Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 560 species
Sunda viviparous brotula
Ungusurculus sundaensis
This is a tiny little reef-dwelling brotula that lives tucked into cracks and crevices in very shallow water. The wild thing about these guys is they are livebearers (viviparous), which is pretty unusual among marine fishes, and they tend to be super cryptic and solitary.
Sundolyra catfish
Sundolyra latebrosa
This is a super obscure little bagrid catfish from northwestern Sumatra, and its whole vibe is "hidden" - the species name latebrosa literally points at how cryptic and rarely seen it is. In the wild it is known from a very limited drainage, and in the hobby it is basically unicorn-level rare, so most "care" advice you see online is going to be educated guesswork rather than proven aquarium experience.
Tachira rubbernose pleco
Chaetostoma tachiraense
This is a small mountain Chaetostoma from the Catatumbo (Lake Maracaibo) drainage, the kind of fish that wants to be plastered to rocks in high-oxygen water. It stays around 3.4 inches SL, spends its time grazing biofilm, and does best when you treat it more like a river fish than a typical warm, lazy pleco.
Talas stone loach
Triplophysa paradoxa
Triplophysa paradoxa is a little bottom-dwelling stone loach from the Talas River basin, built for life hugging the substrate in cooler, well-oxygenated water. In a tank it spends most of its time scooting around the bottom, wedging into crevices, and generally acting like a tiny river-goblin that wants lots of cover and clean water.
Tanaka's possum wrasse
Wetmorella tanakai
This is one of those tiny, sneaky reef wrasses that basically lives in the rockwork and pops out to hunt little micro-bugs all day. The red-orange body with thin white bars and those little "eye spots" on the fins make it a really cool "where did that fish come from?" kind of addition. It is super peaceful, but it does best in a mature reef where it can graze and not get pushed around.
Tanganyika lampeye
Lacustricola pumilus
This is a tiny Lake Tanganyika-area lampeye killifish that hangs in little groups along quiet shorelines and river-mouth shallows. When the light hits right, the males flash a really slick metallic eye and warm orange tones in the fins, and they are constantly out in the open cruising the edges for food.
Taquari banjo catfish
Ernstichthys taquari
This is a tiny little banjo catfish from Brazil that lives right on the bottom and blends in with rocks, sand, and leaf litter. Its known habitat is shaded, vegetated stretches of a small whitewater river with moderate flow and lots of big rocks - very much a hide-and-sit-still kind of fish. In the aquarium hobby its basically a "research fish" right now: super cool, but there is almost no species-specific care data published.
Tchefou cardinalfish
Jaydia tchefouensis
Jaydia tchefouensis is a little marine cardinalfish (Apogonidae) originally described from Chefoo/Tche-Fou (modern Yantai), China. Real talk: this name is kind of messy in the literature and may actually be a junior synonym of Jaydia lineata, so you will almost never see it sold under this exact ID in the aquarium trade. Like other cardinalfish, expect a shy, nocturnal vibe that hangs near structure and picks off small meaty foods.
Thompson's poacher
Freemanichthys thompsoni
Freemanichthys thompsoni is a temperate, demersal marine poacher (family Agonidae) from the northwestern Pacific, reported from roughly 10–300 m depth and reaching about 22 cm total length. Because it is a coldwater/deeper-water species, it is rarely suitable for typical tropical marine aquaria and would require specialized chilled, high-oxygen systems if kept.
Thracian shemaya
Alburnus istanbulensis
Endemic to Turkey, occurring in coastal streams of Thrace (Marmara to SW Black Sea drainages) and Lake Sapanca; a small, silvery pelagic cyprinid (bleak/shemaya type).
Threadfin rainbowfish
Iriatherina werneri
This is the little rainbowfish with the ridiculous, delicate streamers - especially on the males, who love to posture and "dance" at each other in a calm planted tank. Keep them in a real group and they get way braver, cruising the top/midwater under floaters and showing off those thread-like fins. They are peaceful, but they really hate fast flow and rough tankmates that shred fins or outcompete them at feeding time.
Threadfin seasnail
Rhodichthys regina
This is a deep-sea snailfish from the Arctic and far North Atlantic - not an aquarium fish at all, but a really neat oddball from way down in the cold and dark. It lives on or right above the bottom and cruises around picking off crustaceans, and in life it can be bright red which is wild for something from 1000+ meters down.