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
Tom Coon's orestias
Orestias tomcooni
Orestias tomcooni is a little high-altitude killifish from the Lake Titicaca basin, built for chilly, oxygen-rich water. It is one of those super-niche Andean natives you almost never see in the trade, and the big "gotcha" is that it wants cool temps long-term, not a standard tropical setup.
Tombigbee darter
Etheostoma lachneri
This is a tiny Gulf Coastal Plain darter from the Tombigbee drainage, and the males get seriously wild in breeding colors - green/turquoise with orange and blue patterning. In the wild they hang around that stream transition zone from pools into riffles, sticking close to the bottom around sand-gravel, rubble, and snag cover. Think of it as a little bottom-perching insect-hunter that really wants clean, well-oxygenated flowing water.
Tonguetied minnow
Exoglossum laurae
Exoglossum laurae (tonguetied minnow) is a freshwater leuciscid minnow of cool, clean, rocky streams in parts of the eastern United States. It has a distinctive ventral mouth adapted for benthic feeding, and it is associated with pebble/rock nest spawning behavior documented for Exoglossum in scientific literature.
Transvestite cichlid
Nanochromis transvestitus
This is a tiny Congo dwarf cichlid where the female is the flashy one - she gets the intense red-violet colors while the male stays more low-key, which is the total opposite of what most people expect. They are cave-spawners and do best in soft, acidic, tannin-stained water, so a little blackwater setup with sand, leaf litter, and lots of hiding spots really suits them.
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.