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North Carolina Department of Environment Quality

NC Department of Environment and Natural Resources
Marine Fisheries - Fisheries Glossary T-Z

Marine Fisheries

V

VPA - See virtual population analysis.

Virgin Stock - A stock of fish with no commercial or recreational harvest. A virgin stock changes only in relation to environmental factors and its own growth, recruitment, and natural mortality.

Virtual Population Analysis (VPA) - A type of analysis that uses the number of fish caught at various ages or lengths and an estimate of natural mortality to estimate fishing mortality in a cohort. It also provides an estimate of the number of fish in a cohort at various ages.
 

Y

Year-Class - The fish spawned and hatched in a given year, a “generation” of fish.

Yield - The production from a fishery in terms of numbers or weight.

Yield Per Recruit - A model that estimates yield in terms of weight, but more often as a percentage of the maximum yield, for various combinations of natural mortality, fishing mortality and time exposed to the fishery.

*Added by Wallace et al.

Z

z - See intrinsic rate of increase.

Z
- See total mortality.

Z’ - See disappearance.
 

N.C. Division of Marine Fisheries • 3441 Arendell Street • Morehead City, NC 28557 • 252-726-7021 or 800-682-2632

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