Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 528 species
Blackfin pygmy skate
Fenestraja atripinna
Fenestraja atripinna is a small, deepwater (upper slope) bathydemersal pygmy skate from the Western Central Atlantic (e.g., Bahamas/Cuba/Florida region) reported from ~310–870 m (often deeper than ~440 m). Biology is poorly known; like other skates it is oviparous (egg cases).
Blackfin slatey
Diagramma melanacrum
This is a big Indo-West Pacific sweetlips/grunt that cruises reefs and hangs in caves, and it gets that cool yellow-and-silver look sprinkled with dark spots plus the really obvious black on the lower tail and the pelvic/anal fins. Juveniles show up in murkier estuary and silty reef areas, then the adults shift deeper and often sit in small groups until they go hunting at night. In aquariums its size is the whole story - it is a public-aquarium kind of fish once grown.
Blackfin stargazer
Ichthyscopus nigripinnis
This is a little sand-sitting stargazer from Australia that likes to lie in wait with its eyes up top and nail passing prey. That black mark on the front part of the dorsal fin is basically its signature. Cool fish, but its more of a wild marine predator than something you set up in a typical home aquarium.
Blackflash ribbonfish
Trachipterus jacksonensis
This is one of those true open-ocean ribbonfish - long, silvery, and super weird-looking in the best way, with a tall red dorsal fin when its in good shape. Its a deepwater, roaming marine species that occasionally turns up nearshore or even in estuaries, but its not something you can realistically keep in a home aquarium.
Black mouth conger
Bathycongrus melanostomus
This is a deepwater congrid eel described from eastern Taiwan. It is marine and bathydemersal (reported to ~300 m). Diagnostic features include a much reduced caudal fin and blackish mouth cavity and gill chamber; the pectoral fin is yellowish with a black margin. Aquarium availability and behavior/husbandry are not well documented for the species.
Blackspot razorfish
Iniistius dea
This is one of the coolest "knife-bodied" wrasses - it hangs over open sand and, when it gets spooked or wants to sleep, it literally torpedoes straight into the sand. Give it a deep, fine sand bed and it will act totally different (and way more natural) than a typical rock-hugging reef wrasse. Adults are usually shy and cruisy with tankmates, but they are not forgiving about rough handling or sketchy setups.
Blackspot skate
Dipturus campbelli
This is a long-nosed skate from South Africa to Mozambique with neat black speckles and a smooth, hovercraft kind of glide. It lives deep in cool water and can reach close to a meter, so it is a public-aquarium fish that needs chilled, ocean-parameter water and a huge footprint to cruise.
Blackspotted snake eel
Quassiremus ascensionis
A tropical marine snake eel that buries in soft substrates (sand/mud/gravel) with only the head exposed to ambush prey. Recorded to 71 cm TL and occurs mainly in the western Atlantic (also Brazil) and at Ascension Island; typically found in shallow inshore habitats to ~12 m, including sand and seagrass (turtle grass) areas.
Black verilus
Verilus sordidus
Verilus sordidus (the black verilus) is a deep-reef Caribbean ocean bass with a big eye and a seriously toothy mouth for its size. It is not really an aquarium fish - it is a deeper-water marine species that shows up around rocky bottoms and is rarely seen in the trade.
Blemished razorfish
Iniistius naevus
A small razor wrasse with that classic knife-edge profile and a pale body marked with dark blotches, it zips over open sand and then vanishes head-first into it the second it feels spooked. It lives on gentle sand slopes in the Eastern Indian Ocean and sleeps buried, so in a tank it really needs a fine, deep sand bed and a tight lid. ([fishbase.se](https://fishbase.se/summary/SpeciesSummary.php?ID=66868&genusname=Iniistius&speciesname=naevus))
Blotched catshark
Scyliorhinus meadi
Scyliorhinus meadi is a deepwater little catshark from the western central Atlantic that hangs out way down on the continental slope around 300-600 m. It is got those dark saddle-like blotches and even has tiny spots that can fluoresce yellow under blue light, which is pretty wild for a shark. This is not really an aquarium fish - it is a cold, deepwater species with specialized needs and basically no normal hobby availability.
Blueband goby
Valenciennea strigata
This is that classic gold/yellow-headed sand-sifting goby with the little blue cheek stripe-always busy, always rearranging your sandbed. In a reef tank it'll spend the day taking mouthfuls of sand, filtering out tiny critters/foods, then "snowing" clean sand back out, and it'll usually claim a burrow area (often as a pair in the wild). It's super cool behavior-wise, but you really do need a mature tank with a proper sandbed and a lid because they can jump.