Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 556 species
Anteridorsal Homatula loach
Homatula anteridorsalis
This is a benthic Chinese stream loach from Yunnan that lives right down on the bottom in clear, flowing water over gravel and rocks. Think of it as a "river tank" fish - it wants current, oxygen, and lots of surfaces to poke around on for bits of food and algae.
Arianae tetra
Hyphessobrycon arianae
Tiny South American tetra from the Parana River basin that tops out around an inch, so a little school looks awesome in a planted nano tank. It is mellow, fast, and active in groups, but you do not see it for sale very often. Keep a decent shoal and it will show more confidence and color.
Armoured stickleback
Indostomus paradoxus
This is that goofy little "freshwater seahorse"-looking fish that just kind of perches and scoots around like a tiny armored twig. Its whole vibe is slow, sneaky micropredator - once its settled in, you will catch it stalking microfoods and doing these subtle little posture displays. The big trick is feeding: they do best when you can provide lots of small live foods in a calm, planted tank.
Arnegard's electric fish
Petrocephalus arnegardi
This is a little Congo River elephantfish (a weakly electric mormyrid) that cruises the lower parts of the tank and navigates the world with its electric sense. It stays small (around 9 cm) and has a clean silvery look with three dark marks that make it pretty easy to pick out among Petrocephalus.
Aroa twig catfish
Farlowella martini
Farlowella martini is one of those unreal-looking stick catfish that just vanishes the moment it parks itself on a branch. It is a super calm, slow-moving grazer that does best in a mature tank with lots of biofilm, gentle flow, and clean, oxygen-rich water - they are not great at competing at feeding time, so you kind of have to look out for them.
Arraya's bluntnose knifefish
Brachyhypopomus arrayae
This is a weakly-electric South American knifefish that cruises around plants and root mats and does most of its business after lights-out. It is a pretty subtle-looking fish (more earthy browns than flashy colors), but the cool part is the whole electric-sense lifestyle and that smooth, hovering knifefish swim.
Austellus barb
Dawkinsia austellus
Dawkinsia austellus is a freshwater cyprinid endemic to southern India (Western Ghats region). It is an active, shoaling barb best maintained in a group in a spacious, well-filtered aquarium with good oxygenation and regular maintenance.
Avacanoeiro whiptail catfish
Lamontichthys avacanoeiro
This is one of those rarer Lamontichthys whiptails from Brazil that looks like it was built for fast water - long, armored, and made to hug the bottom in current. In the wild its from the upper Rio Tocantins basin, and in a tank it will really appreciate super clean, oxygen-rich water and lots of smooth surfaces to graze.
Bailian cave loach
Micronemacheilus bailianensis
A small freshwater nemacheilid (stone loach) described from Bailian Cave near Liuzhou City, Guangxi, China; maximum recorded size about 4 cm SL. Troglobitic/cave-associated species with limited natural distribution.
Bajiang Yunnan loach
Yunnanilus bajiangensis
This is a tiny Chinese stone loach from Yunnan that lives down on the bottom and stays pretty small (around 6.5 cm max). Honestly, its "cool factor" is more about being a super-local river fish than being a flashy aquarium species - and because it is listed as Critically Endangered, its conservation status is the big headline here.
Banded Batasio
Batasio fasciolatus
This is a small hillstream bagrid catfish from the Tista drainage up in the Brahmaputra system. It spends a lot of time tucked under rocks and comes alive more at dusk and at night, so the more caves and crevices you give it, the more you will actually see it. The vertical banding is super sharp in good condition, and they really appreciate cool, oxygen-rich flow.
Banded dwarf three-barbel catfish
Nannoglanis fasciatus
This is a tiny little Ecuadorian heptapterid catfish with bold banding - a real under-the-radar oddball that almost never shows up in shops. Since there is basically no solid aquarium-care literature for it, I would treat it like a small, shy, bottom-hugging Amazon/upper Amazon tributary catfish: lots of cover, gentle flow, and clean, well-oxygenated water.