Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 451 species
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.
Black loach
Eonemachilus niger
This is a tiny, deep-velvet-black stone loach from Yunnan, China, with the odd detail that the tail fin is not black like the rest of the fish. Its wild range is extremely limited, so its aquarium presence is basically nil - this is more of a conservation-interest species than something you will actually see for sale.
Black morpho tetra
Poecilocharax weitzmani
Poecilocharax weitzmani is one of those tiny blackwater oddballs that acts more like a little darter than a typical tetra - it hangs low, darts between cover, and the males can get pretty showy with fin-flares. The really cool part is they are cave breeders with male brood care, which is not what most people expect from a small characin. Give them very soft, acidic, super-clean water and lots of leaf litter and hidey holes, and they settle in and start showing their best colors.
Black Neon Tetra
Hyphessobrycon herbertaxelrodi
Black neons are one of those little tetras that look kinda understated until the light hits them-then that bright stripe pops and they shimmer when the school turns together. They're super chill, always cruising mid-water, and they make a tank feel "alive" without being hectic. If you keep a nice group, they get bolder and you'll see way more of their personality.
Black redhorse
Moxostoma duquesnei
Black redhorse are sleek river suckers that really come alive in clean, fast-flowing runs and riffles - they are basically a living indicator that the water quality is good. They cruise the bottom in little groups and pick at insect larvae and tiny crustaceans, and in spring the males can show pink and dark striping when they are in spawning mode.
Black River madtom
Noturus maydeni
Noturus maydeni is a tiny little riffle catfish from the Ozarks that lives tucked into cool, clear, fast water over gravel and rocks. Its claim to fame is being super range-limited (Black and St. Francis river drainages), and like other madtoms its pectoral spines can give you a nasty poke if you grab it wrong.
Black Skirt Tetra (Black Widow Tetra)
Gymnocorymbus ternetzi
Black skirts are those little "suit-and-tie" tetras with the dark bands and flowing fins that look way fancier than they should for how tough they are. They're super active midwater fish, and when you keep a proper group they do that tight, zippy schooling thing that makes the whole tank feel alive. Just give them enough buddies and finny tankmates they won't be tempted to nip.
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.