Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 289 species
Hexi stone loach
Triplophysa hexiensis
This one is a little taxonomic curveball: Triplophysa rossoperegrinatorum (Prokofiev, 2001) is treated as a synonym of Triplophysa hexiensis in major references, so in the hobby you will basically want to think of it as T. hexiensis. Its a bottom-dwelling river loach from northern China that likes clean, well-oxygenated water and spends a lot of time hugging the substrate and darting between rocks.
Hi-fin headstander barb
Oreichthys cosuatis
Oreichthys cosuatis is a tiny Indian/Bangladeshi barb where the males can throw up a really cool tall dorsal fin and some nice red/yellow accents when they settle in. They spend a lot of time cruising midwater and picking around for food, and they do best when you keep them in a proper little group so they feel bold.
Highland swordtail
Xiphophorus malinche
Xiphophorus malinche is a smaller, cooler-water swordtail from fast, clear rivers in Mexico, and the males can show a really neat golden-brown look with blue/purple sheen plus a short yellow sword. It is a livebearer, but it is not the "toss it in a warm community tank" kind of swordtail - it does best kept cool with very clean, oxygen-rich water.
Honey gourami
Trichogaster chuna
Honey gouramis are those little chill labyrinth fish that spend a lot of time cruising the upper half of the tank and "feeling" around with their long thread-like belly fins. Give them plants (especially floaters) and calm tankmates and they really settle in-males can glow that warm honey/orange color and will build bubble nests at the surface.
Hovering Zebra Loach
Yunnanilus cruciatus
This tiny Vietnamese stone loach is a little weirdo in the best way - it often cruises head-down at about a 45-degree angle and will "hover" in the water column while it hunts for snacks. Keep it in a proper group and a planted, mature tank, and you get constant small-fish activity without the drama.
Howes' prodontocharax
Prodontocharax howesi
This is a tiny Amazon-basin cheirodontine characin associated with unusual jaw/tooth morphology in the Prodontocharax/Amblystilbe group. Recent revisionary work revalidated the genus Amblystilbe and treats Amblystilbe howesi as distinct; older secondary sources may list the fish under Prodontocharax howesi, so identification and naming can be inconsistent in non-specialist contexts.
Htamanthi danio
Danio htamanthinus
This is a truly tiny Myanmar danio from little streams around Htamanthi in the Chindwin River basin. It stays under an inch, so it feels more like keeping a bunch of shimmering micro-fish than a typical zebra-danio-style "speedster". Give it plants, calm tankmates, and a group big enough that it feels secure and you will see much nicer, bolder behavior.
Huangwei gu (黄尾鲴)
Xenocypris davidi
Xenocypris davidi is a Chinese river fish that gets way bigger than most folks expect from a "minnow-looking" cyprinid - it's a sleek, open-water swimmer that can hit real dinner-plate size. In the wild it's a benthopelagic species and even shows up in slightly brackish areas, so it's pretty adaptable, but it's not really an everyday home-aquarium fish because of its adult size and need for swimming room.
Hubei sharpbelly
Xenocypris hupeinensis
Xenocypris hupeinensis is a freshwater sharpbelly (family Xenocyprididae) endemic to China, reported from the middle and upper reaches of the Changjiang (Yangtze) River system, with a maximum recorded length of about 25.6 cm TL. Aquarium husbandry information appears scarce in mainstream hobby references; any care guidance should be treated as extrapolation from similar open-water cypriniform fishes rather than species-specific data.
Hyrtl's catfish
Neosilurus hyrtlii
This is an Aussie eel-tail catfish that looks like a sleek little catfish-meets-eel, especially when it flashes those yellow fins. It spends a lot of time cruising the bottom and hoovering up meaty bits, and it can get way bigger than people expect if you keep it well fed and give it swimming room.
Iberian arch-mouthed nase
Iberochondrostoma lemmingii
This is a temperate Iberian river leuciscid that typically inhabits middle-to-lower river reaches with weak to moderate current and abundant aquatic vegetation. It feeds largely on algae/detritus and also zooplankton and small aquatic invertebrates. It is a native conservation-interest species in parts of its range and is not commonly encountered in the aquarium trade.
Imparfinis catfish
Imparfinis piperatus
Imparfinis piperatus is a tiny Brazilian heptapterid catfish that spends its time down on the bottom, scooting around like a little stream goblin. It stays really small (around 3.2 cm SL max), and the neat part is the subtle mottled/striped look and those long barbels that make it look way more "catfish" than its size suggests. Not super common in the aquarium trade, but it is a cool pick if you are into South American stream setups.