Glossary
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Game fish
A fish that is regulated by law for recreational harvest.
Gape
To open the mouth wide. In Zoological terms, it means the measurement of the widest possible opening of a mouth.
Gear limits
Restrictions placed on sport or commercial fishing gear, which are used to control the take of fish.
Gene
A specific unit of genetic material (DNA) that encodes the information for a single genetic trait.
Gene Conservation Area
Oregon Department of Fish and Wildlife Term
Gene flow
The rate of entry of non-native genes into a population, measured as the proportion of the alleles at a locus in a generation that originated from outside of the population. Can be thought of as the genetically successful stray rate into a population. See also stray rate and homing rate.
Gene pool
The total variety and proportions of alleles within a population.
Genetic diversity
the heritable variation within and between populations of species. In this context, this encompasses all the taxonomic classifications below species that are a result of environmental heterogeneity and reproductive isolation.
Genetic drift
The random fluctuation of allele frequencies in a population resulting from the sampling of gametes to produce a finite number of individuals in the next generation.
Genetic risk
The probability of an action or inaction having a negative impact on the genetic character of a population or species.
Genetic stock identification
A method that can be used to characterize populations of organisms based on the genetic profiles of individuals. The GSI process consists of a series of steps: (1) collect selected tissues from a representative sample of individuals from the population(s) under investigation; (2) develop genetic profiles for the individuals in each population by conducting starch-gel electrophoresis and histo-chemical staining using tissue extracts; (3) characterize each population by aggregating the individual genetic profiles and computing allele frequency distributions; and (4) conduct statistical tests using the allele counts characterizing each population to identify significantly different populations.
Genome
The total genetic composition of an individual. The complete genetic information possessed by an organism.
Genotype
The particular combination of genes present in the cells of an individual.
Gill rakers
A series of projections located along the front edge of the gill arch.
Gillnet
Fishing gear: netting with weights on the bottom and floats at the top used to catch fish. Gillnets can be set at different depths and are anchored to the seabed.
Gills
The fleshy, and highly vascular organs comparable to lungs used in aquatic respiration.
Glide
A part of a river containing a smooth flow of water with an unbroken surface.
Gradient
The amount of vertical drop a stream experiences over a given distance.
Grilse
Salmon less than 22 inches (56cm) Fork Length (FL).
Groundfish
Species of fish living near the bottom such as cod, haddock, halibut and flatfish.
Growth overfishing
The rate of fishing, as indicated by an equilibrium yield-per-recruit curve, greater than which the losses in weight from total mortality exceed the gain in weight due to growth. This point is defined as Fmax.