salmon fish stock which originates in the local area and is adapted to local habitat conditions.
ODFW Salmon Oregon Department of Fish and Wildlife, agency responsible for management of Oregon's fishery resources.
Onchorhynchus Salmon (on-ko-rink-us) The genus name for all salmon. (And the name of our Tour Guide)
Ovum Salmon female sex cell.
Parts Per Million (ppm) Salmon one part of a substance by weight contained in one million parts of a solution equal to milligrams/liter (mg/1).
pH Salmon measure of acidity or alkalinity of a solution ranging from 0 to 14; values above 7 are alkaline, below 7 are acid; a pH of 6.5 - 7.5 is required for egg and fry survival.
Picking Salmon removal of dead eggs or fry from tray or gravel.
Pink Salmon Salmon Gorbuscha ("gor-boo-scha")
Project Proposal Salmon form for describing a STEP project; required for participation in a classroom incubator project; must receive necessary approvals prior to implementation.
Redd Salmon a nest in the bottom of a stream dug by a female fish during spawning; the eggs incubate in the gravel until hatching.
Report of Operations Salmon form used to summarize the results of a classroom incubator project; includes egg and fry mortalities, release information, and other comments about the project.
Riser Tubes Salmon extensions of the undergravel filter, provide water circulation and aeration of the classroom incubator.
Sac-Fry Salmon an alevin, a newly hatched fish with the yolk sac still attached.
Salmon Genus Salmon Oncorhynchus ("on-ko-rink-us")
Salmonid Salmon a fish in the salmon or trout family.
Smolt Salmon juvenile or steelhead that has undergone physical changes to prepare for life in saltwater.
Sockeye Salmon Salmon species nerka ("ner-ka")
Spawning Salmon in the fish, the act of laying and fertilizing the eggs.
Spawning Survey Salmon an evaluation of a particular stream for evidence of spawning fish; redds, fish carcasses, and live fish are counted.
Sperm Salmon male sex cell.
Stealhead Salmon species mykiss ("my-kiss")
STEP Salmon Salmon-Trout Enhancement Program , a volunteer program within the Oregon Department of Fish and Wildlife (ODFW).
STEP Biologist Salmon one of the several ODFW biologist assigned to work with volunteers on salmon and trout restoration and enhancement projects.
Stress Factor Salmon any factor which adversely influences the capability of a fish to preform normal functions.
Temperature Salmon one of the key habitat components in the classroom incubator; temperatures of 42-55 F are required for egg or fry survival.
Temperature Units (TU) Salmon a measurement unit of accumulated temperature, 1 Fahrenheit (F) above 32 F for 24 hours equals 1 TU ; used to predict when a fish egg will hatch.
Tender Stage Salmon period of early development during which the embryo is highly sensitive to shock, from a few hours after fertilization to the time eyes become evident in the embryo; also called "green."
TU's Salmon temperature units; used to predict when a fish egg will hatch.
Undergravel Filter Salmon filter plate placed beneath the gravel in an aquarium; acts as a biological filter to remove waste products of the eggs and the fry from the water.
VO # Salmon tracking number assigned to an egg incubation project by the STEP biologist.
Water Hardening Salmon process of water absorption by eggs, occurs shortly after fertilization; eggs are very tender after water-hardering to the time they "eye-up."
Wild Fish Salmon any naturally spawned fish belonging to a native population.
Yolk Sac Salmon sac attached to a newly hatched fish containing a balanced diet for its early growth.
Alternating current (AC) Water Power Electric current that reverses direction many times per second.
Cavitation Water Power Noise or vibration causing damage to the turbine blades as a results of bubbles that form in the water as it goes through the turbine which causes a loss in capacity, head loss, efficiency loss, and the cavity or bubble collapses when they pass into higher regions of pressure.
Direct current (DC) Water Power Electric current which flows in one direction.
Efficiency Water Power A percentage obtained by dividing the actual power or energy by the theoretical power or energy. It represents how well the hydropower plant converts the energy of the water into electrical energy.
Flow Water Power Volume of water, expressed as cubic feet or cubic meters per second, passing a point in a given amount of time.
Headwater Water Power The water level above the powerhouse.
Low Head Water Power Head of 66 feet or less.
Penstock Water Power A closed conduit or pipe for conducting water to the powerhouse.
Tailrace Water Power The channel that carries water away from a dam.


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