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
Three-spined stickleback
Gasterosteus aculeatus
The three-spined stickleback is a small, armored fish with bony lateral plates and three prominent dorsal spines used for defense. Males become striking in breeding condition, often developing a red throat/belly and intensified coloration while they build and guard nests. It is highly active and behaviorally interesting, but can be nippy and territorial, especially during breeding.
Tibetan garra
Garra tibetana
A rugged little hill-stream grazer from the cold, fast water of Tibet's Yarlung Tsangpo. It uses a sucker-like mouth to cling to rocks and rasp biofilm, and it really shines in a high-oxygen, high-flow setup. Think cool temps, clean water, and lots of hard surfaces to pick at.
Tigerfish
Rhamphochromis longiceps
This is one of Lake Malawi's sleek, open-water predator haps - long, torpedo-shaped, and built to chase down smaller fish. Adults can get a cool greenish metallic sheen on the back and mature males may look more bluish-grey, plus the females are classic mouthbrooders.
Timid lamprologine cichlid
Neolamprologus timidus
This is a Lake Tanganyika rock-cave cichlid that acts exactly like its name - it tends to be shy and hangs in hard-to-reach caves, often even sitting upside down under overhangs. It tops out around 10 cm and is more of a "pair with a cave" fish than a busy open-water swimmer, so the whole setup is about rocks, shadows, and stable Tanganyika water.
Tippecanoe darter
Etheostoma tippecanoe
Teeny little riffle goblins that perch on the gravel and then rocket up to grab passing bugs. Males get a cool orange throat and fin edges in breeding season, and they spawn by burying eggs in clean pea-sized gravel. Awesome fish to watch, but they need cool, super-clean, fast-moving water to thrive.
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.
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.
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.
Torrent catfish
Glyptothorax interspinalum
Think of this as a little river cat that grips rocks with a ribbed chest pad so it can sit right in the rapids. It stays around 10 cm and comes from fast, cool streams in Laos, Vietnam, and southern China, so it shines in a high-flow, high-oxygen tank with smooth stones and meaty foods. ([fishbase.se](https://www.fishbase.se/summary/Glyptothorax-interspinalum))
Torrent catfish
Glyptothorax chimtuipuiensis
A tiny hillstream cat that hugs rock faces with a grippy chest pad, G. chimtuipuiensis comes from fast, cool riffles in Mizoram. Set it up in strong flow with tons of oxygen and it will spend its time scooting from stone to stone like a little river ninja.
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.
Tufa darter
Etheostoma lugoi
Tiny darter from Mexico's Cuatro Cienegas springs that hugs the bottom over pale tufa rubble. Males get a neat blue throat in breeding dress and you will catch them scooting between the grooves of the stromatolites like little gobies. Gorgeous fish, but super specialized and protected in the wild.