Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 528 species
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.
Tiger watchman goby
Valenciennea wardii
This is one of those classic sand-sifting sleeper gobies that will stay busy all day taking mouthfuls of sand, picking out tiny foods, and spitting the clean sand back out. Super chill temperament, but it really wants a mature tank with a real sandbed so it can do its thing without slowly starving. Also heads-up: they can redecorate by burying frags and making little bulldozer trenches.
Toothed leftvent
Linophryne macrodon
This is a deep-sea anglerfish in the leftvent family, the kind of fish that lives way down in the dark and uses a little glowing lure to bring food right to its mouth. Females get a lot bigger than males (the males are tiny), and the whole vibe is pure deep-ocean weird in the best way.
Tosa stargazer
Uranoscopus tosae
Uranoscopus tosae is a stargazer that lives out on deeper sandy-muddy bottoms and does the classic stargazer thing - buries itself and waits to ambush prey. It is a venomous, bottom-sitting predator from the western Pacific, and it is really more of an ocean fishery/bycatch species than anything you would realistically keep in a home aquarium.
Toyama sculpin
Icelus toyamensis
This is a deepwater Japanese sculpin that lives down on the bottom, not a typical home-aquarium fish. It tops out around 13 cm and comes from cold, marine bathydemersal habitat, so it is really more of a public-aquarium or specialist coldwater setup animal than something for a normal reef or tropical tank.
Tubeshoulder
Mentodus mesalirus
Mentodus mesalirus is a deep-sea tubeshoulder - one of those wild ocean fish that can squirt a bioluminescent fluid from a special tube organ near the shoulder. It is not an aquarium species at all, but it is seriously cool from a biology standpoint because that light-producing setup is basically its whole claim to fame.