Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 289 species
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 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.
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.
Gunther's baril
Opsarius radiolatus
Opsarius radiolatus is a fast, stream-type danio relative that really wants room to cruise - think clear, gravelly water and a lot of current. If you keep a small group in a long tank with good flow, they settle in and you get that constant, zippy midwater action that makes river tanks feel alive.
Guppy
Poecilia reticulata
The Guppy is one of the most popular freshwater fish among aquarium enthusiasts due to its colorful appearance and lively nature. These fish have a wide range of vibrant colors and tail shapes, making them a visual delight in any aquarium. Guppies are known for their peaceful temperament and ease of care, making them ideal for both beginner and experienced fishkeepers.
Half-banded kuhli loach
Pangio semicincta
Pangio semicincta is one of those classic "striped kuhli" loaches that spends the day wedged in plants and caves, then comes out at lights-down to wiggle around like a tiny eel. They're super social once you keep a proper group, and they're famous for piling into the same hidey-hole together. Also: they're one of the species that gets mixed up/mislabeled in the trade a lot, so buying from a shop that IDs them carefully is a win.
Harelip sucker
Moxostoma lacerum
Moxostoma lacerum (the harelip sucker, also called the hairlip redhorse) was a temperate North American sucker with a really odd split lower lip and a specialized bottom-feeding setup. Sadly its whole story is basically a cautionary tale - it was sensitive to silt and habitat changes, and it is now listed as Extinct (IUCN assessed August 4, 2012).
Harlequin Rasbora
Trigonostigma heteromorpha
Harlequin rasboras are those little coppery-orange fish with the bold black "wedge" on their sides that somehow look even better once they're cruising in a group. Give them a nice school and some plants to weave through and they'll do this tight, synchronized swimming thing that's honestly kind of hypnotic.
Hartt's banjo catfish
Bunocephalus hartti
Bunocephalus hartti is a tiny little banjo catfish from the Sao Francisco basin in Brazil that lives its best life looking like a dead leaf and pretending it does not exist. Give it sand and leaf litter and it will vanish for days, then suddenly pop out at night like a little cryptid vacuuming up food off the bottom.
Head-and-Tail Light Tetra
Hemigrammus ocellifer
This little tetra does a neat trick in the light-there's a shiny "headlight" spot near the gills and a glowing "taillight" at the base of the tail, so the whole school kind of sparkles as they turn. They're super chill in a group, and they look way better the bigger the shoal is and the more plants you give them to cruise through.