Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 451 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.
Western roeboides (scale-eating characin)
Roeboides occidentalis
Roeboides occidentalis is a wild characin from the Pacific-slope rivers of Panama down through Colombia into northern Ecuador, topping out around 13 cm (about 5 inches). The really interesting (and kinda spicy) thing about Roeboides as a group is the scale-eating tendency, so its tankmate choices need to be made with that in mind.
Whale catfish
Rita rita
Rita rita is a big, predatory river catfish from South Asia that spends most of its time cruising the bottom and waiting to ambush food. Juveniles can look kind of "cute and manageable" in the shop, but this fish is basically a tank-buster that will eventually want serious space and will absolutely snack on anything it can fit in its mouth.
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-cheeked goby
Rhinogobius duospilus
This is one of those little stream gobies that acts like it's glued to the rocks-its pelvic fins form a suction-cup so it can hang out in flow. Males can color up really nicely and they'll claim a favorite cave/stone like a tiny bouncer, but in a well-structured tank they're super fun to watch cruise the bottom and perch.
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.
Wuchang false sand loach
Parabotia banarescui
Parabotia banarescui is a Chinese botiid loach that stays low, cruises the bottom, and will wedge itself into rockwork like it was built for it. It is the sort of fish that acts shy at first, then turns into a busy, social little bulldozer once it feels secure and you keep it with its own kind.
Xenochromis hecqui (often listed without a stable aquarium common name; avoid confusing with Hecq's shell-dweller)
Xenochromis hecqui
Xenochromis hecqui is a Lake Tanganyika cichlid associated with deep-water habitats (reported captures to ~100 m). It is a specialized scale-eater (historically placed in Perissodus as P. hecqui).