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
Bearded puffer
Pao barbatus
This is a chunky little Mekong River puffer that gets a cool "bearded" look from the dark spotting around the lips. It is one of those puffers that acts like a tiny water-dog - always watching you, always investigating, and always ready to crunch something shelled. Not a great community fish though, because puffers are basically curious biters with a beak.
Bearded shoveljaw carp
Onychostoma barbatum
Onychostoma barbatum is a freshwater cyprinid from China. Adults inhabit streams with gravel bottoms and reach about 17.6 cm standard length; aquarium care should emphasize high water quality and strong oxygenation typical of stream-dwelling cyprinids.
Beni whiptail catfish
Rineloricaria beni
Skinny little whiptail from Bolivia with a super long tail and camo pattern that blends right into sand and leaf litter. They are gentle bottom grazers that do great in groups, and the males are awesome dads, fanning a clutch of eggs in a tight cave until they hatch.
Betta
Betta splendens
Betta fish, also known as Siamese fighting fish, are popular for their striking colors and flowing fins. They are known for their territorial nature, especially males, which can display aggressive behavior towards each other.
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 cichlid
Acaronia nassa
Acaronia nassa is that oddball Amazon cichlid with the huge eyes and a big, suction-style mouth - it is built to ambush little fish in dim, tannin-stained water. In the tank it is usually more chill than its predator vibe suggests, but anything that fits in its mouth is absolutely on the menu.
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.
Black carp
Mylopharyngodon piceus
This is the big mollusk-crushing carp with the crazy pharyngeal teeth - once it hits juvenile size it starts hunting snails and clams and, as an adult, it is basically built to eat shells. It gets absolutely enormous (think pond/lake fish, not aquarium fish), and it tends to cruise low and feed near the bottom.
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.
Blackhawk catfish
Wallago micropogon
Wallago micropogon is one of those true monster Mekong catfish - long, dark, and built like a living vacuum cleaner with an absurdly big mouth. In the wild it is a straight-up fish eater that cruises flooded forests and river edges, and in an aquarium it is basically a predator display animal that needs pond-level space.
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.