Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 555 species
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-tail glassy perchlet
Ambassis urotaenia
This is one of those see-through glassy perchlets where you can literally watch the organs shimmer when it turns-super cool in the right lighting. In the wild it hangs around river mouths and mangroves and cruises in groups, so it does best when you keep a little gang of them and give them some open swimming room.
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.
Banggai Cardinalfish
Pterapogon kauderni
Banggai cardinals just sort of hover like little underwater satellites, and the bold black bars with those long, polka-dotted fins look unreal under reef lighting. They're super chill most of the time, but once a pair forms you'll see real "fish drama," and the male will even mouthbrood the babies like a champ.
Barbados vent eelpout
Thermarces pelophilum
This is a deep-sea eelpout that was collected at cold seeps off Barbados - think pitch-black, high-pressure ocean bottom, not an aquarium fish. It tops out around 12.4 cm and basically lives in a world of mud, methane, and seep life, which is a pretty wild niche for a fish.
Barbed pipefish
Urocampus nanus
Urocampus nanus (barbed pipefish) occurs in protected inshore and estuarine habitats among seagrass (Zostera) in the Northwest Pacific (southern Japan and adjacent coasts). Like other syngnathids, males brood eggs in a pouch under the tail and produce fully formed young.
Barbedwire-tailed skate
Notoraja martinezi
Notoraja martinezi is a deepwater skate from the eastern Pacific (Costa Rica down to Ecuador) that lives way down on soft bottoms. The tail is the giveaway - it is lined with strong, hooked thorns that really do look like barbed wire. This is absolutely not an aquarium fish; it is a cold, high-pressure deep-sea animal with basically no practical home care info because it is not kept in the hobby.
Barred mudskipper
Periophthalmus argentilineatus
This is one of those classic "walks around like it owns the place" mudskippers-big goofy eyes, climbs, hops, and spends a ton of time out on the mud when it's humid. In the wild it lives on intertidal mangrove/nipa mudflats and even shuttles between little pools and open air, hunting worms, insects, and small crustaceans. It's super fun to watch, but it really wants a brackish paludarium setup (not a normal aquarium).
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.
Barred-chin blenny
Rhabdoblennius nitidus
This is a tiny intertidal combtooth blenny that lives right up in surge channels and tide pools, so it is built for getting smacked around by waves and still acting like it owns the rock. Males guard eggs in little nests and the species has some seriously interesting breeding behavior, which is very blenny-like. In the hobby its not a common aquarium fish, but if you ever run into one you would treat it like a small, rock-perching marine blenny with lots of hiding spots and strong oxygenation.
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.