Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 541 species
Anitápolis livebearer
Jenynsia weitzmani
Jenynsia weitzmani is a freshwater anablepid livebearer endemic to southern Brazil (currently known only from the type locality near Anitápolis, Santa Catarina). Like other Jenynsia (onesided livebearers), reproduction involves lateralized mating morphology/behavior; aquarium care guidance is not well-documented for this species specifically.
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.
Aracu-comum
Schizodon vittatus
Schizodon vittatus is a large South American anostomid (family Anostomidae). Reported maximum size is about 35 cm standard length; it is harvested/consumed in parts of Brazil and is not commonly covered by mainstream aquarium husbandry references.
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.
Arrowhead puffer
Pao suvattii
Pao suvattii is that sneaky Mekong puffer that likes to sit low and ambush food, and it has that super recognizable arrow/V pattern on its back. Gorgeous fish with tons of personality, but it is absolutely not a community guy - plan on a solo, species-only setup if you want everybody to stay in one piece.
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.