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
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Rummy-nose tetra
Petitella rhodostoma (Ahl, 1924) (formerly Hemigrammus rhodostomus)
This is the classic rummy-nose tetra-the one with the bright red "nose" and the crisp black-and-white tail that flashes when the whole group turns together. They're tight-schoolers, so a bigger group in a longer tank is where you really get that synchronized, hypnotic swimming. The red face also doubles as a little "health meter" since it tends to fade when they're stressed or water quality slips.
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Rummy-nose tetra
Petitella rhodostoma (syn. Hemigrammus rhodostomus)
This is the classic rummy-nose tetra - silver body, a solid red "face," and that crisp black-and-white tail that flashes when the whole group turns at once. The red nose is a legit mood ring for water quality and stress, so when they are happy and stable, they look incredible in a tight school.
Saadi dwarf stone loach
Turcinoemacheilus saadii
This is a little Iranian stone loach that lives glued to the bottom in fast, rocky streams, kinda like a tiny current-loving goby-but its a loach. The body has 7-9 dark saddle-shaped bands instead of a solid stripe, and it is built for scooting around coarse gravel and boulders in strong flow. Its not really an aquarium trade fish, but if you ever did keep one, you would set it up like a mini river tank with tons of oxygen and current.
Saikai grenadier (rattail)
Ventrifossa saikaiensis
This is a deepwater grenadier (rattail) from the western Pacific - the kind of fish that lives way down on the slope where its "aquarium" is basically cold, dark, and high pressure. It tops out around 25 cm and has that classic rattail look with a chin barbel, plus a ventral light organ. Cool animal, but realistically its not an aquarium species at all unless youre talking public-aquarium level coldwater deep-sea systems.
Salsbury's osteochilus
Osteochilus salsburyi
Think of this one as a sleek silver river barb with a subtle mid-body stripe from Laos, northern Vietnam, and southern China. It spends its day rasping algae and biofilm off rocks and wood, so it appreciates good flow and clean water. It gets close to 8 inches, so plan real swimming room and ideally keep a small group.
Salt and pepper cory (Habrosus cory)
Corydoras habrosus
This is the tiny "salt and pepper" cory that scoots around the bottom like a little wind-up toy, constantly sifting and picking through the sand. Keep them in a real group and they get way bolder-lots of quick little dashes, little pauses, and then back to foraging. They're also one of those fish that really rewards a soft sandy bottom and calm tankmates.
Samanti loach
Oxynoemacheilus seyhanensis
Oxynoemacheilus seyhanensis is a small Turkish brook loach from the Seyhan river system area - a bottom-hugger that wants clean, oxygen-rich water and lots of cover down low. In the wild it is a river fish and it's listed as Critically Endangered, so its real "cool factor" is more about being a rare, localized species than something you'll reliably see for sale.
Samoan surf sardine
Iso nesiotes
Iso nesiotes (Samoan surf sardine) is a very small surf-zone marine fish (family Isonidae) reported from places such as American Samoa and Pitcairn Island, inhabiting surf and waves around rocky headlands and reefs. Maximum reported size is about 4 cm TL; detailed life-history and aquarium husbandry information is limited.
Sand catlet
Zaireichthys wamiensis
A tiny sand-burying catfish from Tanzanias Wami River, this little guy tops out around an inch. It likes to vanish into fine sand with just its eyes showing, then dart out for micro-foods. Set it up with smooth sand, gentle flow, and small meaty foods and it will show off its quirky periscope routine.
Sand submarine
Limnichthys nitidus
Limnichthys nitidus is a tiny marine sandburrower found on surge-swept, coarse-sand patches near reefs (about 4–20 m), where it buries in sand and may occur in small groups. Aquarium suitability is not well documented in authoritative aquarium references; husbandry requirements are therefore uncertain and should be presented as experimental/rarely-kept rather than as established care.
Sangha rough catfish
Trachyglanis sanghensis
Trachyglanis sanghensis is a small African loach catfish (family Amphiliidae) known from the Sangha River near Ouesso in the Congo Basin (Republic of the Congo). Reported maximum size is about 5 cm TL.
San Marcos redtail splitfin
Xenotoca doadrioi
This is a little Mexican goodeid livebearer where the males do that awesome "blue body + orange/red tail" thing when they color up. They're super active, always grazing and pecking at surfaces, and they really appreciate cooler, clean, well-oxygenated water compared to your typical tropical livebearers.