Home / Fishes / Tetras, piranhas and pacus / Marbled headstander
No federal permit to keepMarbled headstander
Abramites hypselonotus
Fishes › Tetras, piranhas and pacus (Characiformes) › Anostomidae (Headstanders)
Abramites hypselonotus – known as the marbled headstander or the high-backed headstander – is a member of the family Anostomidae of the order Characiformes.
Care at a glance
Species-specific aquarium care
- Tank: At least 36 in long and 12 in front to back for one adult (adults commonly reach about 5.5 in / 14 cm).
- Water: Freshwater.
- Temperature: 73–81°F (range recorded for this species).
- pH: 6–7.5.
- Hardness: 0–18 dGH.
- Layout: An open-water swimmer: needs long, open swimming space with few obstacles.
- Diet: A predator: feed meaty foods sized to its mouth (frozen fish, shrimp, worms); it will eat tankmates that fit in its mouth. FishBase classes it as a carnivore.
Calculated from this species' own FishBase record: tank size from its typical adult length and swimming zone, water values from its recorded ranges. The group guide below fills in general care.
Care guide
Species care notes
- Tank: a base of at least 47 × 12 in (roughly 29 US gallons); space needed is rated “large tank”.
- Water: a fairly wide range, from slightly acidic to slightly alkaline, 68–86 °F, pH 5.5–7.5, 1–15 dGH.
- Behaviour: kept alone; not a community fish.
- Difficulty: Easy (Seriously Fish rating).
Short excerpts from the species profile:
- Setup: “Not critical provided basic maintenance requirements are fulfilled although soft-leaved plants may be consumed.”
- Diet: “Anostomids are opportunistic omnivores feeding chiefly on benthic items including sponges, insect larvae, organic detritus, seeds, leaves and filamentous algae in nature.”
- Tankmates: “Best maintained as a group in a large tank alongside robust cichlids, characins and catfishes.”
- Breeding: “No recorded accounts of captive breeding exist.”
From the Seriously Fish profile for this species, which has the full habitat, maintenance, diet, behaviour and breeding write-up 167
Headstanders
Applies to most species in this group. Habitat: South American headstanders occupy rivers and floodplain waters, with Anostomus grazing rocky fast-flowing margins and Leporinus fasciatus using channels, tributaries, lakes and flooded forest. Individual species can differ, so compare with the species numbers above and the linked sources.
Housing & setup
- For Anostomus anostomus, at least 120 × 30 cm (48 × 12 in) is the smallest footprint to consider; groups need larger housing.
- For Leporinus fasciatus, provide at least a 210 × 60 cm (84 × 24 in) footprint.
- Fit a secure lid: anostomids are strong jumpers.
- Use sand, smooth rocks and roots or branches; preserve swimming room and expect plants to be eaten.
- Provide mature biological filtration and good oxygenation; Anostomus benefit from water movement and lighting supporting algal grazing.
Climate & lighting
| Water | 68–82°F |
Diet
- For Anostomus, algae wafers and algae growing on solid surfaces.
- Blanched spinach or lettuce, cucumber or courgette.
- Small live or frozen aquatic invertebrates within an omnivorous diet; adjust the plant-to-animal balance to the identified species.
Social life
- A. anostomus can be quarrelsome in small groups: keep one or at least six in a substantially larger tank. Choose robust, suitably sized companions rather than assuming peaceful tetra-like behavior.
Health watch
- Injuries from jumping or territorial aggression.
- Ammonia-related illness in immature aquaria.
- Nutritional deficiencies from an inappropriate diet.
Understanding the animal
About this animal
About this animal
Under normal fish classifying rules, the marbled headstander would be classified as a surface dweller. In reality, marbled headstanders – like all headstanders – inhabit the middle and lower portions of the aquarium.
Quoted from the Wikipedia article “Abramites hypselonotus” (CC BY-SA 4.0) 174
In the wild
In the wild
From this species’ own FishBase record (habitat, bottom type, water and breeding data), not its family. Good care copies these conditions.1
| Where it lives | Lives in freshwater, in rivers and streams. Adults feed on worms, crustaceans, insects and plant matter. |
| Water it lives in | Freshwater, 73–81 °F (23–27 °C), pH 6–7.5, hardness 18 dH. |
| Climate | Tropical climate. |
| Wild diet | Hunting macrofauna (predator). |
| Behavior to plan for | Breeding: nesters. |
What this means for care
- Keep water within its wild range, 73–81 °F.
Native climate (measured)
Native climate (measured)
| Warm-season highs | about 90°F (up to 93°F in the hottest sampled areas) |
| Cool-season lows | about 61°F (down to 50°F in the coldest sampled areas) |
| Average temperature | 70–80°F across sampled records |
| Relative humidity | 73–83% on average (driest month about 69%) |
| Rainfall | about 1778 mm a year |
Measured at 92 wild occurrence records sampled against WorldClim 2.1 climate data (1970–2000 averages). Air conditions in the range are ecological context, not enclosure settings: microhabitats such as burrows, leaf litter or basking rocks can be cooler, warmer or more humid.
From the sources
From the sources
Quoted from the matching sections of reputable sources for this exact species. Specialist databases are used first; Wikipedia (community-edited, CC BY-SA 4.0) only fills gaps. Other sources are short credited quotes.
| Overview | Abramites hypselonotus – known as the marbled headstander or the high-backed headstander – is a member of the family Anostomidae of the order Characiformes. Under normal fish classifying rules, the marbled headstander would be classified as a surface dweller. In reality, marbled headstanders – like all headstanders – inhabit the middle and lower portions of the aquarium. In the wild, headstanders are often found face down, tail up in narrow vertical rocky fissures. — Wikipedia (community-edited) |
| Where it lives | Home ranges Population dynamics Growth parameters Max. ages / sizes Length-weight rel. Length-frequencies Mass conversion Recruitment Abundance Life cycle Reproduction Maturity Maturity/Gills rel. — FishBase |
| Wild diet | The marble headstander is a predominantly herbivorous fish and as such should be given a high vegetation diet. In addition to processed food, it will readily accept (and probably enjoy) lettuce leaves, and peas. They will also accept mosquito larvae and bloodworms. — Wikipedia (community-edited) |
| Reproduction | Distinct pairs breed on densely grown weedy places. — FishBase |
| Appearance and size | Marble headstanders are generally identified by their high backs, pointed snout, diamond-shaped body, brown markings on pelvic fin, wavy dark brown bands, and a dark line at the base of the caudal peduncle. The marble headstander's full adult size is roughly 5 in, on both sides. They are among the rarely introduced representatives of the Anostomidae and the males are more contrasted than the females. — Wikipedia (community-edited) |
| Biology | Adults feed on worms, crustaceans, insects and plant matter. Distinct pairs breed on densely grown weedy places. — FishBase |
Data and studies
The numbers
The numbers
Each bar is what one source reports. Where several sources weigh in, the dashed gold band marks their average.
Adult length
Maximum recorded length. Measured as total length. Fish in home aquariums often stay smaller than wild records.
Water temperature
Range the species tolerates in nature; aim for the middle.
Water hardness
Minimum tank footprint
Seriously Fish recommends a tank base of at least 47 × 12 in (about 29 US gallons).
Veterinary & husbandry research
Veterinary & husbandry research
- The complete mitochondrial genome of Abramites hypselonotus (Günther, 1868) (Ostariophysi: Characiformes: Anostomidae): an aquarium headstander Lacerda-Chaves AK et al., Mitochondrial DNA. Part B, Resources 2021
Peer-reviewed papers that mention this species alongside captivity, zoos, veterinary care or aquaculture. Some cover several species or mention it only in passing, so check the abstract. 170
Sources for this sheet
- FishBase (Froese & Pauly, eds.), version 24.07 Peer-reviewed researchThe global scientific database on fishes, maintained by a consortium of research institutions; every value is referenced.
- Seriously Fish species profiles Experienced keeper or breederLong-running aquarium reference written and peer-checked by experienced fishkeepers and ichthyologists; each profile covers habitat, tank size, water, diet, behaviour and breeding.
- Seriously Fish — anostomus Experienced keeper or breederAdded in the 2026 source-checked care-guide review.
- Seriously Fish — leporinus fasciatus Experienced keeper or breederAdded in the 2026 source-checked care-guide review.
- Merck Veterinary Manual — Disorders and Diseases of Fish Zoo, university or veterinaryAdded in the 2026 source-checked care-guide review.
- Wikipedia (species article) Community referenceFree encyclopedia; useful overviews with their own citations. Intro text is quoted under CC BY-SA 4.0.
- PubMed (U.S. National Library of Medicine) Peer-reviewed researchIndex of peer-reviewed veterinary, zoo and husbandry research.
- iNaturalist (captive observations) Community referenceCommunity observation platform run by the California Academy of Sciences and National Geographic; observations marked captive show animals living in homes, zoos and aquariums.
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