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North Carolina Department of Environment Quality

NC Department of Environment and Natural Resources
Marine Fisheries - Fisheries Glossary F-J

Marine Fisheries


 

G

GLM - See general linear model.

GSI - See gonosomatic index.

General Linear Model (GLM) - A mathematical formula that relates one biological factor to another. Once a mathematical relationship is established, scientists use the formula to predict one factor over another.

Gonosomatic Index (GSI) - The ratio of the weight of a fish’s eggs or sperm to its body weight. This is used to determine the spawning time of a species of fish.

Groundfish - A species or group of fish that lives most of its life on or near the sea bottom.

Growth - Usually an individual fish’s increase in length or weight with time. Also may refer to the increase in numbers of fish in a population with time.

Growth Model - A mathematical formula that describes the increase in length or weight of an individual fish with time.

Growth Overfishing - When fishing pressure on smaller fish is too heavy to allow the fishery to produce its maximum poundage. Growth overfishing, by itself, does not affect the ability of a fish population to replace itself.


H

Harvest - The total number or poundage of fish caught and kept from an area over a period of time. Note that landings, catch, and harvest are different.

Head Boat - A fishing boat that takes recreational fishermen out for a fee per person. Different from a charter boat in that people on a head boat pay individual fees as opposed to renting the boat.

Histogram - A method of showing data in a graph. The data appears as bars running up and down (vertical) or sideways (horizontal).
 

I

ITQ - See individual transferable quota.

Incidental Catch - See bycatch.

Independent Data
Independent data are collected from sources other than fishing activity using a statistically designed sampling method. These data are usually obtained through federal, state, or academic research program

Individual Transferable Quota - A form of limited entry that gives private property rights to fishermen by assigning a fixed share of the catch to each fisherman.

Industrial Fishery - A fishery for species not directly used for human food. An example is menhaden.

Instantaneous Mortality - See fishing mortality, natural mortality, and total mortality.

Intrinsic Rate of Increase (z) - The change in the amount of harvestable stock. It is estimated by recruitment increases plus growth minus natural mortality.

Isopleth - A method of showing data on a graph which is commonly used in determining yield-per-recruit.


J

Juvenile - A young fish or animal that has not reached sexual maturity.
 

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

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