Fish That Start With G
Browse all aquarium fish species with common names beginning with "G". Each profile includes care requirements, water parameters, tank size recommendations, and compatibility information for freshwater, marine, and brackish species.
The letter 'G' features a diverse array of aquarium species ideal for various setups. Notable examples include the vibrant Royal Gramma (Gramma loreto), perfect for reef tanks, and the striking Violet Goby (Gobioides broussonnetii), known for its unique appearance. Whether you're into community fish like the Black Skirt Tetra (Gymnocorymbus ternetzi) or unique specimens, this index provides a great selection for all aquarium enthusiasts.
Galapagos snake eel
Quassiremus evionthas
Quassiremus evionthas (Galapagos snake eel) is a marine snake eel (family Ophichthidae) from the eastern Pacific that inhabits areas with sand/gravel/rubble around reefs and is often associated with sandy substrates.
Ganhe Yunnan loach
Yunnanilus ganheensis
This is a tiny little stone loach from a single area in Yunnan, China (Ganhe, Xundian County). Its description mentions a neat pattern of square-ish dark spots along the sides, and like most small nemacheilid loaches it is basically a bottom-hugging, cover-loving micro-predator that will spend its time picking around the substrate and crevices.
Gardner's killifish
Fundulopanchax gardneri
Gardneri are those little West African killies that look like someone painted neon speckles and flag-fins onto a 2-inch fish. The males will posture and flare at each other but its more drama than damage, and they will absolutely reward you with constant spawning if you give them mops or fine plants. Biggest things to know: keep a tight lid (they jump) and do not cook them warm - they do best in the low-to-mid 20s C.
Ghost flathead
Hoplichthys langsdorfii
Hoplichthys langsdorfii is a little bottom-dwelling ghost flathead from the northwest Pacific (southern Japan down toward the East China Sea). It is a demersal marine predator that hangs on or in the substrate, doing that classic flathead thing of lying still and waiting for food to wander close.
Giraffe catfish
Auchenoglanis occidentalis
This is the classic giraffe catfish - a big, chill African bottom-cruiser with that cool giraffe-like blotchy pattern. It spends a lot of time nosing around the substrate for food and gets way too large for most "monster fish" setups people try to cram it into. If you can actually give it the tank footprint and filtration it deserves, its a super fun, laid-back giant.
Girard's labeobarbus
Labeobarbus girardi
Labeobarbus girardi is a medium-sized African river barb from Angola that tops out around 30 cm. Its natural home is the Lucalla River in the Cuanza (Kwanza) basin, so think oxygen-rich flowing water and lots of swimming room - its biggest issue in aquariums is that it simply gets too large and too active for most typical setups.
Gjellerup's snake eel
Yirrkala gjellerupi
This is a tiny little freshwater snake eel (worm eel family) that lives a pretty un-eel-like life, turning up in streams well away from the sea. It is one of those obscure oddballs you will mostly see in scientific papers rather than aquarium shops, and that rarity is honestly part of what makes it so interesting.
Gladiator dragonfish
Leptostomias gladiator
This is a deep-sea barbeled dragonfish - long, jet-dark, and built like a little ambush predator with a huge toothy mouth. It lives way down in the bathypelagic zone and uses a chin barbel as a lure, so its whole vibe is "lights-out hunter" rather than anything you'd ever keep in an aquarium.
Glass blue-eye
Kiunga ballochi
This is a tiny little PNG blue-eye with a mostly see-through body and subtle yellow-and-black fin markings that look really slick when a group is sparring and flashing. In the wild its range is extremely small (Upper Fly River system near Kiunga/Tabubil), so its basically a conservation fish as much as an aquarium fish. If you ever run into them, think calm, planted, clean-water setup and a decent-sized group so they feel secure.
Glass catfish
Kryptopterus vitreolus
This is the truly transparent "glass" catfish from Thailand - you can literally see the spine and organs when its happy and settled in. The big trick is keeping them in a proper group and giving them calmer, dimmer conditions; once they feel secure, they cruise around together and look unreal in the water column.
Glow Light Tetra
Hemigrammus erythrozonus
The Glowlight Tetra (Hemigrammus erythrozonus) is a small, peaceful South American schooling tetra with a translucent silvery body and a distinctive iridescent orange-red stripe running from the snout to the base of the tail.
Glowlight rasbora
Trigonostigma hengeli
This is the little "orange neon line + tiny black wedge" rasbora that absolutely glows when you keep it over a dark substrate with plants and a bit of tannin-stained water. The best part is how tight they school-get a decent group and they move like one fish, super calming to watch.
Goeldi's hemiodus
Hemiodus goeldii
Hemiodus goeldii is one of those sleek, torpedo-shaped South American schooling characins that really looks best when you keep a proper group and give them lots of open swimming room. They can be a bit stressy and skittish if cramped or kept singly, but in a calm, oxygen-rich setup they turn into constant, graceful motion - and theyre often mixed up with similar Hemiodus species in the trade.
Golani's snakemoray
Uropterygius golanii
This is a small-ish Red Sea snake moray that spends most of its time wedged into rockwork with just a face peeking out. Its plain brown/gray look is super good camouflage, and like a lot of Uropterygius it is more of a secretive ambush predator than an out-in-the-open swimmer.
Golden Julie
Julidochromis ornatus
Julidochromis ornatus is that sleek little Tanganyikan rock-dweller with the gold body and crisp black stripes that just pops against a pile of limestone. Give it a tight maze of caves and it will pick one like its home base, patrol it, and (once paired up) it is a really fun cave spawner to watch. It is small, but it has big "this is my rock" energy - especially around breeding time.
Golden otocinclus
Otocinclus affinis
Otocinclus affinis is a small South American suckermouth catfish prized for grazing soft algae and biofilm on plants, glass, and décor. It has a slender body with a dark lateral stripe and a pale underside, and it is best kept in groups where it feels secure. Although peaceful, it can be delicate when newly imported and does best in mature, well-oxygenated aquariums with plenty of natural growth to graze.
Golden pencilfish
Nannostomus beckfordi
Beckford's pencilfish is that sleek little "stick with fins" that likes to hang in the upper half of the tank at a slight angle and flash a crisp dark stripe. Keep a proper group and you'll see males do these tiny sparring/display moments (no real damage) and the whole school just looks super classy over dark substrate and plants.
Goldfish
Carassius auratus
Goldfish are one of the most popular and recognizable freshwater fish in the aquarium hobby. They are known for their golden-orange coloration, although they can also appear in red, white, yellow, and black. Goldfish are highly adaptable and can thrive in a variety of conditions, making them a favorite among beginners.
Gorgeous prawn-goby
Amblyeleotris wheeleri
Amblyeleotris wheeleri is that classic shrimp-goby that picks a sandy spot, makes a burrow, and basically turns your tank into a little nature documentary if you pair it with a pistol shrimp. It hangs at the burrow entrance, does the whole lookout routine, and flashes those red bands and blue speckling when it is settled in.
Gracile rivulus (Kryptolebias)
Kryptolebias gracilis
Kryptolebias gracilis is a very small Brazilian rivulid killifish from the Saquarema Lagoon basin (Rio de Janeiro State). It occurs in creeks and swamps in open vegetation, often in very shallow water (~5–10 cm), in both clear and tea-coloured water, and feeds mainly on small crustaceans (e.g., ostracods) and terrestrial arthropods.
Gray rockfish
Sebastes glaucus
Sebastes glaucus is a cold-water gray-to-dark rockfish from the northwest Pacific that hangs out deep and close to the bottom. Like other rockfishes it is livebearing (viviparous), and it is the kind of fish you mainly see in public aquariums or fisheries talk - not really a home-aquarium species unless you can provide a large, chilled marine setup.
Green Spotted Puffer
Tetraodon nigroviridis
Green spotted puffers are little water puppies with fins-super curious, always watching you, and they'll beg like they've never been fed in their life. The bright green-and-black spotting stays eye-catching, and they've got that classic puffer "I'm plotting something" face. Just know they're not a true freshwater fish long-term, and they really do need crunchy foods to keep their teeth worn down.
Green Swordtail
Xiphophorus hellerii
Swordtails are busy, always-on-the-move livebearers, and the males' "sword" tail extension is the whole show-lots of displaying and posturing in the open water. They're tough as nails in hard, slightly alkaline water, but in tight tanks the males will absolutely bicker and chase each other around.
Green chromide
Etroplus suratensis
This is that big, chunky Indian/Sri Lankan cichlid that looks like it's sprinkled with little "pearl" flecks on each scale once it colors up. It's a brackish-leaning grazer that loves to pick at algae/plant matter and it gets way more interesting in a group-plus the parents do classic cichlid guard-the-eggs-and-fry behavior.