Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 424 species
Saddle wrasse
Thalassoma duperrey
This is the Hawaiian saddle wrasse - an always-on, cruise-the-rockwork kind of wrasse that constantly hunts little critters. Juveniles will sometimes do cleaner-fish behavior, then as they grow they turn into bold, fast, snack-hunters that can rearrange your clean-up crew.
SAIAB goatfish
Upeneus saiab
Upeneus saiab is a small demersal goatfish from northern Mozambique that cruises sandy bottoms and uses its chin barbels to hunt little critters. In fresh colors it has a subtle pale lateral stripe and a really eye-catching tail pattern (red oblique bars on the upper lobe and a mostly red lower lobe with a dark tip). This one is basically a wild marine fish from deeper water, so its more of a research/taxonomy fish than a realistic home-aquarium species.
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.
Sailfin cardinalfish
Quinca mirifica
This is a chunky, almost jet-black cardinalfish with a crisp white tail and an absurdly tall second dorsal fin - it looks like it belongs in a comic book villain lair. It hides in caves and crevices by day and comes out to hunt at night, and the males mouthbrood the eggs (with a wild courtship color change to bright silvery-white). It is a super range-restricted Western Australia species, so you do not see it often in the hobby.
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 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.
Sandyback stingaree
Urolophus bucculentus
A large offshore stingaree endemic to southeastern Australia, typically found on soft bottoms along the outer continental shelf and upper slope (reported depth range about 65–265 m). Maximum reported length is at least ~80 cm TL (some references report up to ~89 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.
Sargassum triggerfish
Xanthichthys ringens
Xanthichthys ringens is that slick, open-water-ish Atlantic trigger that looks like it got dusted with tiny freckles, then finished off with a red-trimmed tail. In the wild it hangs on deeper reef slopes and the juveniles cruise around floating Sargassum, which is just a cool life story for a trigger. Its vibe is generally calmer than the really nasty trigger species, but it is still a triggerfish with real teeth and opinions once it settles in.
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.