Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 419 species
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.
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.
Blue Green Chromis (Green Chromis)
Chromis viridis
Blue Green Chromis are those shimmery little green-blue darts you'll see zipping around the top of a reef tank, always looking like they're catching the light just right. They're super fun in a group because they hover and cruise together, but they've got a bit of a "pecking order" thing going on if the tank's tight or the group's too small.
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.
Blueline demoiselle
Chrysiptera caeruleolineata
This is one of those damsels that looks like it should be a little terror, but its vibe is way more chill than the classic blue devils. You get that bright blue body with a clean line detail, and it spends a lot of time zipping low around the rockwork like it owns a tiny little neighborhood.
Bluespotted angelfish
Chaetodontoplus caeruleopunctatus
This is one of those super underrated Chaetodontoplus angels - dark body absolutely peppered with electric-blue spots and a bright yellow tail that pops under reef lighting. Its also a Philippines endemic, so you do not see them every day, and they tend to be a bit shy until they settle in and start cruising the rockwork looking for snacks.
Bluespotted dottyback
Pseudochromis persicus
This is a bigger dottyback from the Persian Gulf area that lives tight to rocky reef crevices and will absolutely claim a little cave as its home. Gorgeous dark body with bright blue spotting, but it has that classic dottyback attitude - tough, alert, and a bit territorial once it settles in.
Bluespotted stargazer
Xenocephalus elongatus
This is a deepwater stargazer that likes to sit on sand and basically "look up" for a meal, with those classic top-mounted eyes and a big ambush-predator mouth. It is a wild-caught marine fish from the Indo-West Pacific, and while it shows up in the aquarium trade sometimes, it is really more of a specialty oddball than something most home tanks can sensibly house long-term.
Bluestriped chub
Kyphosus ocyurus
Kyphosus ocyurus is that slick-looking sea chub with the wavy blue and yellow stripes that make it look like it was painted on. It cruises rocky shorelines and reefs and will also show up in little schools (sometimes mixed with other chubs), especially around drop-offs or even floating debris offshore. It gets way too big and too active for normal home tanks, but it is a really cool fish to spot in the wild.
Blunt scalyhead
Trematomus eulepidotus
Blunt scalyhead is an Antarctic nototheniid that cruises the Southern Ocean continental shelf, and its youngsters even hang around surface krill swarms when food is thick. It lives in near-freezing seawater (-1.8 to 0.9 C), so this is a public-aquarium cold-room fish, not something for a home tank. ([fishbase.se](https://www.fishbase.se/summary/Trematomus-eulepidotus.html))
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.