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Gamete
A cell that fuses with another cell during fertilisation in organisms that reproduce sexually.
Gamma ray
Electromagnetic radiation with wavelengths shorter than approximately one tenth of a nanometer.
Garial
A large fish-eating Indian crocodilian, Gavialis gangeticus, with a very long slender snout.
Gastropod
Snails and other molluscs that typically possess a coiled dorsal shell and a ventral creeping foot.
GBRMPA
Great Barrier Reef Marine Park Authority
Gear restriction
A type of input control used as a management tool whereby the amount and/or type of fishing gear used by fishers in a particular fishery is restricted by law.
Gear unit
A standard measure to manage fisheries (e.g. one gear unit = 1000 metres of net).
Gene flow
The transfer of genetic DNA codes between populations
Genera (genus)
A taxonomic group of organisms, one level higher than species.
General Use Zone
Areas where recreational activities such as fishing are permitted.
Generalist species
Species capable of thriving in a wide range of environmental conditions and able to utilise a variety of ecosystem resources.
Germinate
To sprout or grow.
Gestation
The period during which an embryo develops before birth.
Gharial
Large fish-eating Indian crocodilian, with a very long slender snout.
Ghost fishing
Discarded or lost fishing gear that continues to remain in the aquatic environment, potentially trapping and killing fish and other species.
Gill
Respiratory organ specialised for gaseous exchange in water, allowing animals to live in water.
Gill arch
The u-shaped cartilaginous or bony structures that support the gill filaments.
Gill filament
Soft, red, fleshy part of the gills, through which oxygen is taken into the blood from the water passing through the gills.
Gill net
A type of passive fishing gear consisting of panels of net held vertically in the water column, either in contact with the seabed or suspended from the sea surface, such that fish attempting to swim through them are entangled. The mesh size of the net determines the size range of fish caught, as smaller fish are able to swim throguh the meshes. Fish are held behind the gill plate as the head passes through.
Gill raker
The bony projections on the front of the gill arches.
GIS
Geographic Informaton System
Global positioning system
A device that uses satellite signals to accurately determine a vessel’s position and course.
Gonad
Organ producing eggs or sperm.
GPS
See Global positioning system
Grading
Sorting out animals into sizes of the same class.
Gravity
The force of attraction between all matter.
Grazers
Animals which feed (graze) on small organic particles and algae.
Ground-truthed
To confirm remotely obtained data by physically visiting a site.
Grow out
The period which juveniles grow to a market size.
Growth bands
Similar band in a part of an animal, such as a fish ear bone, marking a period of growth.
Growth overfishing
Occurs when too many small fish are being harvested from a particular fishery, such that a restraint on them being caught would ultimately lead to an overall increase in yield from the fishery.
Groyne
Structure projecting into sea designed to prevent erosion.
Gulf
An area of ocean forming a coastal indentation, often larger than a bay, e.g., Exmouth Gulf.
Guyot
A flat-topped submarine mountain (seamount).
GVP
Gross Value of Production
Gyotaku
The traditional Japanese art of fish printing.
Gyre
A circular system of ocean currents rotating clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere.