Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 419 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.
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.
Tang's snapper
Lipocheilus carnolabrum
This is a deepwater snapper with a really distinctive "lumpy" fleshy upper lip - once you know that look, you spot it right away. It lives way down on rocky shelf bottoms and is more of a food-fish than an aquarium fish, mostly because it gets big and comes from colder, deeper water than a typical reef tank setup.
Tasmanian ruffe
Tubbia tasmanica
Tubbia tasmanica (Tasmanian ruffe / Tasmanian rudderfish) is a deepwater marine medusafish (Centrolophidae) from temperate Southern Hemisphere waters (Tasmania, New Zealand, and reported off Natal, South Africa), recorded to about 850 m depth and reaching about 67 cm TL; it is not an aquarium-trade species.
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.
Tentacled scorpionfish
Pontinus tentacularis
Pontinus tentacularis is a deepwater scorpionfish with those wild little tentacles over the eyes that help it break up its outline. It is a bottom-dwelling ambush predator from 170-600 m, so its needs are way more like a cold, dim, pressure-adapted fish than anything meant for a typical home marine tank.
Theodore's threadfin bream
Nemipterus theodorei
Nemipterus theodorei is a saltwater threadfin bream from eastern Australia with that pinkish-mauve body, clean little yellow-green striping, and a red spot on the side. Its a sand-and-mud bottom cruiser from deeper coastal water, so its really more of a wild marine/fishery species than something youd realistically keep in a home aquarium.
Thin sand-eel
Yirrkala tenuis
Yirrkala tenuis is a skinny little snake eel that spends a lot of its time tucked into sand or soft bottom, with just the head poking out when it feels like it. It is a Western Indian Ocean species (Red Sea area down to South Africa, plus islands like Mauritius and Reunion), and it can get surprisingly long for how "thin" it looks - over 50 cm.
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.
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.
Three-spot righteye flounder
Samariscus triocellatus
This is a tiny little Indo-Pacific flounder that lives right on sand and rubble around reefs, and it can be ridiculously hard to spot once it settles in. The coolest part is the three eye-like spots (ocelli) and the way it kind of creeps along the bottom hunting small benthic critters at dusk.
Tidepool snailfish
Liparis florae
This is a little coldwater snailfish that literally lives in tide pools on exposed Pacific coast rock, hiding under algae and stones when the surf is crashing. It has that classic soft, tadpole-ish snailfish look and a suction-disk belly, so it can cling in place instead of getting tossed around. Super cool fish biologically, but it is absolutely not a normal home-aquarium species unless youre set up for a chilled marine system.