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
Anhanga pygmy pencil catfish
Potamoglanis anhanga
This is a truly tiny Amazonian trichomycterid catfish - like 1.3 cm max - so it is more of a micro-predator oddball than a typical community catfish. It is the kind of fish that disappears into sand, leaf litter, and plant roots, and you will spend way more time setting up the right micro-habitat than you will actually seeing it.
Annandale's zebra sole
Zebrias annandalei
Zebrias annandalei is a small demersal sole from coastal India that inhabits sandy or muddy bottoms and buries for camouflage. It is rarely kept in home aquaria and would require a specialized marine sand-bottom setup and appropriate feeding.
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.
Baikal white grayling
Thymallus brevipinnis
Think of a trout-shaped fish with a huge sail-like dorsal fin that really pops on the males. It comes from Lake Baikal and wants icy, roaring, ultra-clear water with a ton of oxygen, so it is more of a public-aquarium fish than a home tank resident. It shoals and snaps up drifting insects, but will also take small crustaceans, fish eggs, and the odd tiny fish.
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.