Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 337 species
Inle loach
Yunnanilus brevis
This is the quirky little Inle loach from Myanmar (Lake Inle/He-Ho plain) that cruises around midwater in a loose shoal and often swims head-up (normal behavior). Unlike many loaches, it does well in calmer, well-planted setups with good water quality, and it’s best kept in groups to encourage natural schooling.
Iskenderun bleak
Alburnus kotschyi
Alburnus kotschyi is a freshwater bleak endemic to southern Turkey, known from the Seyhan and Ceyhan river drainages and coastal streams between Ceyhan and Arsuz (İskenderun Bay watershed). It is not a standard aquarium-trade species.
Italian spring goby
Knipowitschia punctatissima
This is a tiny little freshwater goby from northern Italy that spends most of its time glued to the bottom, scooting between sand, gravel, and cover. In the wild it is tied to cool, clear spring-fed habitats, so it does best in an oxygen-rich tank with gentle flow and lots of little hiding spots. Its size is cute, but its needs are kind of specific, and its wild status makes it a fish I would not treat as a casual impulse buy.
Jadova minnow
Delminichthys jadovensis
This is a tiny karst-stream minnow that lives in just a sliver of Croatia, and it actually ducks into subterranean waters (or hides in mud) when conditions get rough. Its whole life is tied to super clear, slow-flowing streams, so it is more of a conservation fish than something you will realistically see for sale.
Jaguar livebearer
Jenynsia onca
Jenynsia onca is an unusual anablepid livebearer often called a one-sided livebearer; males have an asymmetrical gonopodium and mating may involve lateralized positioning (though some sources dispute strict left/right-only pairing). In aquaria they are active schooling fish that prefer cooler, well-oxygenated water and are best kept in groups.
Jalisco chub
Yuriria alta
Yuriria alta is a Mexican freshwater chub endemic to central Mexican basins (including the Lerma–Chapala region) reaching about 18.2 cm SL. The species is listed as Endangered (IUCN), so collection/keeping may be restricted and it is more often of conservation/biotope interest than a mainstream aquarium fish.
Jingxi Yunnan loach
Yunnanilus jinxiensis
This is a small Chinese stone loach from Guangxi, and its whole vibe is "hang out on the bottom and poke around". It comes from a pretty specific local area (Jingxi County), so you are not likely to see it in the regular aquarium trade. If you do run into one, think cool, clean, well-oxygenated water and lots of hiding spots like you would for other little nemacheilid loaches.
Jupiaba apenima
Jupiaba apenima
A tiny stream-loving tetra out of the upper Tapajos basin in Brazil, Jupiaba apenima is an active little shoaler that loves clean, moving water. It even has a neat forward-pointing pelvic spine, and there are Moenkhausia that mimic its look in the wild. Give it a soft, slightly acidic, well-oxygenated setup and a good-sized group and it will stay busy all day.
Jupiaba tetra
Jupiaba pinnata
Jupiaba pinnata is a small South American characin from the Guianas that stays around 5.8 cm standard length. Its vibe is very "tetra-like" - quick, active, and happiest when its kept in a proper group with open swimming space and some cover.
Kaie's shield pleco
Corymbophanes kaiei
Small loricariid catfish from the Upper Potaro (Potaro River drainage above Kaieteur Falls) in Guyana; described as having distinct alternating light/dark bands on the caudal fin and diagnostic armored-pleco morphology.
Kerala High Fin Barb
Oreichthys incognito
A tiny Western Ghats barb with a soft gold sheen and a neat dark bar in the dorsal fin. It comes from cool, crystal-clear forest streams, so it really shines in a planted, well-oxygenated tank and a good-sized group where the shy fish feel safe and color up.
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Knodus victoriae
Knodus victoriae (Steindachner, 1907)
This is a tiny South American tetra from Brazil’s Parnaiba River basin that stays pocket-sized and cruises the midwater in a loose group. In nature it has even been seen tailing Corydoras catfish to snatch food from the sediment cloud they kick up, which is a fun bit of behavior to mimic at feeding time; care is basically small-tetra stuff in soft to moderately hard, slightly acidic to neutral water in the low 20s C and kept in a roomy group. Size tops out around 4.5 cm and the species itself is rarely traded, so most folks lean on care pointers from close Knodus relatives when keeping it. ([fishbase.se](https://www.fishbase.se/summary/Knodus-victoriae))