Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 654 species
Starhead topminnow
Fundulus dispar
Fundulus dispar is a small native U.S. topminnow associated with vegetated standing waters and quiet pools/backwaters. It is known for reflective "star" spots on the head, and FishBase notes it can be difficult to maintain in aquaria long-term.
Stellate tadpole-goby
Benthophilus stellatus
This is one of those weird little bottom-huggers from the Black Sea/Azov/Caspian region - big head, narrow tail, and a body covered in tiny bony bumps. It spends its time on mud and sand in cooler water, picking at small invertebrates, and it is way more of a coldwater/brackish oddball than a typical tropical aquarium goby.
Stream catfish
Pseudobagarius macronemus
This is a tiny little akysid stream catfish from eastern Sumatra that spends its time down low, poking around the bottom (benthopelagic). The weird part with this one is the name - a lot of sources treat it as Pseudobagarius macronema, and you will see it sold or listed under either spelling.
Striped clingfish
Derilissus vittiger
This is a tiny little Western Atlantic clingfish that lives down on deeper reefs and clings to hard stuff with its belly suction disk. Its whole vibe is cryptic and hidey, more like a micro-predator you would spot while peering into reef rockwork than a fish that cruises around the tank. Honestly, it is super cool biologically, but it is not a realistic home-aquarium species for most people.
Striped goby
Gobius vittatus
A small Mediterranean marine goby found mainly on coralligenous/rocky bottoms (often ~15-50+ m), known for its pale body with a dark lateral stripe; it is shy and retreats quickly to crevices. In aquaria it is a cool-water Mediterranean species rather than a typical tropical reef goby.
Stripe-face Calamiana
Eugnathogobius mindora
This is a teeny-tiny estuary goby that hangs out on the bottom in mangrove and tidal creek habitats. Its little striped face and speckly fins are the main "wow" factor, but the real charm is watching it perch and scoot around like a mini dragon. Not something you see in the aquarium trade much, and it is easy to mis-ID as other small brackish gobies.
Stripefin poacher
Xeneretmus ritteri
This is that quirky, armored little bottom-creeper from deep, cold water off Southern California and Baja. It tops out around 16 cm and shuffles over soft mud with stiff, paddle-like fins, which is fun to watch. Super cool fish, but it really needs a chilled marine setup to be comfortable.
Stripefin ronquil
Rathbunella hypoplecta
This is a little bottom-hugging California coast fish that hangs around rocky and sandy spots and spends a lot of time tucked into structure. It eats small invertebrates and the male actually guards the eggs, which is pretty cool if you are into fish with real parenting behavior.
Stripefin ronquil
Rathbunella alleni
Rathbunella alleni is a little bottom-hugging coastal marine fish from California down into Baja, the kind that spends its time tucked around structure and cruising the seafloor. Its claim to fame is that slick blue stripe running along the anal fin (especially noticeable on males), plus that blenny-ish, prickleback vibe that makes it look like it belongs in a tidepool documentary.
Suborbital lanternfish
Diaphus suborbitalis
This is a little deep-sea lanternfish from the Indo-West Pacific that spends its life way down in the dark and uses photophores (light organs) like a built-in nightlight. It tops out around 7.3 cm standard length and is a true pelagic ocean fish, not something you will realistically see in the aquarium trade.
Sunda viviparous brotula
Ungusurculus sundaensis
This is a tiny little reef-dwelling brotula that lives tucked into cracks and crevices in very shallow water. The wild thing about these guys is they are livebearers (viviparous), which is pretty unusual among marine fishes, and they tend to be super cryptic and solitary.
Sundolyra catfish
Sundolyra latebrosa
This is a super obscure little bagrid catfish from northwestern Sumatra, and its whole vibe is "hidden" - the species name latebrosa literally points at how cryptic and rarely seen it is. In the wild it is known from a very limited drainage, and in the hobby it is basically unicorn-level rare, so most "care" advice you see online is going to be educated guesswork rather than proven aquarium experience.