Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 654 species
Goldstriped flying fox
Crossocheilus cobitis
Crossocheilus cobitis is one of those true river fish that spends its day cruising and grazing - algae, periphyton, and whatever micro-stuff it can rasp off hard surfaces. It gets a decent adult size (around 15 cm/6 in) and really appreciates a long, current-y tank with tons of oxygen and clean water. Also, it is a species that can be mixed up in the trade with other similar Crossocheilus, so ID matters.
Goldstripe ponyfish
Karalla daura
Silvery little schooling ponyfish with a bright gold stripe and that classic slipmouth look. They cruise muddy shallows in tight groups and, like other ponyfish, have a cool bacterial light-organ setup for signaling at night. Not a common aquarium fish, but super interesting if you are set up for marine schooling species.
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.
Goulding's lampeye
Fluviphylax gouldingi
This is one of those truly tiny Rio Negro blackwater lampeyes - like, adult size is basically the length of a grain of rice. In the right light you can catch a little orange blotch on the face, and males have a neat filament on the pelvic fin. They do best in a calm, heavily planted (or leaf-litter) setup where micro-food is always available.
Greek lamprey
Caspiomyzon hellenicus
Wild little jawless oddball from cool Greek spring-fed streams. Larvae live buried in sand filtering microscopic food for years, then transform into short-lived, non-feeding adults that spawn and fade out. Super neat biology, but not a practical aquarium fish at all.
Green-peritoneum snailfish
Paraliparis entochloris
Paraliparis entochloris is a deepwater snailfish from the northwest Pacific, and the name is basically calling out its weird party trick: it has a green peritoneum (the lining around the organs) that can show through the body wall. This is not an aquarium fish at all - it is a cold, deep, bottom-associated species that is mostly known from scientific collections rather than the hobby.
Green Uruguay Dwarf Pleco
Hisonotus ringueleti
A tiny, green-tinged sucker cat from the Uruguay River, Hisonotus ringueleti stays truly bite-sized and spends its day grazing leaves and glass. Give it cool, clean, well-oxygenated water and a planted tank with plenty of biofilm and it will cruise around in a group like little leaf-hoppers.
Guaruba moenkhausia (Guaruba tetra)
Moenkhausia guaruba
Moenkhausia guaruba is a newly described Brazilian characin from the upper rio Braco Norte (Tapajos system), and it gets pretty big for a Moenkhausia - think "chunky, fast tetra" vibes. Since its formal description is recent, real aquarium-specific info is still thin, so I'd treat it like a larger, riverine Moenkhausia: keep a proper group, give it current and open swimming room, and expect it to act like a confident midwater schooling fish.
Guaymas goby
Quietula guaymasiae
This small estuarine goby is endemic to Mexico’s Gulf of California and is usually found in shallow lagoons and river mouths over sand or mud. It is a facultative air‑breather and tolerates warm, low‑oxygen conditions. It is not a typical community freshwater or reef fish—treat it as a brackish/estuarine species that prefers calm water and fine substrate.
Gubal goatfish
Upeneus gubal
Upeneus gubal is a small Red Sea goatfish described in 2019 from the southern Gulf of Suez. It cruises sandy/muddy bottoms and uses its chin barbels to locate benthic invertebrate prey. With a reported maximum of 8.7 cm SL, it is smaller than most goatfishes, but still requires a large, long tank and fine sand to accommodate constant foraging behavior.
Guenther's gudgeon
Acanthogobio guentheri
This is a Chinese river gudgeon from the upper Yellow River area, a bottom-hugging little cyprinid that spends a lot of time cruising the substrate. Its vibe is more "stream fish" than "tropical community" - give it good flow, lots of oxygen, and a sand-and-pebble setup and it really shines.
Guinean sole
Synaptura cadenati
Synaptura cadenati is a West African sole that lives right on the bottom over sand and mud, usually in shallow coastal water. It is a flatfish with little white spotting on the eyed side, and it tops out around 35 cm - more of a food-fish than something you will realistically see (or want) in a home aquarium.