Species Profiles
2742 articles- Glowlight Danio (Danio choprae) Care GuideDanio choprae is a small Burmese danio from Kachin State with gold and blue bands, kept as a peaceful schooling fish.
- Long-fin Zebra Danio Care GuideA selectively bred long-finned form of the zebrafish; flowing fins make it a slower swimmer best kept away from fin-nippers.
- GloFish Zebra Danio (Green) Care GuideA green-fluorescent transgenic zebra danio expressing a fluorescent-protein gene; care matches the wild Danio rerio.
- GloFish Zebra Danio (Red) Care GuideA red-fluorescent transgenic zebra danio carrying a coral-derived gene; care is identical to the wild Danio rerio.
- Danionella cerebrum Care GuideDanionella cerebrum is a tiny translucent Myanmar cyprinid, one of the smallest vertebrates and a model organism in neuroscience.
- Danionella priapus Care GuideDanionella priapus is a translucent miniature cyprinid from India, where males bear a unique genital papilla between the pelvic fins.
- Danionella translucida Care GuideDanionella translucida is a near-transparent miniature cyprinid from Myanmar reaching about 1 cm, kept in large peaceful groups.
- Pearly Rasbora Care GuideRasboroides vaterifloris is an endangered rasbora endemic to southwestern Sri Lanka, a peaceful schooler for soft, slightly acidic aquariums
- Glowlight Rasbora Care GuideTrigonopoma pauciperforatum is a slim rasbora with a luminous red lateral stripe, a peaceful schooler from blackwater peat-swamp streams of
- Axelrod's Blue Rasbora Care GuideSundadanio axelrodi is a tiny iridescent cyprinid from peat-swamp forests of the Greater Sunda Islands, requiring strict soft, acidic blackw
- Clown Rasbora Care GuideRasbora kalochroma is a larger reddish rasbora from Sundaland with two dark flank spots, a peaceful schooler needing soft, acidic blackwater
- Brilliant Rasbora Care GuideRasbora einthovenii is a slim Sundaland rasbora with a dark lateral line on a coppery body, a peaceful schooler from blackwater peat-swamp s
- Eyespot Rasbora Care GuideRasbora dorsiocellata is a compact Southeast Asian rasbora with a dark spot on the dorsal fin, a peaceful schooler for soft, acidic blackwat
- Sidestripe Rasbora Care GuideRasbora paviei is a slim, peaceful schooling rasbora from the Mekong, Chao Phraya and Mae Klong basins of Southeast Asia, tolerant of a wide
- Strawberry Rasbora Care GuideBoraras naevus is a tiny raspberry-pink micro-rasbora endemic to peninsular Thailand, suited to soft, acidic nano aquariums in large groups.
- Truncata Rasbora Care GuideTrigonostigma truncata is a harlequin rasbora described in 2020 from the east coast of the Malay Peninsula, distinguished by a truncated bla
- Red-hook Silver Dollar Care GuideMyloplus rubripinnis is a tall, peaceful schooling silver dollar from the Amazon and Orinoco with a bright red anal fin and a herbivorous di
- Silver Dollar (Metynnis) Care GuideMetynnis hypsauchen is a round, peaceful schooling characin from South America, a herbivorous relative of piranhas that readily eats aquariu
- Wimple Piranha Care GuideCatoprion mento is a small serrasalmid specialised as a scale-eater (lepidophage), with a distinctive underbite for stripping scales from ot
- Speckled Piranha Care GuideSerrasalmus spilopleura is a smaller South American piranha known for fin-biting behaviour and best kept as a solitary specimen.
- White Piranha Care GuideSerrasalmus rhombeus, the redeye piranha, is a solitary predator from the Amazon and Orinoco basins with one of the strongest bites among fi
- Piraya Piranha Care GuidePygocentrus piraya is the largest piranha species, endemic to the São Francisco River basin in Brazil and kept only in very large tanks.
- Black-spot Piranha (cariba) Care GuidePygocentrus cariba is a powerful Orinoco piranha with a black shoulder spot, a carnivorous schooling predator that requires a large tank and
- Worm-line Headstander Care GuideSynaptolaemus cingulatus is a rarely kept headstander from the upper Orinoco, Casiquiare and upper Xingu, swimming head-down and suited to s
- Frideric's Leporinus Care GuideLeporinus friderici is a large, widespread headstander with three dark blotches on a silvery body, feeding mainly on fruits, seeds and termi
- Banded Leporinus Care GuideLeporinus fasciatus is a large yellow-and-black banded headstander from the Amazon basin that becomes increasingly herbivorous and assertive
- Striped Headstander Care GuideAnostomus anostomus is a striped headstander from the Amazon and Orinoco basins that swims head-down and grazes on algae, plant matter and s
- Black-banded Copella Care GuideCopella nigrofasciata is a slender top-dwelling lebiasinid from northern South America, with a thin black lateral stripe; now treated as a s
- Nitidus Pencilfish Care GuideNannostomus nitidus is a small pencilfish from the Capim River basin of Pará, Brazil, with a thin dark lateral stripe and care typical of th
- Anduze's Pencilfish Care GuideNannostomus anduzei is among the smallest pencilfish, a roughly 16 mm nano characin from the upper Orinoco and Rio Negro tributaries.
- Two-striped Pencilfish Care GuideNannostomus bifasciatus is a slim pencilfish from the coastal rivers of Suriname and French Guiana, marked by two horizontal stripes.
- Ruby Red Pencilfish Care GuideNannostomus rubrocaudatus is a tiny Peruvian pencilfish with red-purple flanks and three black stripes, collected from the upper Marañón reg
- Harrison's Pencilfish Care GuideNannostomus harrisoni is a slim pencilfish endemic to the Demerara basin of Guyana, with reddish fins in males and a preference for soft, ac
- Tube-mouth Pencilfish Care GuideNannostomus unifasciatus is a slender oblique-swimming pencilfish with a single black lateral stripe, native to the upper Amazon and Orinoco
- Diptail Pencilfish Care GuideNannostomus eques is a small Amazonian pencilfish famous for its oblique, snout-up swimming posture and gentle, gregarious nature.
- Spotfin Hatchetfish Care GuideThoracocharax stellatus is the largest common freshwater hatchetfish, a wide-ranging South American surface insectivore marked by a dark spo
- Silver Hatchetfish Care GuideGasteropelecus levis is a freshwater hatchetfish from the lower Amazon basin, a surface-dwelling schooling species that needs a tightly cove
- Garnet Tetra Care GuideHemigrammus pulcher, the garnet or pretty tetra, is an easygoing characin from the upper Amazon near Iquitos with a copper sheen and a dark
- Blue Tetra (coeruleus) Care GuideHemigrammus coeruleus is a Rio Negro characin with a blue-green sheen and dark caudal markings, kept as a peaceful blackwater schooling fish
- January Tetra Care GuideHemigrammus hyanuary is a slim peaceful tetra from the Amazon basin with a blue-green lateral stripe, often used as a dither for dwarf cichl
- Featherfin Tetra (stictus) Care GuideHemigrammus stictus is a compact characin from the Amazon, Negro and Orinoco basins, kept as a peaceful schooling fish in soft, acidic water
- Buenos Aires Tetra Care GuideHemigrammus caudovittatus is a hardy, relatively large tetra from the Rio de la Plata basin, tolerant of cooler water but known to nibble so
- False Rummynose Tetra Care GuidePetitella georgiae, the false rummynose, is a slim red-headed characin from the Rio Purus and other basins, widely traded as a rummynose sub
- True Rummynose Tetra Care GuideHemigrammus bleheri, the firehead or rummynose tetra, is a tight-schooling characin from the Rio Negro and Orinoco basins with a vivid red h
- Albino Neon Tetra Care GuideThe Albino Neon Tetra is a selectively bred form of Paracheirodon innesi with reduced pigment that retains the species' blue stripe.
- Mato Grosso Tetra Care GuideHyphessobrycon sp. "Mato Grosso" is an undescribed tetra from the Mato Grosso region of Brazil, kept as a peaceful soft-water schooling fish
- Yellow Tetra (eos) Care GuideHyphessobrycon eos, the Dawn tetra, is a small characin recorded from the Guianas, kept as a peaceful schooling fish in soft tinted water.
- Weitzman's Tetra Care GuideHyphessobrycon weitzmani is a small South American characin kept as a peaceful schooling tetra for soft-water, blackwater-style nano aquariu
- Colombian Red Fin Tetra Care GuideHyphessobrycon columbianus is a robust Colombian tetra with a metallic blue back and red fins, an active schooler best kept in larger groups
- Purple Tetra Care GuideHyphessobrycon metae is a small tetra from the Orinoco basin, a peaceful schooler that suits soft, dimly lit Amazonian aquariums.