| Galaxea |
A stony coral characterized by massive, usually dome-shaped
colonies with individual corallites forming raised bumps on the surface |
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| Gambusia |
mosquito fish, Family Poecilidae, G. affinis, native to the southeastern
United States, is the best known and is widely introduced for mosquito
control; other species are endangered |
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| Ganoid scale |
the thick, enamellike epidermal structures of gars, sturgeons, and
related fish |
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| Gasterosteus |
sticklbacks, brackish-water and freshwater fish of North America
and Europe that are often maintained in specialized aquariums |
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| Gastropod |
a snail or mollusk with a univalve shell and in which the developing
larva undergoes twisting, or torsion, resulting in the juxtapositioning
of anterior and posterior ends of the alimentary tract |
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| Gastrotrich |
microscopic freshwater inverterbrates, characterized by a series
of bristles on the posterior portion of the body; often a food source
for fish fry or larger invertebrates |
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| Gelbstoff |
literally, "yellow matter" in German, a term coined to
refer collectively to the organic compounds that produce yellowing
of aquarium waters, both fresh and marine |
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| Gene |
a unit of DNA that codes for a single protien molecule |
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| Gene flow |
the movement of genetic information between two populations of a
species as a result of crossbreeding |
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| Gene pool |
the total amount of genetic diversity within a species |
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| Genital papilla |
a tube extended from the urogenital opening, used for egg or sperm
deposition; typically found in fish that attach their eggs to a solid
object |
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| Genus |
plural: genera: a group of closely related species |
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| Geophagus |
"earth eater," South American cichlids that feed by taking
substrate material into the mouth and expelling it through the gill
covers to obtain burrowing organisms |
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| GH |
abbreviation for "general hardness" or the total amound
of dissolves salts of calcium and magnesium present in a sample of
water |
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| Gill |
the anatomical structure in some aquatic organisms that premits
gas exchange across the walls of capillaries between the bloodstream
and the surrounding water |
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| Gill cover |
the opercle, or flap that protects the gills of fish |
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| Gill filaments |
in fish, the smallest subdivisions of the gills |
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| Gill raker |
structures that support and give rise to the gill filaments of fish |
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| Gingylostoma |
nurse sharks, so named because of the sucking sound they make when
feeding |
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| Glutinant |
any substance that causes the clumping of small particles to form
a jellylike mass |
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| Gnathonemus |
elephant nose fish, Family Mormyridae, from the Congo River, Africa |
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| Gobiodon |
coral gobies, tropical marine fish from the Indo-Pacific region
living among the branches of various hard and soft corals |
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| Gobiosoma |
sharpnosed gobies, fish from the tropical Atlantic and Caribbean,
including the neon goby, G. oceanops, and other popular aquarium species;
several can be commercially produced through aquaculture |
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| Gobius |
type genus of Family Gobiidae, characterisically with the pelvic
fins fused to form a suckerlike appendage for holding onto solid surfaces
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| Goniastera |
a stony coral, Family Faviidae, with large, hexagonal corallites
forming a hemispherical colony |
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| Goniopora |
poritid stony corals with large, elongated flowerlike polyps, often
imported but seldome successfully adapted to aquarium care |
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| Gorgonia |
sea fans, gorgonian soft corals in which the body branches are repeatedly
fused to form a network |
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| Gorgonian |
any of the eight-tentacled anthozoans producing an axial skeleton
covered by a usually colorful outer tissue layer that gives rise to
the polyps |
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| Gorgonin |
the structural protein comprising the axial skeleton of a gorgonian |
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| Gourami |
labyrinth fish in several genera characterized by modification of
the pectoral fins into sensory "feelers" |
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| Gracillara |
a macrophytic red marine alga often cultivated as fish food and
for display |
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| Gramma |
small sea basses of the tropical Atlantic and Caribbean frequently
kept in aquariums because of their bright coloration, nonaggressive
temperament, and hardiness |
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| Gravel |
pieces of rock ranging in size from 1/16 to 1/4 inch (1.6 to 6.3mm)
in diameter |
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| Ground fault circuit interrupter (GFCI) |
an electrical device that compares the current flowing on one side
of a circuit with that flowing on the opposite side, and that opens
the circuit to prevent personal injury when a difference greater than
a few milliamps is detected |
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| Grounding |
providing a path for electricity to travel into the earth, usually
to eliminate an unwanted charge or to protect personnel from injury
by providing a path of least resistance for current flow |
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| Guanin |
a substance in the scales of fish giving them an iridescent sheen |
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| Gyrinocheilus |
algae-eating freshwater fish from Asia that as adults may also attack
other fish housed in the same aquarium |
