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
Tuivai stone loach
Mustura tuivaiensis
Mustura tuivaiensis is a tiny little brook/stone loach from the Tuivai River in Manipur, India - a bottom-hugging stream fish that spends its time nosing around the substrate. It is one of those "real" river loaches that really appreciates clean, oxygen-rich water and lots of cover (rocks, pebbles, leaf litter) so it can scoot from hideout to hideout.
Tumba tetra
Alestopetersius tumbensis
This is one of those lesser-seen Congo Basin African tetras, a small, silvery shoaler that really comes alive when you keep it in a proper group. It is from the Lake Tumba/Malebo Pool area, and like a lot of alestids it is an active midwater swimmer that appreciates space and clean, well-oxygenated water.
Tussy's small red fighter
Betta tussyae
Betta tussyae is a tiny little blackwater betta from peat swamp forests in Pahang, Malaysia, and it stays small enough that you can really do it justice in a compact, heavily planted tank. It likes soft, very acidic water and a calm setup with lots of leaf litter and cover, and it will absolutely use the labyrinth organ to gulp air like other bettas.
Tuticorin goby
Yongeichthys tuticorinensis
This is a little demersal tropical goby from India that basically lives life down on the bottom. Its also one of those super-obscure species that shows up in fish databases but almost never in the aquarium trade, so most hobby care info you see for it will really be educated guesswork based on similar gobies.
Twig catfish
Farlowella knerii
A true twig impersonator from the Ecuador-Peru headwaters, Farlowella knerii spends its days clinging to wood and plant stems while grazing on biofilm. Peaceful and shy, it looks like a stick with fins, and males will even guard neat rows of eggs on glass or driftwood if conditions are right.
Twosaddle Corydoras
Corydoras weitzmani
Weitzman's cory is one of those super sleek Corydoras that looks like it's wearing a little mask-clean lines, subtle patterning, and that classic cory "busy little vacuum" vibe. The best part is watching a whole group cruise the bottom together, then suddenly zip to the surface for a gulp of air like tiny torpedoes.
Uaru (Triangle cichlid)
Uaru amphiacanthoides
Uaru are big, mellow Amazon cichlids with that neat disc-and-triangle body shape and a surprisingly "gentle giant" vibe. They graze and pick at food all day, act super social when kept in a group, and they are famous for serious parent duty when they breed (both parents guard and tend the young).
Ubirajara rivulus (killifish)
Melanorivulus ubirajarai
This is a tiny Cerrado rivulus from central Brazil - the males show off neat red chevron-like markings, and they are always cruising the top and edges looking for snacks. Like a lot of Melanorivulus, it is a jumpy little personality fish that does best in a tight-lidded, plant-heavy setup with gentle flow.
Upside-down Catfish
Synodontis nigriventris
The upside-down catfish is a small African mochokid catfish famous for swimming and feeding belly-up, especially under cover and along the water's surface. It has a light belly (often with darker spotting), a darker back, and prominent barbels, and it is most active at dusk and night. Peaceful overall, it does best in groups with plenty of hiding places like driftwood and caves.
Urosema dwarf pike cichlid
Wallaciia urosema (S. O. Kullander, 1990)
Rheophilic (current-loving) dwarf pike cichlid from Brazil’s Tapajós system; a small, territorial predator (to ~6.8 cm SL) that benefits from strong filtration/oxygenation, broken sightlines, and plenty of bottom cover (wood/rocks/caves).
Validus barb
Enteromius validus
Enteromius validus is a little Congo Basin barb that stays under 4 inches, with a chunky, sturdy body and proper barbels. Its wild diet is basically "whatever shows up" (insects, plant bits, seeds), so it is built for picking and browsing all day. This one is pretty obscure in the aquarium hobby, so most people keeping it are kind of blazing their own trail.
Vanmanenia gymnetrus (hillstream loach)
Vanmanenia gymnetrus
This is one of those true hillstream loaches built to live plastered onto rocks in fast current. It spends its time scooting around surfaces and grazing biofilm, and it really comes alive in a high-oxygen "river tank" setup. Not a "warm, still community tank" fish - it wants flow and clean water to look its best.