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
Bertelsen's duckbill conger
Gavialiceps bertelseni
Deepwater marine conger eel from off western/southwestern Madagascar (western Indian Ocean), reported from roughly 670–1200 m depth; maximum length about 84 cm TL (reported for males). Not a typical aquarium species due to deepwater habitat.
Bicolored foxface
Siganus uspi
Siganus uspi is that super sharp-looking Fiji rabbitfish with the hard two-tone split - dark front half, bright yellow rear half. It is an algae-grazer that tends to cruise calmly, but it has venomous fin spines, so you treat it with respect any time you are netting or working in the tank.
Bidentate conger
Xenomystax bidentatus
A deepwater conger eel (family Congridae) from the tropical western central Atlantic off northern South America, reported from roughly 494–604 m depth; not a species typically encountered in the aquarium trade.
Big-eye anchovy
Anchoa lamprotaenia
Anchoa lamprotaenia is a slim, silvery little anchovy from warm western Atlantic coastal waters, with that clean silver side stripe and big eyes that make it look extra sharp. It is a pelagic, open-water schooling fish that spends its life cruising near the surface and picking zooplankton out of the water column. In practice its not really an aquarium species, because it wants constant swimming room, high oxygen, and a steady supply of tiny foods.
Bigeye brotula
Glyptophidium longipes
Glyptophidium longipes is a deepwater cusk-eel (brotula) from the western Indian Ocean - a slender, eel-ish fish with oversized eyes and long ventral-fin rays. It is a bathyal slope species from a few hundred meters down, so its real-world needs (cold, dark, high-pressure habitat) make it essentially an observation-only "research" animal rather than a practical aquarium fish.
Bigeye clingfish
Kopua nuimata
Kopua nuimata is a tiny deepwater clingfish with big eyes and a neat pink-and-orange banded pattern. It lives way down on reefy slopes (roughly 160-337 m), so its "care" is mostly academic - its natural habitat is cold, dark, high-pressure water that we just do not replicate in home aquariums.
Bigeye lightfish
Danaphos oculatus
Tiny deep-sea bottlelight that hangs out 400-650 m down, flashing belly photophores and peering with big eyes. Adults stay petite at about 5.7 cm and turn up from the NE Pacific (British Columbia to California) out to Hawaii, with records in the SE Pacific too. Not an aquarium fish at all - it lives in cold, high-pressure darkness and munches large copepods, so it is one to admire in field guides rather than tanks. ([fishbase.se](https://fishbase.se/LarvalBase/Summary/LarvaSummary.php?genusname=Danaphos&speciesname=oculatus&utm_source=openai))
Bigfin shrimpgoby
Vanderhorstia macropteryx
This is one of those classic sand-dwelling shrimp gobies that posts up at a burrow entrance and keeps watch while its pistol shrimp roommate does the digging. In the tank its vibe is basically "little sentinel" - calm, bottom-oriented, and super fun to observe if you give it sand and a secure lid (they can jump).
Blache's ooze eel
Ilyophis blachei
This is a deep-sea cutthroat eel that lives far down the continental slopes, so it is a neat species to read about rather than keep. Adults reach around 80 cm and cruise cold 4-9 C water, picking off deep-sea crustaceans like little squat lobsters. Super cool biology, but definitely not an aquarium fish.
Black-chest cardinalfish
Xeniamia atrithorax
A tiny deep-reef cardinalfish described in 2016 that reaches about 3.0 cm SL. It has a distinctive dark melanophore patch on the chest/isthmus region and shows male mouthbrooding (brooding eggs reported in males). Recorded from the South China Sea off central Vietnam, with later records from Taiwan; reported from ~40–119 m depth (often ~70–119 m).
Black dwarfgoby
Eviota vader
Eviota vader is a tiny, purplish‑black dwarfgoby described in 2025 and named for Darth Vader; it is known from a single specimen collected at 4 m on a Porites coral bommie in the Tufi fjord area of Papua New Guinea. The holotype measured 11.5 mm SL and the species’ overall dark purplish‑black coloration is unique among described Eviota.
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.