Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 563 species
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.
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.
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.
Sanzo's goby
Lesueurigobius sanzi
Sanzo's goby is a small offshore goby from the eastern Atlantic and western Mediterranean that lives out on muddy sand/mud bottoms in fairly deep water. Its whole vibe is a subtle, bottom-hugging demersal fish rather than a rockpool goby, so its "best life" is more about open sandy areas than reefy structure.
Saul's whale catfish
Denticetopsis sauli
This is one of those ultra-tiny South American whale catfish that most people will never see in the trade - it tops out around 2 cm. Its whole vibe is "secretive little bottom-hanger" from blackwater-style habitats, so in an aquarium it would spend a lot of time tucked into leaf litter and small caves if you could even source one.
Saw-spined round ray
Urotrygon serrula
Urotrygon serrula is a small round stingray from the Eastern Pacific that spends its time hugging the bottom in coastal waters. It is not really an aquarium species - even though it stays fairly small, it is a marine ray with specialized needs and a venomous spine, so it belongs in professional-scale setups, not a typical home tank.
Saya scaldfish
Arnoglossus sayaensis
Arnoglossus sayaensis is a marine lefteye flounder (Bothidae) described from the Saya de Malha Bank in the western Indian Ocean; FishBase lists a maximum size of 14.7 cm SL. It is reported from deep water (about 191–254 m) and is a bottom-dwelling flatfish.
Scale-eyed flounder
Lepidoblepharon ophthalmolepis
Deepwater bathydemersal citharid flounder from the western Pacific, reported from ~310–428 m on mud bottoms. Notable for very large eyes on the right side that are covered with scales. Rare and apparently not marketed; aquarium husbandry is essentially undocumented and this species is not a practical home-aquarium fish.
Scalycheek shrimpgoby
Vanderhorstia lepidobucca
This is a tiny shrimp-associated goby described from Sulawesi, Indonesia. Like other Vanderhorstia, it is associated with burrows made by alpheid snapping shrimp (Alpheus spp.), where the goby typically hovers/stands guard near the burrow entrance. Maximum reported size is 4.0 cm SL.
Scaly-headed triplefin
Karalepis stewarti
This is a New Zealand triplefin that hugs rocky reef structure and comes out more at night, so you often spot it perched and watching everything rather than cruising the water column. It tops out around 15 cm and lives in cool-temperate coastal water, picking at tiny crustaceans and mollusks.
Schmidt's hillstream catfish
Glyptothorax schmidti
This is one of the little Asian hillstream catfish that lives in fast, cool, super-oxygenated water and literally clings to rocks with a sticky belly pad. In an aquarium its whole vibe is "powerhead + smooth stones + pristine water," and if you nail that setup its rock-hugging behavior is seriously cool to watch.