Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 232 species
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 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.
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.
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.
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.
Blue blanquillo
Malacanthus latovittatus
This is the long, torpedo-shaped tilefish with the blue front end and that bold black stripe down the side. In the wild it hangs over outer reef slopes and will also claim a burrow area, so in a tank you are basically keeping a cruise-missile that also wants a safe "home base" and a tight lid.
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.
Blunt-snouted grenadier
Ventrifossa obtusirostris
This is a deep-sea rattail (grenadier) from the southeastern Pacific, living way down on the slope around 750-800 m deep. It is a long, tapering, big-headed macrourid that tops out around 30 cm, and its short, blunt snout is basically the whole idea behind the species name.
Bob Ward's bluespotted maskray
Neotrygon bobwardi
A bluespotted maskray (Neotrygon bobwardi) described as part of the former Neotrygon kuhlii species complex, reported from Indonesia in the eastern Indian Ocean (notably western Sumatra).
Bradbury's batfish
Coelophrys bradburyae
A tiny deep-sea batfish (family Ogcocephalidae) known from deep water off Japan; the original description was based on a single specimen collected at 557–595 m, and the species remains poorly known.
Bristlemouth
Gonostoma denudatum
Gonostoma denudatum is a deep-sea bristlemouth that spends its life out in the dark, open ocean and does that classic daily up-and-down migration (deeper in the day, shallower at night). It has silvery flanks, a darker back, and light-producing photophores that start showing up as it grows - super cool biology, but not something you would ever realistically keep in a home aquarium.