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
Bibosi rivulus
Anablepsoides bibosi
A. bibosi is a tiny Bolivian rivulus from clear, fast little forest streams in the Rio Chapare. Males show fine red side stripes with dark-edged fins and they prowl near the surface like mini predators. They are springy jumpers, so a snug lid is a must.
Bigeye clingfish
Kopua nuimata
Kopua nuimata is a tiny deepwater clingfish with big eyes and a neat pink-and-orange banded pattern. It lives way down on reefy slopes (roughly 160-337 m), so its "care" is mostly academic - its natural habitat is cold, dark, high-pressure water that we just do not replicate in home aquariums.
Bigeye lightfish
Danaphos oculatus
Tiny deep-sea bottlelight that hangs out 400-650 m down, flashing belly photophores and peering with big eyes. Adults stay petite at about 5.7 cm and turn up from the NE Pacific (British Columbia to California) out to Hawaii, with records in the SE Pacific too. Not an aquarium fish at all - it lives in cold, high-pressure darkness and munches large copepods, so it is one to admire in field guides rather than tanks. ([fishbase.se](https://fishbase.se/LarvalBase/Summary/LarvaSummary.php?genusname=Danaphos&speciesname=oculatus&utm_source=openai))
Bigfin shrimpgoby
Vanderhorstia macropteryx
This is one of those classic sand-dwelling shrimp gobies that posts up at a burrow entrance and keeps watch while its pistol shrimp roommate does the digging. In the tank its vibe is basically "little sentinel" - calm, bottom-oriented, and super fun to observe if you give it sand and a secure lid (they can jump).
Bishop toothcarp
Brachyrhaphis episcopi
This is a tiny Panamanian livebearer that does best when you treat it more like a shy wild fish than a fancy guppy-lots of cover, calm vibes, and really clean water. The fun part is watching the males posture and spar while the females cruise around dropping fully-formed fry about once a month.
Blache's ooze eel
Ilyophis blachei
This is a deep-sea cutthroat eel that lives far down the continental slopes, so it is a neat species to read about rather than keep. Adults reach around 80 cm and cruise cold 4-9 C water, picking off deep-sea crustaceans like little squat lobsters. Super cool biology, but definitely not an aquarium fish.
Black-chest cardinalfish
Xeniamia atrithorax
A tiny deep-reef cardinalfish described in 2016 that reaches about 3.0 cm SL. It has a distinctive dark melanophore patch on the chest/isthmus region and shows male mouthbrooding (brooding eggs reported in males). Recorded from the South China Sea off central Vietnam, with later records from Taiwan; reported from ~40–119 m depth (often ~70–119 m).
Black dwarfgoby
Eviota vader
Eviota vader is a tiny, purplish‑black dwarfgoby described in 2025 and named for Darth Vader; it is known from a single specimen collected at 4 m on a Porites coral bommie in the Tufi fjord area of Papua New Guinea. The holotype measured 11.5 mm SL and the species’ overall dark purplish‑black coloration is unique among described Eviota.
Black-edge cabillus
Cabillus nigromarginatus
Cabillus nigromarginatus is a very small marine goby (to about 3 cm) described from Rodrigues in the Western Indian Ocean, with records including Seychelles; it is known as the black-edge cabillus.
Blackfin pupfish
Cyprinodon beltrani
Cyprinodon beltrani is a tiny Mexican pupfish from Lake Chichancanab, and the males get those dark fin accents that make them look way tougher than their size. These busy little substrate-pickers consume detritus and other tiny bits, and surprisingly, they can be feisty with each other, especially during male-to-male interactions.
Blackfin squeaker
Synodontis melanopterus
Synodontis melanopterus is a West African mochokid (squeaker/upside-down catfish) described as uniformly dark in coloration. Like other Synodontis, it has robust fin spines and is a bottom-associated fish that will use shelter; provide hiding places and be cautious when netting due to spine entanglement risk.
Black-Lined Loach
Ambastaia nigrolineata
Ambastaia nigrolineata is a little river-loach with two clean black stripes that turns into a really cool barred pattern as it grows. Keep it in a proper gang and you will see all the fun loach stuff - shadowing, clicking, and the occasional goofy "greying out" dominance squabble. It likes clean, well-oxygenated water and lots of nooks to cram into.