Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 541 species
Bailian cave loach
Micronemacheilus bailianensis
A small freshwater nemacheilid (stone loach) described from Bailian Cave near Liuzhou City, Guangxi, China; maximum recorded size about 4 cm SL. Troglobitic/cave-associated species with limited natural distribution.
Bajiang Yunnan loach
Yunnanilus bajiangensis
This is a tiny Chinese stone loach from Yunnan that lives down on the bottom and stays pretty small (around 6.5 cm max). Honestly, its "cool factor" is more about being a super-local river fish than being a flashy aquarium species - and because it is listed as Critically Endangered, its conservation status is the big headline here.
Bakongo cichlid
Thoracochromis bakongo
Thoracochromis bakongo is a small riverine haplochromine cichlid from the lower Congo/Kasai systems in DR Congo, reaching about 10.8 cm TL (~4.3 in). Aquarium breeding behavior for this specific species is not consistently documented in major references, so avoid stating confirmed maternal mouthbrooding unless you can cite a species-level source.
Banded Batasio
Batasio fasciolatus
This is a small hillstream bagrid catfish from the Tista drainage up in the Brahmaputra system. It spends a lot of time tucked under rocks and comes alive more at dusk and at night, so the more caves and crevices you give it, the more you will actually see it. The vertical banding is super sharp in good condition, and they really appreciate cool, oxygen-rich flow.
Banded dwarf three-barbel catfish
Nannoglanis fasciatus
This is a tiny little Ecuadorian heptapterid catfish with bold banding - a real under-the-radar oddball that almost never shows up in shops. Since there is basically no solid aquarium-care literature for it, I would treat it like a small, shy, bottom-hugging Amazon/upper Amazon tributary catfish: lots of cover, gentle flow, and clean, well-oxygenated water.
Banded Leporinus
Leporinus fasciatus
Banded Leporinus are those torpedo-shaped, black-and-yellow striped fish that look like they're wearing a little prison outfit-and they stay on the move. They've got a ton of personality and they're awesome to watch cruising and picking at stuff, but they're also the kind of fish that will redecorate your tank and "taste test" anything soft-looking.
Bandi cichlid
Wallaceochromis signatus
Wallaceochromis signatus is a West African (Guinea, Kolente basin/Bandi River) dwarf cichlid that has appeared in the hobby under trade names such as “Bandi I/Bandi 1” and “Guinea” prior to/alongside its formal description. It is a cave-associated dwarf cichlid; provide cover and caves and expect heightened territoriality during breeding.
Banjo catfish
Xyliphius kryptos
Xyliphius kryptos is a small banjo catfish (family Aspredinidae) from the Lake Maracaibo basin of Venezuela and Colombia. It reaches about 11 cm SL and is cryptic and nocturnal, typically resting buried in soft substrate or among leaf litter by day and foraging along the bottom at night.
Barred topminnow
Quintana atrizona
This is a tiny Cuban livebearer that likes to lurk in thick plants and do that classic livebearer "hover and peck" routine all day. The cool part is the subtle black barring and how the fish kind of vanishes into floating plants, then pops right back out when food hits the water.
Barrens topminnow
Fundulus julisia
Fundulus julisia is a rare Tennessee Barrens Plateau topminnow that lives near the surface in springs and spring-fed creeks, often around aquatic vegetation, feeding largely on small aquatic insects. It is federally listed as Endangered (U.S., 2019) and is the focus of captive propagation and reintroduction efforts.
Bates' labeobarbus
Labeobarbus batesii
This is a large freshwater African cyprinid (genus Labeobarbus) reported from Cameroon, Chad, and Gabon. It is not a commonly profiled aquarium species; husbandry information is limited in mainstream hobby references.
Bathybagrus platycephalus (claroteid catfish)
Bathybagrus platycephalus
This is a Lake Tanganyika claroteid catfish (Bathybagrus platycephalus; synonym Chrysichthys platycephalus) reported from deeper water (about 20-110 m) and associated with rocky substrate. It reaches ~22 cm TL and is a demersal predator, so small fish may be eaten if they fit in its mouth.