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
White-cheeked goby
Rhinogobius duospilus
This is one of those little stream gobies that acts like it's glued to the rocks-its pelvic fins form a suction-cup so it can hang out in flow. Males can color up really nicely and they'll claim a favorite cave/stone like a tiny bouncer, but in a well-structured tank they're super fun to watch cruise the bottom and perch.
White-Edged (Albimarginata) Betta
Betta albimarginata
This is one of those wild bettas that feels more like a tiny aquarium predator than a "fancy fin" betta-sleek, quick, and always watching what's going on. The males are awesome with that crisp white edging on the fins, and the coolest part is the dad carries the eggs in his mouth, so you'll sometimes see him just chilling and not eating for a bit while he incubates.
White-edged cardinalfish
Jaydia albomarginatus
Jaydia albomarginatus is a small marine cardinalfish from the Western Central Pacific. Like a lot of cardinalfish it is a mouthbrooder, and FishBase notes distinct pairing during courtship and spawning - the kind of behavior thats really fun to watch when a pair settles in. Its not a big open-water swimmer, so it does best with plenty of rockwork and calmer tankmates.
Wouter's pygmygoby
Trimma woutsi
Trimma woutsi is a true pygmy reef goby - maxing out around an inch - that spends its life perched close to the rockwork in shallow reef zones. Its tiny size is the whole game here: it is perfect for a peaceful nano reef where it can pick at micro-foods all day and not get bullied off meals.
Wrestling halfbeak
Dermogenys pusilla
This is that quirky little surface-dweller with the long lower "beak" that's always cruising the top and snapping at food. The males do these goofy jaw-locking sparring matches (that's where the "wrestling" name comes from), so you'll want space and lots of floaters to keep everyone chill. They're also famous jumpers-tight lid is non‑negotiable.
Wu's goby
Wuhanlinigobius polylepis
This is a tiny mangrove-and-mudflat goby from the western Pacific that spends its time on the bottom, often in really shallow brackish areas. The cool part is how "muddy" its lifestyle is - it gets found in puddles on exposed mud at low tide and can even be partly buried, so it appreciates a soft substrate and lots of cover if you ever try one.
Xingyun Lake Yunnan loach
Yunnanilus analis
Yunnanilus analis is a little bottom-hugging stone loach from China, originally described from Xingyun Lake in Yunnan. Its species name is literally about the anal fin - it has six branched anal-fin rays, which is a weirdly specific ID feature. This one is not an aquarium regular, so if you ever actually see true Y. analis for sale, it would be a pretty unusual find.
Xiuren torrent catfish
Xiurenbagrus xiurenensis
This is a tiny little Chinese torrent catfish from the Pearl River drainage - think bottom-hugging, hidey fish that wants clean, oxygen-rich water. It stays around 10 cm/4 inches and is more of a nighttime rock-and-crevice cruiser than a "front glass" pet. If you set it up like a cool, fast stream with lots of cover, it should act way more confident.
Xixi high-plateau loach
Triplophysa xiqiensis
Triplophysa xiqiensis is a little Chinese stone loach from cool, flowing hill-stream type water, and it lives right on the bottom picking around the substrate. It is the kind of fish that spends its day cruising and perching on rocks, so it is way more about behavior and habitat vibes than flashy color.
X-ray tetra
Pristella maxillaris
This is that little see-through tetra where you can kinda make out the spine inside the body, and then it tops it off with those sharp black/yellow/white fin markings and a reddish tail. Super chill schooling fish, and it's one of those rare tetras that doesn't freak out if your water isn't "perfect Amazon blackwater" 24/7.
Yaluwak armored catfish
Yaluwak primus
This is a super rare, fast-water loricariid from the upper Ireng River system in Guyana - the kind of fish most hobbyists will only ever see in a scientific paper. Its neat party trick (for an armored catfish) is a big cluster of evertible cheek odontodes and it even lacks a normal adipose fin, replacing it with a low ridge of plates.
Yangi loach
Yunnanilus yangi
Yunnanilus yangi is a small freshwater stone loach (Nemacheilidae) described in 2024 from Yunnan, China (upper Pearl River/Nanpanjiang drainage). Species-specific aquarium guidance is limited in the literature; husbandry is typically inferred from related small Yunnanilus/Micronemacheilus-type loaches, emphasizing clean, well-oxygenated water, cover, and small foods.