Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 285 species
Water hyacinth pencil catfish
Ituglanis eichhorniarum
Ituglanis eichorniarum is a tiny, secretive trichomycterid (pencil catfish) from the Paraguay-Parana system, the kind of fish that spends its time nosing through plants and leaf litter instead of cruising the open water. The species name comes from Eichhornia (water hyacinth), which is a fun clue to the sort of weedy habitat it was found in.
Wave Striped Oto
Otocinclus caxarari
Otocinclus caxarari is a very small Loricariid catfish from South America, recorded from the upper Madeira River basin (including the Guaporé area). In aquaria it is typically kept like other Otocinclus species: in mature, well-oxygenated tanks with abundant biofilm/algae and supplemental foods.
Whiptail catfish
Rineloricaria henselii
Rineloricaria henselii is a small loricariid (whiptail) catfish from southern Brazil (reported from the Cubatão River, Santa Catarina) reaching about 7.5 cm standard length.
Whiptail catfish (Twig catfish)
Farlowella acus
Farlowella acus is that classic twig-looking whiptail that can sit on wood and basically disappear - it really does look like a little stick with fins. It is super chill and spends most of its time grazing and picking at surfaces, so it does best in a mature tank with stable water and plenty of stuff to cling to.
White Cloud Mountain Minnow
Tanichthys albonubes
White Clouds are tiny little stream minnows with that neat glowing stripe and red-tipped fins, and they look way better the cooler you keep them. They're super active in a group and do this constant "busy schooling" thing in the top/middle of the tank-really fun fish when you give them space to zip around.
White-Edged (Albimarginata) Betta
Betta albimarginata
This is one of those wild bettas that feels more like a tiny aquarium predator than a "fancy fin" betta-sleek, quick, and always watching what's going on. The males are awesome with that crisp white edging on the fins, and the coolest part is the dad carries the eggs in his mouth, so you'll sometimes see him just chilling and not eating for a bit while he incubates.
Williaminae glass fish
Parachela williaminae
Parachela williaminae is one of those sleek, silvery river "glass fish" types from the Mekong/Chao Phraya systems - built for current and open-water cruising. It is not a tiny rasbora-style fish at all (it can hit around 12 cm/4.7 in), so think "active river minnow" and plan space and flow accordingly.
Xingyun Lake Yunnan loach
Yunnanilus analis
Yunnanilus analis is a little bottom-hugging stone loach from China, originally described from Xingyun Lake in Yunnan. Its species name is literally about the anal fin - it has six branched anal-fin rays, which is a weirdly specific ID feature. This one is not an aquarium regular, so if you ever actually see true Y. analis for sale, it would be a pretty unusual find.
Xiuren torrent catfish
Xiurenbagrus xiurenensis
This is a tiny little Chinese torrent catfish from the Pearl River drainage - think bottom-hugging, hidey fish that wants clean, oxygen-rich water. It stays around 10 cm/4 inches and is more of a nighttime rock-and-crevice cruiser than a "front glass" pet. If you set it up like a cool, fast stream with lots of cover, it should act way more confident.
Xixi high-plateau loach
Triplophysa xiqiensis
Triplophysa xiqiensis is a little Chinese stone loach from cool, flowing hill-stream type water, and it lives right on the bottom picking around the substrate. It is the kind of fish that spends its day cruising and perching on rocks, so it is way more about behavior and habitat vibes than flashy color.
Yaluwak armored catfish
Yaluwak primus
This is a super rare, fast-water loricariid from the upper Ireng River system in Guyana - the kind of fish most hobbyists will only ever see in a scientific paper. Its neat party trick (for an armored catfish) is a big cluster of evertible cheek odontodes and it even lacks a normal adipose fin, replacing it with a low ridge of plates.
Yangi loach
Yunnanilus yangi
Yunnanilus yangi is a small freshwater stone loach (Nemacheilidae) described in 2024 from Yunnan, China (upper Pearl River/Nanpanjiang drainage). Species-specific aquarium guidance is limited in the literature; husbandry is typically inferred from related small Yunnanilus/Micronemacheilus-type loaches, emphasizing clean, well-oxygenated water, cover, and small foods.