Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 665 species
Kanabo Badis
Badis kanabos
Kanabo Badis is a slender little chameleonfish from Indias Brahmaputra system that stays tiny and loves sneaking through plants and leaf litter. Males flash mood colors and posture over small patches, but most of the time they are busy stalking tiny live foods and making quick ambush dashes.
Kaup's pipefish
Enneacampus kaupi
Enneacampus kaupi is a skinny little West African pipefish that likes to lurk through algae and basically cosplay as a piece of vegetation. Its whole vibe is slow, sneaky, and ultra-picky at feeding time - super cool if you enjoy target-feeding and watching hunting behavior up close. It shows up from brackish estuaries and coastal rivers, so a slightly brackish setup is often the safest long-term direction.
Kazunagi
Zoarchias veneficus
A tiny eel-like prickleback from Japans cool rocky shores, it threads through seaweed and crevices like a living shoelace. Tops out around 7 cm and spends its time peeking from rock cracks and snapping up tiny crustaceans, so a tank full of snug caves is its happy place.
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.
Kerala sole
Zebrias keralensis
This is a small, sand-hugging marine sole from the Kerala coast area, with that classic zebra-style banding that helps it vanish the second it settles onto the bottom. Its whole deal is staying low, burying in fine sand, and picking off tiny bottom critters - super cool fish, but not really something you see in the aquarium trade.
Kermadec dwarfgoby
Eviota kermadecensis
This is a true micro-goby from the Kermadec Islands (Raoul Island area) - the kind of tiny reef fish that basically lives in the nooks and crannies and makes you stare at your rockwork more. Its whole vibe is cryptic and subtle, but that is exactly why dwarfgobies are so addicting once you start noticing them.
Kimura's sole
Aseraggodes kimurai
Aseraggodes kimurai is a tiny little marine sole (flatfish) from the western Pacific that spends its life glued to the bottom, blending into sand and rubble like a living leaf. Its whole vibe is stealth and camouflage, and it is the kind of fish you forget is even there until it scoots and re-buries itself. Super cool animal, but honestly not really an aquarium fish because it is a specialized bottom-dweller that wants live micro-food and a mature sandbed.
Knight Goby
Stigmatogobius sadanundio
Knight gobies are those chunky, spotty "estuary" gobies that perch on the bottom, scoot between caves, and then suddenly dash out like little predators. They're super fun to watch because they're territorial in a goby way (lots of posturing) and they'll even breed in caves when they're happy. They do best long-term when you treat them like an estuary fish: hard, alkaline water and (often) a bit of salt.
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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))
Kobe flounder
Crossorhombus kobensis
A small lefteye flounder (Bothidae) from the Northwest Pacific that lives on sand and shell bottoms at 50–275 m depth. Males develop a dark-blue stain on the blind side and an elongated filamentous pectoral fin. It is a marine, demersal, temperate species of no fishery interest and is not seen in the aquarium trade.
Kribensis
Pelvicachromis pulcher
Kribensis are one of those dwarf cichlids that pack a ton of personality into a small fish-especially once they pick a cave and start acting like proud homeowners. The female's purple/red belly when she's in breeding mode is the real show-stealer, and the pair will do seriously impressive parent-care if they spawn.
Kuiter's deepsea clingfish
Kopua kuiteri
Kopua kuiteri is a tiny deepwater clingfish from southern Australia that lives way down on the seafloor, not in the usual home-aquarium world. It is the kind of fish that sticks to hard surfaces with a suction disc and is basically a cool biology oddball rather than something you will realistically keep at home.