| Gabelbissen |
| Gabelrollmops |
| gaff |
| gaffel bitar |
| Gaffel biter |
| Gaffelbidder |
| Galaxiids |
| Galeomorphii |
| Galjoen fishes |
| gall bladder |
| game fish |
| gamete |
| gametes |
| gamone |
| ganoid scales |
| ganoine |
| gap |
| gap length |
| gape |
| Garo |
| Gáros |
| gars |
| Garum |
| gas bladder |
| gas bubble disease |
| gas supersaturation |
| Gaspé cure |
| Gaspévirket klipfisk |
| gastric caecum |
| gastrolith |
| gastropod mollusks |
| Gastropoda |
| gastropods |
| gastrula |
| gear |
| Gebakken bokking |
| Gebakken gemarineerde haring |
| gefilte fish |
| Gekruide pilchards |
| gel |
| gelatinous |
| geminate species |
| gempylotoxic fishes |
| gempylotoxism |
| Gendarme |
| gene |
| gene bank |
| gene pool |
| genealogy |
| genecology |
| genera |
| generation |
| generation time |
| generic name |
| genetic distance |
| genetic diversity |
| genetic drift |
| genetic marker |
| genetic material |
| genetic resources |
| genetics |
| genipores |
| genital papilla |
| genitalia |
| genoholotype |
| genome |
| genotype |
| genus |
| genus group |
| genus-group name |
| geodesic |
| Geographic Information System |
| geology |
| Georeferenced data |
| George Mason University |
| Georges Bank |
| geostrophic flow |
| geotactic |
| geothermal vent |
| germ ring |
| germinal disc |
| germplasm |
| Gerookte haaiwangen |
| gestation period |
| Ghost flatheads |
| Ghost pipefishes |
| Giant gourami |
| Gibberfishes |
| gibbing |
| gig |
| gill |
| gill arch |
| gill area |
| gill chamber |
| gill cover |
| gill filaments |
| gill membranes |
| gill opening |
| gill raker counts |
| gill rakers |
| gill slits |
| gillnet |
| gin pole |
| Gipping |
| girth |
| Gisukeni |
| glabrous |
| glacial lake |
| glacial relict |
| gland |
| Glasgow pale |
| Glass perchlets |
| glazing |
| glenoid region |
| Global Positioning System |
| global warming |
| globiform |
| glycerin |
| gnathal |
| gnathoproctal length |
| Gnomefishes |
| Goatfishes |
| Gobies |
| goiter |
| Golden cure |
| Golden cutlet |
| Gombessa |
| gonad |
| gonochorism |
| gonochoristic |
| gonopodium |
| gonosomatic index |
| Goodeids |
| Goosefishes |
| gorge |
| gorgonian |
| gouge |
| Gouramies |
| Govii |
| Graavisuolattu lohi |
| Gracilicutes |
| graduated |
| Graflax |
| Grammicolepidids |
| grammistan |
| granular |
| granular yolk |
| granulated |
| granulations |
| Graphical User Interface |
| grasp |
| gravel |
| gravel beach |
| Graveldiver |
| gravid |
| Gravlaks |
| Gravlax |
| grazer |
| Great Australian Bight |
| Great Law of Fishing |
| Green fish |
| Greeneyes |
| greenhouse effect |
| Greenland Sea |
| Greenlings |
| gregarious |
| Grenadiers or rattails |
| Grice Marine Biological Laboratory, Charleston, South Carolina |
| grilse |
| Grinnell College, Iowa |
| groin |
| GROMS migrant |
| grooming |
| groove |
| groundfish |
| groundwater |
| group |
| group behavior |
| group spawning |
| group-synchronous development |
| grow-out |
| grow-out operations |
| growth |
| growth model |
| growth overfishing |
| growth rate |
| growth ring |
| Grunters |
| Grunts |
| GTZ |
| Guanin |
| guanine |
| guanophore |
| guanophores |
| guarder |
| guarding |
| gubbins |
| guild |
| Guinamos alamang |
| Guitarfishes |
| gular |
| gular bone |
| gular fold |
| gular plate |
| gular region |
| Gulf Coast Research Laboratory Museum, Mississippi |
| Gulf of Aden |
| Gulf of Alaska |
| Gulf of Aqaba |
| Gulf of Boni |
| Gulf of Bothnia |
| Gulf of California |
| Gulf of Finland |
| Gulf of Guinea |
| Gulf of Iran (Persian Gulf) |
| Gulf of Mexico |
| Gulf of Oman |
| Gulf of Riga |
| Gulf of St. Lawrence |
| Gulf of Suez |
| Gulf of Thailand |
| Gulf of Tomini |
| Gulland and Holt plot |
| gully |
| Gulpers |
| Gunnels |
| gurry |
| gustatory |
| gut |
| gut loop |
| gutted fish |
| guyot |
| gynogenesis |
| Gyodan |
| Gyomiso |
| gyre |
