Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 232 species
Fish doctor
Gymnelus viridis
Gymnelus viridis (the fish doctor) is a cold-water Arctic eelpout with a long, scaleless, eel-like body that likes hugging the bottom in sand/mud and seaweed. It is a true marine fish from polar seas, feeding on crustaceans and other meaty bottom critters - basically a little benthic hunter built for chilly water.
Flabby sculpin
Zesticelus profundorum
This is a tiny deepwater sculpin from the North Pacific that lives way down on the bottom, not cruising around the reefs like typical “aquarium marines”. The wild habitat is cold, dark, and high-pressure (down to around 2580 m), so it is basically a “look up in a museum database” fish rather than something you can realistically keep at home.
Flagfin cardinalfish
Jaydia truncata
Jaydia truncata is a nocturnal reef-associated cardinalfish found in inshore waters of the continental shelf in the Indo-Pacific. It reaches about 15 cm total length and in aquaria should be provided with calm tankmates and ample shelter/overhangs.
Flame cardinalfish
Fowleria amblyuroptera
Fowleria amblyuroptera is a very small Indo-Pacific/Western Pacific cardinalfish (to about 4 cm SL) associated with coastal reefs/bays and is primarily nocturnal. Like many cardinalfishes, the male mouthbroods the eggs; in captivity it should be provided with ample shelter and offered appropriately sized meaty foods/planktonic items.
Frogmouth sculpin
Icelinus oculatus
Frogmouth sculpin is a little coldwater, bottom-hugging marine sculpin from the Pacific coast. It spends its time sitting on the substrate and blending in like a living rock, then darts short distances when food shows up. Super cool fish, but it is absolutely not a warm reef tank animal - it really wants chilly, oxygen-rich water and a calm setup.
Fulvopelvis shrimpgoby
Vanderhorstia fulvopelvis
This is a tiny little shrimpgoby from Okinawa (Japan) that lives down on sand and rubble and does the classic prawn-goby thing - hanging at a burrow entrance and relying on a snapping/pistol shrimp roommate for the digging. Its name literally points at a shiny yellow mark on the male's pelvic fin, and the fish itself is patterned with yellow spotting and a clean stripey/barred look.
Gold-marked shrimpgoby
Vanderhorstia auronotata
This is a tiny little shrimp-goby from Indonesia that hangs out on silty sand slopes and does the whole burrow-living thing with an Alpheus snapping shrimp. The cool part is the bright orange-yellow spotting/lines over a pale body - it is one of those blink-and-you-miss-it gobies that looks even better up close than from across the tank.
Goldstripe ponyfish
Karalla daura
Silvery little schooling ponyfish with a bright gold stripe and that classic slipmouth look. They cruise muddy shallows in tight groups and, like other ponyfish, have a cool bacterial light-organ setup for signaling at night. Not a common aquarium fish, but super interesting if you are set up for marine schooling species.
Gorgeous prawn-goby
Amblyeleotris wheeleri
Amblyeleotris wheeleri is that classic shrimp-goby that picks a sandy spot, makes a burrow, and basically turns your tank into a little nature documentary if you pair it with a pistol shrimp. It hangs at the burrow entrance, does the whole lookout routine, and flashes those red bands and blue speckling when it is settled in.
Green-peritoneum snailfish
Paraliparis entochloris
Paraliparis entochloris is a deepwater snailfish from the northwest Pacific, and the name is basically calling out its weird party trick: it has a green peritoneum (the lining around the organs) that can show through the body wall. This is not an aquarium fish at all - it is a cold, deep, bottom-associated species that is mostly known from scientific collections rather than the hobby.
Guaymas goby
Quietula guaymasiae
This is a small, bottom-hanging goby from Mexico's Gulf of California, usually found in shallow estuaries and lagoons. The really cool bit is it can do facultative air-breathing, so its built for those warm, low-oxygen, mucky spots. Its not a typical community freshwater fish - think brackish/marine lagoon goby that wants sand or mud and calm water.
Gubal goatfish
Upeneus gubal
Upeneus gubal is a tiny Red Sea goatfish that cruises over sand and mud and uses its little chin barbels to feel around for food. Its max size is under 9 cm standard length, so it is more of a "dwarf" goatfish compared to the bigger goatfish you see in the trade. Because it is a wild marine demersal species from the Gulf of Suez area, it is not something you will run into with a normal, well-established aquarium care playbook.